Add http_error callback

Allows user code to display its own error status responses or just log
the errors. Is called even in cases where begin_request is not called.

mongoose.c

@@ -1,5183 +1,5186 @@
-// Copyright (c) 2004-2013 Sergey Lyubka
-//
-// Permission is hereby granted, free of charge, to any person obtaining a copy
-// of this software and associated documentation files (the "Software"), to deal
-// in the Software without restriction, including without limitation the rights
-// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
-// copies of the Software, and to permit persons to whom the Software is
-// furnished to do so, subject to the following conditions:
-//
-// The above copyright notice and this permission notice shall be included in
-// all copies or substantial portions of the Software.
-//
-// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
-// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
-// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
-// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
-// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
-// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
-// THE SOFTWARE.
-
-#if defined(_WIN32)
-#define _CRT_SECURE_NO_WARNINGS // Disable deprecation warning in VS2005
-#else
-#ifdef __linux__
-#define _XOPEN_SOURCE 600     // For flockfile() on Linux
-#endif
-#define _LARGEFILE_SOURCE     // Enable 64-bit file offsets
-#define __STDC_FORMAT_MACROS  // <inttypes.h> wants this for C++
-#define __STDC_LIMIT_MACROS   // C++ wants that for INT64_MAX
-#endif
-
-#if defined (_MSC_VER)
-// conditional expression is constant: introduced by FD_SET(..)
-#pragma warning (disable : 4127)
-// non-constant aggregate initializer: issued due to missing C99 support
-#pragma warning (disable : 4204)
-#endif
-
-// Disable WIN32_LEAN_AND_MEAN.
-// This makes windows.h always include winsock2.h
-#ifdef WIN32_LEAN_AND_MEAN
-#undef WIN32_LEAN_AND_MEAN
-#endif
-
-#if defined(__SYMBIAN32__)
-#define NO_SSL // SSL is not supported
-#define NO_CGI // CGI is not supported
-#define PATH_MAX FILENAME_MAX
-#endif // __SYMBIAN32__
-
-#ifndef _WIN32_WCE // Some ANSI #includes are not available on Windows CE
-#include <sys/types.h>
-#include <sys/stat.h>
-#include <errno.h>
-#include <signal.h>
-#include <fcntl.h>
-#endif // !_WIN32_WCE
-
-#include <time.h>
-#include <stdlib.h>
-#include <stdarg.h>
-#include <assert.h>
-#include <string.h>
-#include <ctype.h>
-#include <limits.h>
-#include <stddef.h>
-#include <stdio.h>
-
-#if defined(_WIN32) && !defined(__SYMBIAN32__) // Windows specific
-#define _WIN32_WINNT 0x0400 // To make it link in VS2005
-#include <windows.h>
-
-#ifndef PATH_MAX
-#define PATH_MAX MAX_PATH
-#endif
-
-#ifndef _WIN32_WCE
-#include <process.h>
-#include <direct.h>
-#include <io.h>
-#else // _WIN32_WCE
-#define NO_CGI // WinCE has no pipes
-
-typedef long off_t;
-
-#define errno   GetLastError()
-#define strerror(x)  _ultoa(x, (char *) _alloca(sizeof(x) *3 ), 10)
-#endif // _WIN32_WCE
-
-#define MAKEUQUAD(lo, hi) ((uint64_t)(((uint32_t)(lo)) | \
-      ((uint64_t)((uint32_t)(hi))) << 32))
-#define RATE_DIFF 10000000 // 100 nsecs
-#define EPOCH_DIFF MAKEUQUAD(0xd53e8000, 0x019db1de)
-#define SYS2UNIX_TIME(lo, hi) \
-  (time_t) ((MAKEUQUAD((lo), (hi)) - EPOCH_DIFF) / RATE_DIFF)
-
-// Visual Studio 6 does not know __func__ or __FUNCTION__
-// The rest of MS compilers use __FUNCTION__, not C99 __func__
-// Also use _strtoui64 on modern M$ compilers
-#if defined(_MSC_VER) && _MSC_VER < 1300
-#define STRX(x) #x
-#define STR(x) STRX(x)
-#define __func__ __FILE__ ":" STR(__LINE__)
-#define strtoull(x, y, z) strtoul(x, y, z)
-#define strtoll(x, y, z) strtol(x, y, z)
-#else
-#define __func__  __FUNCTION__
-#define strtoull(x, y, z) _strtoui64(x, y, z)
-#define strtoll(x, y, z) _strtoi64(x, y, z)
-#endif // _MSC_VER
-
-#define ERRNO   GetLastError()
-#define NO_SOCKLEN_T
-#define SSL_LIB   "ssleay32.dll"
-#define CRYPTO_LIB  "libeay32.dll"
-#define O_NONBLOCK  0
-#if !defined(EWOULDBLOCK)
-#define EWOULDBLOCK  WSAEWOULDBLOCK
-#endif // !EWOULDBLOCK
-#define _POSIX_
-#define INT64_FMT  "I64d"
-
-#define WINCDECL __cdecl
-#define SHUT_WR 1
-#define snprintf _snprintf
-#define vsnprintf _vsnprintf
-#define mg_sleep(x) Sleep(x)
-
-#define pipe(x) _pipe(x, MG_BUF_LEN, _O_BINARY)
-#define popen(x, y) _popen(x, y)
-#define pclose(x) _pclose(x)
-#define close(x) _close(x)
-#define dlsym(x,y) GetProcAddress((HINSTANCE) (x), (y))
-#define RTLD_LAZY  0
-#define fseeko(x, y, z) _lseeki64(_fileno(x), (y), (z))
-#define fdopen(x, y) _fdopen((x), (y))
-#define write(x, y, z) _write((x), (y), (unsigned) z)
-#define read(x, y, z) _read((x), (y), (unsigned) z)
-#define flockfile(x) EnterCriticalSection(&global_log_file_lock)
-#define funlockfile(x) LeaveCriticalSection(&global_log_file_lock)
-#define sleep(x) Sleep((x) * 1000)
-#define va_copy(x, y) x = y
-
-#if !defined(fileno)
-#define fileno(x) _fileno(x)
-#endif // !fileno MINGW #defines fileno
-
-typedef HANDLE pthread_mutex_t;
-typedef struct {HANDLE signal, broadcast;} pthread_cond_t;
-typedef DWORD pthread_t;
-#define pid_t HANDLE // MINGW typedefs pid_t to int. Using #define here.
-
-static int pthread_mutex_lock(pthread_mutex_t *);
-static int pthread_mutex_unlock(pthread_mutex_t *);
-static void to_unicode(const char *path, wchar_t *wbuf, size_t wbuf_len);
-struct file;
-static char *mg_fgets(char *buf, size_t size, struct file *filep, char **p);
-
-#if defined(HAVE_STDINT)
-#include <stdint.h>
-#else
-typedef unsigned int  uint32_t;
-typedef unsigned short  uint16_t;
-typedef unsigned __int64 uint64_t;
-typedef __int64   int64_t;
-#define INT64_MAX  9223372036854775807
-#endif // HAVE_STDINT
-
-// POSIX dirent interface
-struct dirent {
-  char d_name[PATH_MAX];
-};
-
-typedef struct DIR {
-  HANDLE   handle;
-  WIN32_FIND_DATAW info;
-  struct dirent  result;
-} DIR;
-
-#ifndef HAS_POLL
-struct pollfd {
-  int fd;
-  short events;
-  short revents;
-};
-#define POLLIN 1
-#endif
-
-
-// Mark required libraries
-#pragma comment(lib, "Ws2_32.lib")
-
-#else    // UNIX  specific
-#include <sys/wait.h>
-#include <sys/socket.h>
-#include <sys/poll.h>
-#include <netinet/in.h>
-#include <arpa/inet.h>
-#include <sys/time.h>
-#include <stdint.h>
-#include <inttypes.h>
-#include <netdb.h>
-
-#include <pwd.h>
-#include <unistd.h>
-#include <dirent.h>
-#if !defined(NO_SSL_DL) && !defined(NO_SSL)
-#include <dlfcn.h>
-#endif
-#include <pthread.h>
-#if defined(__MACH__)
-#define SSL_LIB   "libssl.dylib"
-#define CRYPTO_LIB  "libcrypto.dylib"
-#else
-#if !defined(SSL_LIB)
-#define SSL_LIB   "libssl.so"
-#endif
-#if !defined(CRYPTO_LIB)
-#define CRYPTO_LIB  "libcrypto.so"
-#endif
-#endif
-#ifndef O_BINARY
-#define O_BINARY  0
-#endif // O_BINARY
-#define closesocket(a) close(a)
-#define mg_mkdir(x, y) mkdir(x, y)
-#define mg_remove(x) remove(x)
-#define mg_rename(x, y) rename(x, y)
-#define mg_sleep(x) usleep((x) * 1000)
-#define ERRNO errno
-#define INVALID_SOCKET (-1)
-#define INT64_FMT PRId64
-typedef int SOCKET;
-#define WINCDECL
-
-#endif // End of Windows and UNIX specific includes
-
-#include "mongoose.h"
-
-#ifdef USE_LUA
-#include <lua.h>
-#include <lauxlib.h>
-#endif
-
-#define MONGOOSE_VERSION "3.8"
-#define PASSWORDS_FILE_NAME ".htpasswd"
-#define CGI_ENVIRONMENT_SIZE 4096
-#define MAX_CGI_ENVIR_VARS 64
-#define MG_BUF_LEN 8192
-#define MAX_REQUEST_SIZE 16384
-#define ARRAY_SIZE(array) (sizeof(array) / sizeof(array[0]))
-
-#ifdef _WIN32
-static CRITICAL_SECTION global_log_file_lock;
-static pthread_t pthread_self(void) {
-  return GetCurrentThreadId();
-}
-#endif // _WIN32
-
-#ifdef DEBUG_TRACE
-#undef DEBUG_TRACE
-#define DEBUG_TRACE(x)
-#else
-#if defined(DEBUG)
-#define DEBUG_TRACE(x) do { \
-  flockfile(stdout); \
-  printf("*** %lu.%p.%s.%d: ", \
-         (unsigned long) time(NULL), (void *) pthread_self(), \
-         __func__, __LINE__); \
-  printf x; \
-  putchar('\n'); \
-  fflush(stdout); \
-  funlockfile(stdout); \
-} while (0)
-#else
-#define DEBUG_TRACE(x)
-#endif // DEBUG
-#endif // DEBUG_TRACE
-
-// Darwin prior to 7.0 and Win32 do not have socklen_t
-#ifdef NO_SOCKLEN_T
-typedef int socklen_t;
-#endif // NO_SOCKLEN_T
-#define _DARWIN_UNLIMITED_SELECT
-
-#if !defined(MSG_NOSIGNAL)
-#define MSG_NOSIGNAL 0
-#endif
-
-#if !defined(SOMAXCONN)
-#define SOMAXCONN 100
-#endif
-
-#if !defined(PATH_MAX)
-#define PATH_MAX 4096
-#endif
-
-static const char *http_500_error = "Internal Server Error";
-
-#if defined(NO_SSL_DL)
-#include <openssl/ssl.h>
-#else
-// SSL loaded dynamically from DLL.
-// I put the prototypes here to be independent from OpenSSL source installation.
-typedef struct ssl_st SSL;
-typedef struct ssl_method_st SSL_METHOD;
-typedef struct ssl_ctx_st SSL_CTX;
-
-struct ssl_func {
-  const char *name;   // SSL function name
-  void  (*ptr)(void); // Function pointer
-};
-
-#define SSL_free (* (void (*)(SSL *)) ssl_sw[0].ptr)
-#define SSL_accept (* (int (*)(SSL *)) ssl_sw[1].ptr)
-#define SSL_connect (* (int (*)(SSL *)) ssl_sw[2].ptr)
-#define SSL_read (* (int (*)(SSL *, void *, int)) ssl_sw[3].ptr)
-#define SSL_write (* (int (*)(SSL *, const void *,int)) ssl_sw[4].ptr)
-#define SSL_get_error (* (int (*)(SSL *, int)) ssl_sw[5].ptr)
-#define SSL_set_fd (* (int (*)(SSL *, SOCKET)) ssl_sw[6].ptr)
-#define SSL_new (* (SSL * (*)(SSL_CTX *)) ssl_sw[7].ptr)
-#define SSL_CTX_new (* (SSL_CTX * (*)(SSL_METHOD *)) ssl_sw[8].ptr)
-#define SSLv23_server_method (* (SSL_METHOD * (*)(void)) ssl_sw[9].ptr)
-#define SSL_library_init (* (int (*)(void)) ssl_sw[10].ptr)
-#define SSL_CTX_use_PrivateKey_file (* (int (*)(SSL_CTX *, \
-        const char *, int)) ssl_sw[11].ptr)
-#define SSL_CTX_use_certificate_file (* (int (*)(SSL_CTX *, \
-        const char *, int)) ssl_sw[12].ptr)
-#define SSL_CTX_set_default_passwd_cb \
-  (* (void (*)(SSL_CTX *, mg_callback_t)) ssl_sw[13].ptr)
-#define SSL_CTX_free (* (void (*)(SSL_CTX *)) ssl_sw[14].ptr)
-#define SSL_load_error_strings (* (void (*)(void)) ssl_sw[15].ptr)
-#define SSL_CTX_use_certificate_chain_file \
-  (* (int (*)(SSL_CTX *, const char *)) ssl_sw[16].ptr)
-#define SSLv23_client_method (* (SSL_METHOD * (*)(void)) ssl_sw[17].ptr)
-#define SSL_pending (* (int (*)(SSL *)) ssl_sw[18].ptr)
-#define SSL_CTX_set_verify (* (void (*)(SSL_CTX *, int, int)) ssl_sw[19].ptr)
-
-#define CRYPTO_num_locks (* (int (*)(void)) crypto_sw[0].ptr)
-#define CRYPTO_set_locking_callback \
-  (* (void (*)(void (*)(int, int, const char *, int))) crypto_sw[1].ptr)
-#define CRYPTO_set_id_callback \
-  (* (void (*)(unsigned long (*)(void))) crypto_sw[2].ptr)
-#define ERR_get_error (* (unsigned long (*)(void)) crypto_sw[3].ptr)
-#define ERR_error_string (* (char * (*)(unsigned long,char *)) crypto_sw[4].ptr)
-
-// set_ssl_option() function updates this array.
-// It loads SSL library dynamically and changes NULLs to the actual addresses
-// of respective functions. The macros above (like SSL_connect()) are really
-// just calling these functions indirectly via the pointer.
-static struct ssl_func ssl_sw[] = {
-  {"SSL_free",   NULL},
-  {"SSL_accept",   NULL},
-  {"SSL_connect",   NULL},
-  {"SSL_read",   NULL},
-  {"SSL_write",   NULL},
-  {"SSL_get_error",  NULL},
-  {"SSL_set_fd",   NULL},
-  {"SSL_new",   NULL},
-  {"SSL_CTX_new",   NULL},
-  {"SSLv23_server_method", NULL},
-  {"SSL_library_init",  NULL},
-  {"SSL_CTX_use_PrivateKey_file", NULL},
-  {"SSL_CTX_use_certificate_file",NULL},
-  {"SSL_CTX_set_default_passwd_cb",NULL},
-  {"SSL_CTX_free",  NULL},
-  {"SSL_load_error_strings", NULL},
-  {"SSL_CTX_use_certificate_chain_file", NULL},
-  {"SSLv23_client_method", NULL},
-  {"SSL_pending", NULL},
-  {"SSL_CTX_set_verify", NULL},
-  {NULL,    NULL}
-};
-
-// Similar array as ssl_sw. These functions could be located in different lib.
-#if !defined(NO_SSL)
-static struct ssl_func crypto_sw[] = {
-  {"CRYPTO_num_locks",  NULL},
-  {"CRYPTO_set_locking_callback", NULL},
-  {"CRYPTO_set_id_callback", NULL},
-  {"ERR_get_error",  NULL},
-  {"ERR_error_string", NULL},
-  {NULL,    NULL}
-};
-#endif // NO_SSL
-#endif // NO_SSL_DL
-
-static const char *month_names[] = {
-  "Jan", "Feb", "Mar", "Apr", "May", "Jun",
-  "Jul", "Aug", "Sep", "Oct", "Nov", "Dec"
-};
-
-// Unified socket address. For IPv6 support, add IPv6 address structure
-// in the union u.
-union usa {
-  struct sockaddr sa;
-  struct sockaddr_in sin;
-#if defined(USE_IPV6)
-  struct sockaddr_in6 sin6;
-#endif
-};
-
-// Describes a string (chunk of memory).
-struct vec {
-  const char *ptr;
-  size_t len;
-};
-
-struct file {
-  int is_directory;
-  time_t modification_time;
-  int64_t size;
-  FILE *fp;
-  const char *membuf;   // Non-NULL if file data is in memory
-};
-#define STRUCT_FILE_INITIALIZER {0, 0, 0, NULL, NULL}
-
-// Describes listening socket, or socket which was accept()-ed by the master
-// thread and queued for future handling by the worker thread.
-struct socket {
-  SOCKET sock;          // Listening socket
-  union usa lsa;        // Local socket address
-  union usa rsa;        // Remote socket address
-  unsigned is_ssl:1;    // Is port SSL-ed
-  unsigned ssl_redir:1; // Is port supposed to redirect everything to SSL port
-};
-
-// NOTE(lsm): this enum shoulds be in sync with the config_options below.
-enum {
-  CGI_EXTENSIONS, CGI_ENVIRONMENT, PUT_DELETE_PASSWORDS_FILE, CGI_INTERPRETER,
-  PROTECT_URI, AUTHENTICATION_DOMAIN, SSI_EXTENSIONS, THROTTLE,
-  ACCESS_LOG_FILE, ENABLE_DIRECTORY_LISTING, ERROR_LOG_FILE,
-  GLOBAL_PASSWORDS_FILE, INDEX_FILES, ENABLE_KEEP_ALIVE, ACCESS_CONTROL_LIST,
-  EXTRA_MIME_TYPES, LISTENING_PORTS, DOCUMENT_ROOT, SSL_CERTIFICATE,
-  NUM_THREADS, RUN_AS_USER, REWRITE, HIDE_FILES, REQUEST_TIMEOUT,
-  NUM_OPTIONS
-};
-
-static const char *config_options[] = {
-  "C", "cgi_pattern", "**.cgi$|**.pl$|**.php$",
-  "E", "cgi_environment", NULL,
-  "G", "put_delete_auth_file", NULL,
-  "I", "cgi_interpreter", NULL,
-  "P", "protect_uri", NULL,
-  "R", "authentication_domain", "mydomain.com",
-  "S", "ssi_pattern", "**.shtml$|**.shtm$",
-  "T", "throttle", NULL,
-  "a", "access_log_file", NULL,
-  "d", "enable_directory_listing", "yes",
-  "e", "error_log_file", NULL,
-  "g", "global_auth_file", NULL,
-  "i", "index_files",
-        "index.html,index.htm,index.cgi,index.shtml,index.php,index.lp",
-  "k", "enable_keep_alive", "no",
-  "l", "access_control_list", NULL,
-  "m", "extra_mime_types", NULL,
-  "p", "listening_ports", "8080",
-  "r", "document_root",  ".",
-  "s", "ssl_certificate", NULL,
-  "t", "num_threads", "50",
-  "u", "run_as_user", NULL,
-  "w", "url_rewrite_patterns", NULL,
-  "x", "hide_files_patterns", NULL,
-  "z", "request_timeout_ms", "30000",
-  NULL
-};
-#define ENTRIES_PER_CONFIG_OPTION 3
-
-struct mg_context {
-  volatile int stop_flag;         // Should we stop event loop
-  SSL_CTX *ssl_ctx;               // SSL context
-  char *config[NUM_OPTIONS];      // Mongoose configuration parameters
-  struct mg_callbacks callbacks;  // User-defined callback function
-  void *user_data;                // User-defined data
-
-  struct socket *listening_sockets;
-  int num_listening_sockets;
-
-  volatile int num_threads;  // Number of threads
-  pthread_mutex_t mutex;     // Protects (max|num)_threads
-  pthread_cond_t  cond;      // Condvar for tracking workers terminations
-
-  struct socket queue[20];   // Accepted sockets
-  volatile int sq_head;      // Head of the socket queue
-  volatile int sq_tail;      // Tail of the socket queue
-  pthread_cond_t sq_full;    // Signaled when socket is produced
-  pthread_cond_t sq_empty;   // Signaled when socket is consumed
-};
-
-struct mg_connection {
-  struct mg_request_info request_info;
-  struct mg_context *ctx;
-  SSL *ssl;                   // SSL descriptor
-  SSL_CTX *client_ssl_ctx;    // SSL context for client connections
-  struct socket client;       // Connected client
-  time_t birth_time;          // Time when request was received
-  int64_t num_bytes_sent;     // Total bytes sent to client
-  int64_t content_len;        // Content-Length header value
-  int64_t consumed_content;   // How many bytes of content have been read
-  char *buf;                  // Buffer for received data
-  char *path_info;            // PATH_INFO part of the URL
-  int must_close;             // 1 if connection must be closed
-  int buf_size;               // Buffer size
-  int request_len;            // Size of the request + headers in a buffer
-  int data_len;               // Total size of data in a buffer
-  int status_code;            // HTTP reply status code, e.g. 200
-  int throttle;               // Throttling, bytes/sec. <= 0 means no throttle
-  time_t last_throttle_time;  // Last time throttled data was sent
-  int64_t last_throttle_bytes;// Bytes sent this second
-};
-
-const char **mg_get_valid_option_names(void) {
-  return config_options;
-}
-
-static int is_file_in_memory(struct mg_connection *conn, const char *path,
-                             struct file *filep) {
-  size_t size = 0;
-  if ((filep->membuf = conn->ctx->callbacks.open_file == NULL ? NULL :
-       conn->ctx->callbacks.open_file(conn, path, &size)) != NULL) {
-    // NOTE: override filep->size only on success. Otherwise, it might break
-    // constructs like if (!mg_stat() || !mg_fopen()) ...
-    filep->size = size;
-  }
-  return filep->membuf != NULL;
-}
-
-static int is_file_opened(const struct file *filep) {
-  return filep->membuf != NULL || filep->fp != NULL;
-}
-
-static int mg_fopen(struct mg_connection *conn, const char *path,
-                    const char *mode, struct file *filep) {
-  if (!is_file_in_memory(conn, path, filep)) {
-#ifdef _WIN32
-    wchar_t wbuf[PATH_MAX], wmode[20];
-    to_unicode(path, wbuf, ARRAY_SIZE(wbuf));
-    MultiByteToWideChar(CP_UTF8, 0, mode, -1, wmode, ARRAY_SIZE(wmode));
-    filep->fp = _wfopen(wbuf, wmode);
-#else
-    filep->fp = fopen(path, mode);
-#endif
-  }
-
-  return is_file_opened(filep);
-}
-
-static void mg_fclose(struct file *filep) {
-  if (filep != NULL && filep->fp != NULL) {
-    fclose(filep->fp);
-  }
-}
-
-static int get_option_index(const char *name) {
-  int i;
-
-  for (i = 0; config_options[i] != NULL; i += ENTRIES_PER_CONFIG_OPTION) {
-    if (strcmp(config_options[i], name) == 0 ||
-        strcmp(config_options[i + 1], name) == 0) {
-      return i / ENTRIES_PER_CONFIG_OPTION;
-    }
-  }
-  return -1;
-}
-
-const char *mg_get_option(const struct mg_context *ctx, const char *name) {
-  int i;
-  if ((i = get_option_index(name)) == -1) {
-    return NULL;
-  } else if (ctx->config[i] == NULL) {
-    return "";
-  } else {
-    return ctx->config[i];
-  }
-}
-
-static void sockaddr_to_string(char *buf, size_t len,
-                                     const union usa *usa) {
-  buf[0] = '\0';
-#if defined(USE_IPV6)
-  inet_ntop(usa->sa.sa_family, usa->sa.sa_family == AF_INET ?
-            (void *) &usa->sin.sin_addr :
-            (void *) &usa->sin6.sin6_addr, buf, len);
-#elif defined(_WIN32)
-  // Only Windoze Vista (and newer) have inet_ntop()
-  strncpy(buf, inet_ntoa(usa->sin.sin_addr), len);
-#else
-  inet_ntop(usa->sa.sa_family, (void *) &usa->sin.sin_addr, buf, len);
-#endif
-}
-
-static void cry(struct mg_connection *conn,
-                PRINTF_FORMAT_STRING(const char *fmt), ...) PRINTF_ARGS(2, 3);
-
-// Print error message to the opened error log stream.
-static void cry(struct mg_connection *conn, const char *fmt, ...) {
-  char buf[MG_BUF_LEN], src_addr[20];
-  va_list ap;
-  FILE *fp;
-  time_t timestamp;
-
-  va_start(ap, fmt);
-  (void) vsnprintf(buf, sizeof(buf), fmt, ap);
-  va_end(ap);
-
-  // Do not lock when getting the callback value, here and below.
-  // I suppose this is fine, since function cannot disappear in the
-  // same way string option can.
-  if (conn->ctx->callbacks.log_message == NULL ||
-      conn->ctx->callbacks.log_message(conn, buf) == 0) {
-    fp = conn->ctx == NULL || conn->ctx->config[ERROR_LOG_FILE] == NULL ? NULL :
-      fopen(conn->ctx->config[ERROR_LOG_FILE], "a+");
-
-    if (fp != NULL) {
-      flockfile(fp);
-      timestamp = time(NULL);
-
-      sockaddr_to_string(src_addr, sizeof(src_addr), &conn->client.rsa);
-      fprintf(fp, "[%010lu] [error] [client %s] ", (unsigned long) timestamp,
-              src_addr);
-
-      if (conn->request_info.request_method != NULL) {
-        fprintf(fp, "%s %s: ", conn->request_info.request_method,
-                conn->request_info.uri);
-      }
-
-      fprintf(fp, "%s", buf);
-      fputc('\n', fp);
-      funlockfile(fp);
-      fclose(fp);
-    }
-  }
-}
-
-// Return fake connection structure. Used for logging, if connection
-// is not applicable at the moment of logging.
-static struct mg_connection *fc(struct mg_context *ctx) {
-  static struct mg_connection fake_connection;
-  fake_connection.ctx = ctx;
-  return &fake_connection;
-}
-
-const char *mg_version(void) {
-  return MONGOOSE_VERSION;
-}
-
-struct mg_request_info *mg_get_request_info(struct mg_connection *conn) {
-  return &conn->request_info;
-}
-
-static void mg_strlcpy(register char *dst, register const char *src, size_t n) {
-  for (; *src != '\0' && n > 1; n--) {
-    *dst++ = *src++;
-  }
-  *dst = '\0';
-}
-
-static int lowercase(const char *s) {
-  return tolower(* (const unsigned char *) s);
-}
-
-static int mg_strncasecmp(const char *s1, const char *s2, size_t len) {
-  int diff = 0;
-
-  if (len > 0)
-    do {
-      diff = lowercase(s1++) - lowercase(s2++);
-    } while (diff == 0 && s1[-1] != '\0' && --len > 0);
-
-  return diff;
-}
-
-static int mg_strcasecmp(const char *s1, const char *s2) {
-  int diff;
-
-  do {
-    diff = lowercase(s1++) - lowercase(s2++);
-  } while (diff == 0 && s1[-1] != '\0');
-
-  return diff;
-}
-
-static char * mg_strndup(const char *ptr, size_t len) {
-  char *p;
-
-  if ((p = (char *) malloc(len + 1)) != NULL) {
-    mg_strlcpy(p, ptr, len + 1);
-  }
-
-  return p;
-}
-
-static char * mg_strdup(const char *str) {
-  return mg_strndup(str, strlen(str));
-}
-
-// Like snprintf(), but never returns negative value, or a value
-// that is larger than a supplied buffer.
-// Thanks to Adam Zeldis to pointing snprintf()-caused vulnerability
-// in his audit report.
-static int mg_vsnprintf(struct mg_connection *conn, char *buf, size_t buflen,
-                        const char *fmt, va_list ap) {
-  int n;
-
-  if (buflen == 0)
-    return 0;
-
-  n = vsnprintf(buf, buflen, fmt, ap);
-
-  if (n < 0) {
-    cry(conn, "vsnprintf error");
-    n = 0;
-  } else if (n >= (int) buflen) {
-    cry(conn, "truncating vsnprintf buffer: [%.*s]",
-        n > 200 ? 200 : n, buf);
-    n = (int) buflen - 1;
-  }
-  buf[n] = '\0';
-
-  return n;
-}
-
-static int mg_snprintf(struct mg_connection *conn, char *buf, size_t buflen,
-                       PRINTF_FORMAT_STRING(const char *fmt), ...)
-  PRINTF_ARGS(4, 5);
-
-static int mg_snprintf(struct mg_connection *conn, char *buf, size_t buflen,
-                       const char *fmt, ...) {
-  va_list ap;
-  int n;
-
-  va_start(ap, fmt);
-  n = mg_vsnprintf(conn, buf, buflen, fmt, ap);
-  va_end(ap);
-
-  return n;
-}
-
-// Skip the characters until one of the delimiters characters found.
-// 0-terminate resulting word. Skip the delimiter and following whitespaces.
-// Advance pointer to buffer to the next word. Return found 0-terminated word.
-// Delimiters can be quoted with quotechar.
-static char *skip_quoted(char **buf, const char *delimiters,
-                         const char *whitespace, char quotechar) {
-  char *p, *begin_word, *end_word, *end_whitespace;
-
-  begin_word = *buf;
-  end_word = begin_word + strcspn(begin_word, delimiters);
-
-  // Check for quotechar
-  if (end_word > begin_word) {
-    p = end_word - 1;
-    while (*p == quotechar) {
-      // If there is anything beyond end_word, copy it
-      if (*end_word == '\0') {
-        *p = '\0';
-        break;
-      } else {
-        size_t end_off = strcspn(end_word + 1, delimiters);
-        memmove (p, end_word, end_off + 1);
-        p += end_off; // p must correspond to end_word - 1
-        end_word += end_off + 1;
-      }
-    }
-    for (p++; p < end_word; p++) {
-      *p = '\0';
-    }
-  }
-
-  if (*end_word == '\0') {
-    *buf = end_word;
-  } else {
-    end_whitespace = end_word + 1 + strspn(end_word + 1, whitespace);
-
-    for (p = end_word; p < end_whitespace; p++) {
-      *p = '\0';
-    }
-
-    *buf = end_whitespace;
-  }
-
-  return begin_word;
-}
-
-// Simplified version of skip_quoted without quote char
-// and whitespace == delimiters
-static char *skip(char **buf, const char *delimiters) {
-  return skip_quoted(buf, delimiters, delimiters, 0);
-}
-
-
-// Return HTTP header value, or NULL if not found.
-static const char *get_header(const struct mg_request_info *ri,
-                              const char *name) {
-  int i;
-
-  for (i = 0; i < ri->num_headers; i++)
-    if (!mg_strcasecmp(name, ri->http_headers[i].name))
-      return ri->http_headers[i].value;
-
-  return NULL;
-}
-
-const char *mg_get_header(const struct mg_connection *conn, const char *name) {
-  return get_header(&conn->request_info, name);
-}
-
-// A helper function for traversing a comma separated list of values.
-// It returns a list pointer shifted to the next value, or NULL if the end
-// of the list found.
-// Value is stored in val vector. If value has form "x=y", then eq_val
-// vector is initialized to point to the "y" part, and val vector length
-// is adjusted to point only to "x".
-static const char *next_option(const char *list, struct vec *val,
-                               struct vec *eq_val) {
-  if (list == NULL || *list == '\0') {
-    // End of the list
-    list = NULL;
-  } else {
-    val->ptr = list;
-    if ((list = strchr(val->ptr, ',')) != NULL) {
-      // Comma found. Store length and shift the list ptr
-      val->len = list - val->ptr;
-      list++;
-    } else {
-      // This value is the last one
-      list = val->ptr + strlen(val->ptr);
-      val->len = list - val->ptr;
-    }
-
-    if (eq_val != NULL) {
-      // Value has form "x=y", adjust pointers and lengths
-      // so that val points to "x", and eq_val points to "y".
-      eq_val->len = 0;
-      eq_val->ptr = (const char *) memchr(val->ptr, '=', val->len);
-      if (eq_val->ptr != NULL) {
-        eq_val->ptr++;  // Skip over '=' character
-        eq_val->len = val->ptr + val->len - eq_val->ptr;
-        val->len = (eq_val->ptr - val->ptr) - 1;
-      }
-    }
-  }
-
-  return list;
-}
-
-static int match_prefix(const char *pattern, int pattern_len, const char *str) {
-  const char *or_str;
-  int i, j, len, res;
-
-  if ((or_str = (const char *) memchr(pattern, '|', pattern_len)) != NULL) {
-    res = match_prefix(pattern, or_str - pattern, str);
-    return res > 0 ? res :
-        match_prefix(or_str + 1, (pattern + pattern_len) - (or_str + 1), str);
-  }
-
-  i = j = 0;
-  res = -1;
-  for (; i < pattern_len; i++, j++) {
-    if (pattern[i] == '?' && str[j] != '\0') {
-      continue;
-    } else if (pattern[i] == '$') {
-      return str[j] == '\0' ? j : -1;
-    } else if (pattern[i] == '*') {
-      i++;
-      if (pattern[i] == '*') {
-        i++;
-        len = (int) strlen(str + j);
-      } else {
-        len = (int) strcspn(str + j, "/");
-      }
-      if (i == pattern_len) {
-        return j + len;
-      }
-      do {
-        res = match_prefix(pattern + i, pattern_len - i, str + j + len);
-      } while (res == -1 && len-- > 0);
-      return res == -1 ? -1 : j + res + len;
-    } else if (pattern[i] != str[j]) {
-      return -1;
-    }
-  }
-  return j;
-}
-
-// HTTP 1.1 assumes keep alive if "Connection:" header is not set
-// This function must tolerate situations when connection info is not
-// set up, for example if request parsing failed.
-static int should_keep_alive(const struct mg_connection *conn) {
-  const char *http_version = conn->request_info.http_version;
-  const char *header = mg_get_header(conn, "Connection");
-  if (conn->must_close ||
-      conn->status_code == 401 ||
-      mg_strcasecmp(conn->ctx->config[ENABLE_KEEP_ALIVE], "yes") != 0 ||
-      (header != NULL && mg_strcasecmp(header, "keep-alive") != 0) ||
-      (header == NULL && http_version && strcmp(http_version, "1.1"))) {
-    return 0;
-  }
-  return 1;
-}
-
-static const char *suggest_connection_header(const struct mg_connection *conn) {
-  return should_keep_alive(conn) ? "keep-alive" : "close";
-}
-
-static void send_http_error(struct mg_connection *, int, const char *,
-                            PRINTF_FORMAT_STRING(const char *fmt), ...)
-  PRINTF_ARGS(4, 5);
-
-
-static void send_http_error(struct mg_connection *conn, int status,
-                            const char *reason, const char *fmt, ...) {
-  char buf[MG_BUF_LEN];
-  va_list ap;
-  int len = 0;
-
-  conn->status_code = status;
-  buf[0] = '\0';
-
-  // Errors 1xx, 204 and 304 MUST NOT send a body
-  if (status > 199 && status != 204 && status != 304) {
-    len = mg_snprintf(conn, buf, sizeof(buf), "Error %d: %s", status, reason);
-    buf[len++] = '\n';
-
-    va_start(ap, fmt);
-    len += mg_vsnprintf(conn, buf + len, sizeof(buf) - len, fmt, ap);
-    va_end(ap);
-  }
-  DEBUG_TRACE(("[%s]", buf));
-
-  mg_printf(conn, "HTTP/1.1 %d %s\r\n"
-            "Content-Length: %d\r\n"
-            "Connection: %s\r\n\r\n", status, reason, len,
-            suggest_connection_header(conn));
-  conn->num_bytes_sent += mg_printf(conn, "%s", buf);
-}
-
-#if defined(_WIN32) && !defined(__SYMBIAN32__)
-static int pthread_mutex_init(pthread_mutex_t *mutex, void *unused) {
-  unused = NULL;
-  *mutex = CreateMutex(NULL, FALSE, NULL);
-  return *mutex == NULL ? -1 : 0;
-}
-
-static int pthread_mutex_destroy(pthread_mutex_t *mutex) {
-  return CloseHandle(*mutex) == 0 ? -1 : 0;
-}
-
-static int pthread_mutex_lock(pthread_mutex_t *mutex) {
-  return WaitForSingleObject(*mutex, INFINITE) == WAIT_OBJECT_0? 0 : -1;
-}
-
-static int pthread_mutex_unlock(pthread_mutex_t *mutex) {
-  return ReleaseMutex(*mutex) == 0 ? -1 : 0;
-}
-
-static int pthread_cond_init(pthread_cond_t *cv, const void *unused) {
-  unused = NULL;
-  cv->signal = CreateEvent(NULL, FALSE, FALSE, NULL);
-  cv->broadcast = CreateEvent(NULL, TRUE, FALSE, NULL);
-  return cv->signal != NULL && cv->broadcast != NULL ? 0 : -1;
-}
-
-static int pthread_cond_wait(pthread_cond_t *cv, pthread_mutex_t *mutex) {
-  HANDLE handles[] = {cv->signal, cv->broadcast};
-  ReleaseMutex(*mutex);
-  WaitForMultipleObjects(2, handles, FALSE, INFINITE);
-  return WaitForSingleObject(*mutex, INFINITE) == WAIT_OBJECT_0? 0 : -1;
-}
-
-static int pthread_cond_signal(pthread_cond_t *cv) {
-  return SetEvent(cv->signal) == 0 ? -1 : 0;
-}
-
-static int pthread_cond_broadcast(pthread_cond_t *cv) {
-  // Implementation with PulseEvent() has race condition, see
-  // http://www.cs.wustl.edu/~schmidt/win32-cv-1.html
-  return PulseEvent(cv->broadcast) == 0 ? -1 : 0;
-}
-
-static int pthread_cond_destroy(pthread_cond_t *cv) {
-  return CloseHandle(cv->signal) && CloseHandle(cv->broadcast) ? 0 : -1;
-}
-
-// For Windows, change all slashes to backslashes in path names.
-static void change_slashes_to_backslashes(char *path) {
-  int i;
-
-  for (i = 0; path[i] != '\0'; i++) {
-    if (path[i] == '/')
-      path[i] = '\\';
-    // i > 0 check is to preserve UNC paths, like \\server\file.txt
-    if (path[i] == '\\' && i > 0)
-      while (path[i + 1] == '\\' || path[i + 1] == '/')
-        (void) memmove(path + i + 1,
-            path + i + 2, strlen(path + i + 1));
-  }
-}
-
-// Encode 'path' which is assumed UTF-8 string, into UNICODE string.
-// wbuf and wbuf_len is a target buffer and its length.
-static void to_unicode(const char *path, wchar_t *wbuf, size_t wbuf_len) {
-  char buf[PATH_MAX], buf2[PATH_MAX], *p;
-
-  mg_strlcpy(buf, path, sizeof(buf));
-  change_slashes_to_backslashes(buf);
-
-  // Point p to the end of the file name
-  p = buf + strlen(buf) - 1;
-
-  // Convert to Unicode and back. If doubly-converted string does not
-  // match the original, something is fishy, reject.
-  memset(wbuf, 0, wbuf_len * sizeof(wchar_t));
-  MultiByteToWideChar(CP_UTF8, 0, buf, -1, wbuf, (int) wbuf_len);
-  WideCharToMultiByte(CP_UTF8, 0, wbuf, (int) wbuf_len, buf2, sizeof(buf2),
-                      NULL, NULL);
-  if (strcmp(buf, buf2) != 0) {
-    wbuf[0] = L'\0';
-  }
-}
-
-#if defined(_WIN32_WCE)
-static time_t time(time_t *ptime) {
-  time_t t;
-  SYSTEMTIME st;
-  FILETIME ft;
-
-  GetSystemTime(&st);
-  SystemTimeToFileTime(&st, &ft);
-  t = SYS2UNIX_TIME(ft.dwLowDateTime, ft.dwHighDateTime);
-
-  if (ptime != NULL) {
-    *ptime = t;
-  }
-
-  return t;
-}
-
-static struct tm *localtime(const time_t *ptime, struct tm *ptm) {
-  int64_t t = ((int64_t) *ptime) * RATE_DIFF + EPOCH_DIFF;
-  FILETIME ft, lft;
-  SYSTEMTIME st;
-  TIME_ZONE_INFORMATION tzinfo;
-
-  if (ptm == NULL) {
-    return NULL;
-  }
-
-  * (int64_t *) &ft = t;
-  FileTimeToLocalFileTime(&ft, &lft);
-  FileTimeToSystemTime(&lft, &st);
-  ptm->tm_year = st.wYear - 1900;
-  ptm->tm_mon = st.wMonth - 1;
-  ptm->tm_wday = st.wDayOfWeek;
-  ptm->tm_mday = st.wDay;
-  ptm->tm_hour = st.wHour;
-  ptm->tm_min = st.wMinute;
-  ptm->tm_sec = st.wSecond;
-  ptm->tm_yday = 0; // hope nobody uses this
-  ptm->tm_isdst =
-    GetTimeZoneInformation(&tzinfo) == TIME_ZONE_ID_DAYLIGHT ? 1 : 0;
-
-  return ptm;
-}
-
-static struct tm *gmtime(const time_t *ptime, struct tm *ptm) {
-  // FIXME(lsm): fix this.
-  return localtime(ptime, ptm);
-}
-
-static size_t strftime(char *dst, size_t dst_size, const char *fmt,
-                       const struct tm *tm) {
-  (void) snprintf(dst, dst_size, "implement strftime() for WinCE");
-  return 0;
-}
-#endif
-
-static int mg_rename(const char* oldname, const char* newname) {
-  wchar_t woldbuf[PATH_MAX];
-  wchar_t wnewbuf[PATH_MAX];
-
-  to_unicode(oldname, woldbuf, ARRAY_SIZE(woldbuf));
-  to_unicode(newname, wnewbuf, ARRAY_SIZE(wnewbuf));
-
-  return MoveFileW(woldbuf, wnewbuf) ? 0 : -1;
-}
-
-// Windows happily opens files with some garbage at the end of file name.
-// For example, fopen("a.cgi    ", "r") on Windows successfully opens
-// "a.cgi", despite one would expect an error back.
-// This function returns non-0 if path ends with some garbage.
-static int path_cannot_disclose_cgi(const char *path) {
-  static const char *allowed_last_characters = "_-";
-  int last = path[strlen(path) - 1];
-  return isalnum(last) || strchr(allowed_last_characters, last) != NULL;
-}
-
-static int mg_stat(struct mg_connection *conn, const char *path,
-                   struct file *filep) {
-  wchar_t wbuf[PATH_MAX];
-  WIN32_FILE_ATTRIBUTE_DATA info;
-
-  if (!is_file_in_memory(conn, path, filep)) {
-    to_unicode(path, wbuf, ARRAY_SIZE(wbuf));
-    if (GetFileAttributesExW(wbuf, GetFileExInfoStandard, &info) != 0) {
-      filep->size = MAKEUQUAD(info.nFileSizeLow, info.nFileSizeHigh);
-      filep->modification_time = SYS2UNIX_TIME(
-          info.ftLastWriteTime.dwLowDateTime,
-          info.ftLastWriteTime.dwHighDateTime);
-      filep->is_directory = info.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY;
-      // If file name is fishy, reset the file structure and return error.
-      // Note it is important to reset, not just return the error, cause
-      // functions like is_file_opened() check the struct.
-      if (!filep->is_directory && !path_cannot_disclose_cgi(path)) {
-        memset(filep, 0, sizeof(*filep));
-      }
-    }
-  }
-
-  return filep->membuf != NULL || filep->modification_time != 0;
-}
-
-static int mg_remove(const char *path) {
-  wchar_t wbuf[PATH_MAX];
-  to_unicode(path, wbuf, ARRAY_SIZE(wbuf));
-  return DeleteFileW(wbuf) ? 0 : -1;
-}
-
-static int mg_mkdir(const char *path, int mode) {
-  char buf[PATH_MAX];
-  wchar_t wbuf[PATH_MAX];
-
-  mode = 0; // Unused
-  mg_strlcpy(buf, path, sizeof(buf));
-  change_slashes_to_backslashes(buf);
-
-  (void) MultiByteToWideChar(CP_UTF8, 0, buf, -1, wbuf, ARRAY_SIZE(wbuf));
-
-  return CreateDirectoryW(wbuf, NULL) ? 0 : -1;
-}
-
-// Implementation of POSIX opendir/closedir/readdir for Windows.
-static DIR * opendir(const char *name) {
-  DIR *dir = NULL;
-  wchar_t wpath[PATH_MAX];
-  DWORD attrs;
-
-  if (name == NULL) {
-    SetLastError(ERROR_BAD_ARGUMENTS);
-  } else if ((dir = (DIR *) malloc(sizeof(*dir))) == NULL) {
-    SetLastError(ERROR_NOT_ENOUGH_MEMORY);
-  } else {
-    to_unicode(name, wpath, ARRAY_SIZE(wpath));
-    attrs = GetFileAttributesW(wpath);
-    if (attrs != 0xFFFFFFFF &&
-        ((attrs & FILE_ATTRIBUTE_DIRECTORY) == FILE_ATTRIBUTE_DIRECTORY)) {
-      (void) wcscat(wpath, L"\\*");
-      dir->handle = FindFirstFileW(wpath, &dir->info);
-      dir->result.d_name[0] = '\0';
-    } else {
-      free(dir);
-      dir = NULL;
-    }
-  }
-
-  return dir;
-}
-
-static int closedir(DIR *dir) {
-  int result = 0;
-
-  if (dir != NULL) {
-    if (dir->handle != INVALID_HANDLE_VALUE)
-      result = FindClose(dir->handle) ? 0 : -1;
-
-    free(dir);
-  } else {
-    result = -1;
-    SetLastError(ERROR_BAD_ARGUMENTS);
-  }
-
-  return result;
-}
-
-static struct dirent *readdir(DIR *dir) {
-  struct dirent *result = 0;
-
-  if (dir) {
-    if (dir->handle != INVALID_HANDLE_VALUE) {
-      result = &dir->result;
-      (void) WideCharToMultiByte(CP_UTF8, 0,
-          dir->info.cFileName, -1, result->d_name,
-          sizeof(result->d_name), NULL, NULL);
-
-      if (!FindNextFileW(dir->handle, &dir->info)) {
-        (void) FindClose(dir->handle);
-        dir->handle = INVALID_HANDLE_VALUE;
-      }
-
-    } else {
-      SetLastError(ERROR_FILE_NOT_FOUND);
-    }
-  } else {
-    SetLastError(ERROR_BAD_ARGUMENTS);
-  }
-
-  return result;
-}
-
-#ifndef HAVE_POLL
-static int poll(struct pollfd *pfd, int n, int milliseconds) {
-  struct timeval tv;
-  fd_set set;
-  int i, result;
-
-  tv.tv_sec = milliseconds / 1000;
-  tv.tv_usec = (milliseconds % 1000) * 1000;
-  FD_ZERO(&set);
-
-  for (i = 0; i < n; i++) {
-    FD_SET((SOCKET) pfd[i].fd, &set);
-    pfd[i].revents = 0;
-  }
-
-  if ((result = select(0, &set, NULL, NULL, &tv)) > 0) {
-    for (i = 0; i < n; i++) {
-      if (FD_ISSET(pfd[i].fd, &set)) {
-        pfd[i].revents = POLLIN;
-      }
-    }
-  }
-
-  return result;
-}
-#endif // HAVE_POLL
-
-#define set_close_on_exec(x) // No FD_CLOEXEC on Windows
-
-int mg_start_thread(mg_thread_func_t f, void *p) {
-  return _beginthread((void (__cdecl *)(void *)) f, 0, p) == -1L ? -1 : 0;
-}
-
-static HANDLE dlopen(const char *dll_name, int flags) {
-  wchar_t wbuf[PATH_MAX];
-  flags = 0; // Unused
-  to_unicode(dll_name, wbuf, ARRAY_SIZE(wbuf));
-  return LoadLibraryW(wbuf);
-}
-
-#if !defined(NO_CGI)
-#define SIGKILL 0
-static int kill(pid_t pid, int sig_num) {
-  (void) TerminateProcess(pid, sig_num);
-  (void) CloseHandle(pid);
-  return 0;
-}
-
-static void trim_trailing_whitespaces(char *s) {
-  char *e = s + strlen(s) - 1;
-  while (e > s && isspace(* (unsigned char *) e)) {
-    *e-- = '\0';
-  }
-}
-
-static pid_t spawn_process(struct mg_connection *conn, const char *prog,
-                           char *envblk, char *envp[], int fd_stdin,
-                           int fd_stdout, const char *dir) {
-  HANDLE me;
-  char *p, *interp, full_interp[PATH_MAX], full_dir[PATH_MAX],
-       cmdline[PATH_MAX], buf[PATH_MAX];
-  struct file file = STRUCT_FILE_INITIALIZER;
-  STARTUPINFOA si = { sizeof(si) };
-  PROCESS_INFORMATION pi = { 0 };
-
-  envp = NULL; // Unused
-
-  // TODO(lsm): redirect CGI errors to the error log file
-  si.dwFlags = STARTF_USESTDHANDLES | STARTF_USESHOWWINDOW;
-  si.wShowWindow = SW_HIDE;
-
-  me = GetCurrentProcess();
-  DuplicateHandle(me, (HANDLE) _get_osfhandle(fd_stdin), me,
-                  &si.hStdInput, 0, TRUE, DUPLICATE_SAME_ACCESS);
-  DuplicateHandle(me, (HANDLE) _get_osfhandle(fd_stdout), me,
-                  &si.hStdOutput, 0, TRUE, DUPLICATE_SAME_ACCESS);
-
-  // If CGI file is a script, try to read the interpreter line
-  interp = conn->ctx->config[CGI_INTERPRETER];
-  if (interp == NULL) {
-    buf[0] = buf[1] = '\0';
-
-    // Read the first line of the script into the buffer
-    snprintf(cmdline, sizeof(cmdline), "%s%c%s", dir, '/', prog);
-    if (mg_fopen(conn, cmdline, "r", &file)) {
-      p = (char *) file.membuf;
-      mg_fgets(buf, sizeof(buf), &file, &p);
-      mg_fclose(&file);
-      buf[sizeof(buf) - 1] = '\0';
-    }
-
-    if (buf[0] == '#' && buf[1] == '!') {
-      trim_trailing_whitespaces(buf + 2);
-    } else {
-      buf[2] = '\0';
-    }
-    interp = buf + 2;
-  }
-
-  if (interp[0] != '\0') {
-    GetFullPathNameA(interp, sizeof(full_interp), full_interp, NULL);
-    interp = full_interp;
-  }
-  GetFullPathNameA(dir, sizeof(full_dir), full_dir, NULL);
-
-  mg_snprintf(conn, cmdline, sizeof(cmdline), "%s%s%s\\%s",
-              interp, interp[0] == '\0' ? "" : " ", full_dir, prog);
-
-  DEBUG_TRACE(("Running [%s]", cmdline));
-  if (CreateProcessA(NULL, cmdline, NULL, NULL, TRUE,
-        CREATE_NEW_PROCESS_GROUP, envblk, NULL, &si, &pi) == 0) {
-    cry(conn, "%s: CreateProcess(%s): %d",
-        __func__, cmdline, ERRNO);
-    pi.hProcess = (pid_t) -1;
-  }
-
-  // Always close these to prevent handle leakage.
-  (void) close(fd_stdin);
-  (void) close(fd_stdout);
-
-  (void) CloseHandle(si.hStdOutput);
-  (void) CloseHandle(si.hStdInput);
-  (void) CloseHandle(pi.hThread);
-
-  return (pid_t) pi.hProcess;
-}
-#endif // !NO_CGI
-
-static int set_non_blocking_mode(SOCKET sock) {
-  unsigned long on = 1;
-  return ioctlsocket(sock, FIONBIO, &on);
-}
-
-#else
-static int mg_stat(struct mg_connection *conn, const char *path,
-                   struct file *filep) {
-  struct stat st;
-
-  if (!is_file_in_memory(conn, path, filep) && !stat(path, &st)) {
-    filep->size = st.st_size;
-    filep->modification_time = st.st_mtime;
-    filep->is_directory = S_ISDIR(st.st_mode);
-  } else {
-    filep->modification_time = (time_t) 0;
-  }
-
-  return filep->membuf != NULL || filep->modification_time != (time_t) 0;
-}
-
-static void set_close_on_exec(int fd) {
-  fcntl(fd, F_SETFD, FD_CLOEXEC);
-}
-
-int mg_start_thread(mg_thread_func_t func, void *param) {
-  pthread_t thread_id;
-  pthread_attr_t attr;
-
-  (void) pthread_attr_init(&attr);
-  (void) pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED);
-  // TODO(lsm): figure out why mongoose dies on Linux if next line is enabled
-  // (void) pthread_attr_setstacksize(&attr, sizeof(struct mg_connection) * 5);
-
-  return pthread_create(&thread_id, &attr, func, param);
-}
-
-#ifndef NO_CGI
-static pid_t spawn_process(struct mg_connection *conn, const char *prog,
-                           char *envblk, char *envp[], int fd_stdin,
-                           int fd_stdout, const char *dir) {
-  pid_t pid;
-  const char *interp;
-
-  (void) envblk;
-
-  if ((pid = fork()) == -1) {
-    // Parent
-    send_http_error(conn, 500, http_500_error, "fork(): %s", strerror(ERRNO));
-  } else if (pid == 0) {
-    // Child
-    if (chdir(dir) != 0) {
-      cry(conn, "%s: chdir(%s): %s", __func__, dir, strerror(ERRNO));
-    } else if (dup2(fd_stdin, 0) == -1) {
-      cry(conn, "%s: dup2(%d, 0): %s", __func__, fd_stdin, strerror(ERRNO));
-    } else if (dup2(fd_stdout, 1) == -1) {
-      cry(conn, "%s: dup2(%d, 1): %s", __func__, fd_stdout, strerror(ERRNO));
-    } else {
-      (void) dup2(fd_stdout, 2);
-      (void) close(fd_stdin);
-      (void) close(fd_stdout);
-
-      // After exec, all signal handlers are restored to their default values,
-      // with one exception of SIGCHLD. According to POSIX.1-2001 and Linux's
-      // implementation, SIGCHLD's handler will leave unchanged after exec
-      // if it was set to be ignored. Restore it to default action.
-      signal(SIGCHLD, SIG_DFL);
-
-      interp = conn->ctx->config[CGI_INTERPRETER];
-      if (interp == NULL) {
-        (void) execle(prog, prog, NULL, envp);
-        cry(conn, "%s: execle(%s): %s", __func__, prog, strerror(ERRNO));
-      } else {
-        (void) execle(interp, interp, prog, NULL, envp);
-        cry(conn, "%s: execle(%s %s): %s", __func__, interp, prog,
-            strerror(ERRNO));
-      }
-    }
-    exit(EXIT_FAILURE);
-  }
-
-  // Parent. Close stdio descriptors
-  (void) close(fd_stdin);
-  (void) close(fd_stdout);
-
-  return pid;
-}
-#endif // !NO_CGI
-
-static int set_non_blocking_mode(SOCKET sock) {
-  int flags;
-
-  flags = fcntl(sock, F_GETFL, 0);
-  (void) fcntl(sock, F_SETFL, flags | O_NONBLOCK);
-
-  return 0;
-}
-#endif // _WIN32
-
-// Write data to the IO channel - opened file descriptor, socket or SSL
-// descriptor. Return number of bytes written.
-static int64_t push(FILE *fp, SOCKET sock, SSL *ssl, const char *buf,
-                    int64_t len) {
-  int64_t sent;
-  int n, k;
-
-  sent = 0;
-  while (sent < len) {
-
-    // How many bytes we send in this iteration
-    k = len - sent > INT_MAX ? INT_MAX : (int) (len - sent);
-
-#ifndef NO_SSL
-    if (ssl != NULL) {
-      n = SSL_write(ssl, buf + sent, k);
-    } else
-#endif
-      if (fp != NULL) {
-      n = (int) fwrite(buf + sent, 1, (size_t) k, fp);
-      if (ferror(fp))
-        n = -1;
-    } else {
-      n = send(sock, buf + sent, (size_t) k, MSG_NOSIGNAL);
-    }
-
-    if (n <= 0)
-      break;
-
-    sent += n;
-  }
-
-  return sent;
-}
-
-// Read from IO channel - opened file descriptor, socket, or SSL descriptor.
-// Return negative value on error, or number of bytes read on success.
-static int pull(FILE *fp, struct mg_connection *conn, char *buf, int len) {
-  int nread;
-
-  if (fp != NULL) {
-    // Use read() instead of fread(), because if we're reading from the CGI
-    // pipe, fread() may block until IO buffer is filled up. We cannot afford
-    // to block and must pass all read bytes immediately to the client.
-    nread = read(fileno(fp), buf, (size_t) len);
-#ifndef NO_SSL
-  } else if (conn->ssl != NULL) {
-    nread = SSL_read(conn->ssl, buf, len);
-#endif
-  } else {
-    nread = recv(conn->client.sock, buf, (size_t) len, 0);
-  }
-
-  return conn->ctx->stop_flag ? -1 : nread;
-}
-
-int mg_read(struct mg_connection *conn, void *buf, size_t len) {
-  int n, buffered_len, nread;
-  const char *body;
-
-  nread = 0;
-  if (conn->consumed_content < conn->content_len) {
-    // Adjust number of bytes to read.
-    int64_t to_read = conn->content_len - conn->consumed_content;
-    if (to_read < (int64_t) len) {
-      len = (size_t) to_read;
-    }
-
-    // Return buffered data
-    body = conn->buf + conn->request_len + conn->consumed_content;
-    buffered_len = &conn->buf[conn->data_len] - body;
-    if (buffered_len > 0) {
-      if (len < (size_t) buffered_len) {
-        buffered_len = (int) len;
-      }
-      memcpy(buf, body, (size_t) buffered_len);
-      len -= buffered_len;
-      conn->consumed_content += buffered_len;
-      nread += buffered_len;
-      buf = (char *) buf + buffered_len;
-    }
-
-    // We have returned all buffered data. Read new data from the remote socket.
-    while (len > 0) {
-      n = pull(NULL, conn, (char *) buf, (int) len);
-      if (n < 0) {
-        nread = n;  // Propagate the error
-        break;
-      } else if (n == 0) {
-        break;  // No more data to read
-      } else {
-        buf = (char *) buf + n;
-        conn->consumed_content += n;
-        nread += n;
-        len -= n;
-      }
-    }
-  }
-  return nread;
-}
-
-int mg_write(struct mg_connection *conn, const void *buf, size_t len) {
-  time_t now;
-  int64_t n, total, allowed;
-
-  if (conn->throttle > 0) {
-    if ((now = time(NULL)) != conn->last_throttle_time) {
-      conn->last_throttle_time = now;
-      conn->last_throttle_bytes = 0;
-    }
-    allowed = conn->throttle - conn->last_throttle_bytes;
-    if (allowed > (int64_t) len) {
-      allowed = len;
-    }
-    if ((total = push(NULL, conn->client.sock, conn->ssl, (const char *) buf,
-                      (int64_t) allowed)) == allowed) {
-      buf = (char *) buf + total;
-      conn->last_throttle_bytes += total;
-      while (total < (int64_t) len && conn->ctx->stop_flag == 0) {
-        allowed = conn->throttle > (int64_t) len - total ?
-          (int64_t) len - total : conn->throttle;
-        if ((n = push(NULL, conn->client.sock, conn->ssl, (const char *) buf,
-                      (int64_t) allowed)) != allowed) {
-          break;
-        }
-        sleep(1);
-        conn->last_throttle_bytes = allowed;
-        conn->last_throttle_time = time(NULL);
-        buf = (char *) buf + n;
-        total += n;
-      }
-    }
-  } else {
-    total = push(NULL, conn->client.sock, conn->ssl, (const char *) buf,
-                 (int64_t) len);
-  }
-  return (int) total;
-}
-
-// Print message to buffer. If buffer is large enough to hold the message,
-// return buffer. If buffer is to small, allocate large enough buffer on heap,
-// and return allocated buffer.
-static int alloc_vprintf(char **buf, size_t size, const char *fmt, va_list ap) {
-  va_list ap_copy;
-  int len;
-
-  // Windows is not standard-compliant, and vsnprintf() returns -1 if
-  // buffer is too small. Also, older versions of msvcrt.dll do not have
-  // _vscprintf().  However, if size is 0, vsnprintf() behaves correctly.
-  // Therefore, we make two passes: on first pass, get required message length.
-  // On second pass, actually print the message.
-  va_copy(ap_copy, ap);
-  len = vsnprintf(NULL, 0, fmt, ap_copy);
-
-  if (len > (int) size &&
-      (size = len + 1) > 0 &&
-      (*buf = (char *) malloc(size)) == NULL) {
-    len = -1;  // Allocation failed, mark failure
-  } else {
-    va_copy(ap_copy, ap);
-    vsnprintf(*buf, size, fmt, ap_copy);
-  }
-
-  return len;
-}
-
-int mg_vprintf(struct mg_connection *conn, const char *fmt, va_list ap) {
-  char mem[MG_BUF_LEN], *buf = mem;
-  int len;
-
-  if ((len = alloc_vprintf(&buf, sizeof(mem), fmt, ap)) > 0) {
-    len = mg_write(conn, buf, (size_t) len);
-  }
-  if (buf != mem && buf != NULL) {
-    free(buf);
-  }
-
-  return len;
-}
-
-int mg_printf(struct mg_connection *conn, const char *fmt, ...) {
-  va_list ap;
-  va_start(ap, fmt);
-  return mg_vprintf(conn, fmt, ap);
-}
-
-// URL-decode input buffer into destination buffer.
-// 0-terminate the destination buffer. Return the length of decoded data.
-// form-url-encoded data differs from URI encoding in a way that it
-// uses '+' as character for space, see RFC 1866 section 8.2.1
-// http://ftp.ics.uci.edu/pub/ietf/html/rfc1866.txt
-static int url_decode(const char *src, int src_len, char *dst,
-                      int dst_len, int is_form_url_encoded) {
-  int i, j, a, b;
-#define HEXTOI(x) (isdigit(x) ? x - '0' : x - 'W')
-
-  for (i = j = 0; i < src_len && j < dst_len - 1; i++, j++) {
-    if (src[i] == '%' &&
-        isxdigit(* (const unsigned char *) (src + i + 1)) &&
-        isxdigit(* (const unsigned char *) (src + i + 2))) {
-      a = tolower(* (const unsigned char *) (src + i + 1));
-      b = tolower(* (const unsigned char *) (src + i + 2));
-      dst[j] = (char) ((HEXTOI(a) << 4) | HEXTOI(b));
-      i += 2;
-    } else if (is_form_url_encoded && src[i] == '+') {
-      dst[j] = ' ';
-    } else {
-      dst[j] = src[i];
-    }
-  }
-
-  dst[j] = '\0'; // Null-terminate the destination
-
-  return i >= src_len ? j : -1;
-}
-
-int mg_get_var(const char *data, size_t data_len, const char *name,
-               char *dst, size_t dst_len) {
-  const char *p, *e, *s;
-  size_t name_len;
-  int len;
-
-  if (dst == NULL || dst_len == 0) {
-    len = -2;
-  } else if (data == NULL || name == NULL || data_len == 0) {
-    len = -1;
-    dst[0] = '\0';
-  } else {
-    name_len = strlen(name);
-    e = data + data_len;
-    len = -1;
-    dst[0] = '\0';
-
-    // data is "var1=val1&var2=val2...". Find variable first
-    for (p = data; p + name_len < e; p++) {
-      if ((p == data || p[-1] == '&') && p[name_len] == '=' &&
-          !mg_strncasecmp(name, p, name_len)) {
-
-        // Point p to variable value
-        p += name_len + 1;
-
-        // Point s to the end of the value
-        s = (const char *) memchr(p, '&', (size_t)(e - p));
-        if (s == NULL) {
-          s = e;
-        }
-        assert(s >= p);
-
-        // Decode variable into destination buffer
-        len = url_decode(p, (size_t)(s - p), dst, dst_len, 1);
-
-        // Redirect error code from -1 to -2 (destination buffer too small).
-        if (len == -1) {
-          len = -2;
-        }
-        break;
-      }
-    }
-  }
-
-  return len;
-}
-
-int mg_get_cookie(const struct mg_connection *conn, const char *cookie_name,
-                  char *dst, size_t dst_size) {
-  const char *s, *p, *end;
-  int name_len, len = -1;
-
-  if (dst == NULL || dst_size == 0) {
-    len = -2;
-  } else if (cookie_name == NULL ||
-             (s = mg_get_header(conn, "Cookie")) == NULL) {
-    len = -1;
-    dst[0] = '\0';
-  } else {
-    name_len = (int) strlen(cookie_name);
-    end = s + strlen(s);
-    dst[0] = '\0';
-
-    for (; (s = strstr(s, cookie_name)) != NULL; s += name_len) {
-      if (s[name_len] == '=') {
-        s += name_len + 1;
-        if ((p = strchr(s, ' ')) == NULL)
-          p = end;
-        if (p[-1] == ';')
-          p--;
-        if (*s == '"' && p[-1] == '"' && p > s + 1) {
-          s++;
-          p--;
-        }
-        if ((size_t) (p - s) < dst_size) {
-          len = p - s;
-          mg_strlcpy(dst, s, (size_t) len + 1);
-        } else {
-          len = -2;
-        }
-        break;
-      }
-    }
-  }
-  return len;
-}
-
-static void convert_uri_to_file_name(struct mg_connection *conn, char *buf,
-                                     size_t buf_len, struct file *filep) {
-  struct vec a, b;
-  const char *rewrite, *uri = conn->request_info.uri;
-  char *p;
-  int match_len;
-
-  // Using buf_len - 1 because memmove() for PATH_INFO may shift part
-  // of the path one byte on the right.
-  mg_snprintf(conn, buf, buf_len - 1, "%s%s", conn->ctx->config[DOCUMENT_ROOT],
-              uri);
-
-  rewrite = conn->ctx->config[REWRITE];
-  while ((rewrite = next_option(rewrite, &a, &b)) != NULL) {
-    if ((match_len = match_prefix(a.ptr, a.len, uri)) > 0) {
-      mg_snprintf(conn, buf, buf_len - 1, "%.*s%s", (int) b.len, b.ptr,
-                  uri + match_len);
-      break;
-    }
-  }
-
-  if (!mg_stat(conn, buf, filep)) {
-    // Support PATH_INFO for CGI scripts.
-    for (p = buf + strlen(buf); p > buf + 1; p--) {
-      if (*p == '/') {
-        *p = '\0';
-        if (match_prefix(conn->ctx->config[CGI_EXTENSIONS],
-                         strlen(conn->ctx->config[CGI_EXTENSIONS]), buf) > 0 &&
-            mg_stat(conn, buf, filep)) {
-          // Shift PATH_INFO block one character right, e.g.
-          //  "/x.cgi/foo/bar\x00" => "/x.cgi\x00/foo/bar\x00"
-          // conn->path_info is pointing to the local variable "path" declared
-          // in handle_request(), so PATH_INFO is not valid after
-          // handle_request returns.
-          conn->path_info = p + 1;
-          memmove(p + 2, p + 1, strlen(p + 1) + 1);  // +1 is for trailing \0
-          p[1] = '/';
-          break;
-        } else {
-          *p = '/';
-        }
-      }
-    }
-  }
-}
-
-// Check whether full request is buffered. Return:
-//   -1  if request is malformed
-//    0  if request is not yet fully buffered
-//   >0  actual request length, including last \r\n\r\n
-static int get_request_len(const char *buf, int buflen) {
-  const char *s, *e;
-  int len = 0;
-
-  for (s = buf, e = s + buflen - 1; len <= 0 && s < e; s++)
-    // Control characters are not allowed but >=128 is.
-    if (!isprint(* (const unsigned char *) s) && *s != '\r' &&
-        *s != '\n' && * (const unsigned char *) s < 128) {
-      len = -1;
-      break;  // [i_a] abort scan as soon as one malformed character is found;
-              // don't let subsequent \r\n\r\n win us over anyhow
-    } else if (s[0] == '\n' && s[1] == '\n') {
-      len = (int) (s - buf) + 2;
-    } else if (s[0] == '\n' && &s[1] < e &&
-        s[1] == '\r' && s[2] == '\n') {
-      len = (int) (s - buf) + 3;
-    }
-
-  return len;
-}
-
-// Convert month to the month number. Return -1 on error, or month number
-static int get_month_index(const char *s) {
-  size_t i;
-
-  for (i = 0; i < ARRAY_SIZE(month_names); i++)
-    if (!strcmp(s, month_names[i]))
-      return (int) i;
-
-  return -1;
-}
-
-static int num_leap_years(int year) {
-  return year / 4 - year / 100 + year / 400;
-}
-
-// Parse UTC date-time string, and return the corresponding time_t value.
-static time_t parse_date_string(const char *datetime) {
-  static const unsigned short days_before_month[] = {
-    0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334
-  };
-  char month_str[32];
-  int second, minute, hour, day, month, year, leap_days, days;
-  time_t result = (time_t) 0;
-
-  if (((sscanf(datetime, "%d/%3s/%d %d:%d:%d",
-               &day, month_str, &year, &hour, &minute, &second) == 6) ||
-       (sscanf(datetime, "%d %3s %d %d:%d:%d",
-               &day, month_str, &year, &hour, &minute, &second) == 6) ||
-       (sscanf(datetime, "%*3s, %d %3s %d %d:%d:%d",
-               &day, month_str, &year, &hour, &minute, &second) == 6) ||
-       (sscanf(datetime, "%d-%3s-%d %d:%d:%d",
-               &day, month_str, &year, &hour, &minute, &second) == 6)) &&
-      year > 1970 &&
-      (month = get_month_index(month_str)) != -1) {
-    leap_days = num_leap_years(year) - num_leap_years(1970);
-    year -= 1970;
-    days = year * 365 + days_before_month[month] + (day - 1) + leap_days;
-    result = days * 24 * 3600 + hour * 3600 + minute * 60 + second;
-  }
-
-  return result;
-}
-
-// Protect against directory disclosure attack by removing '..',
-// excessive '/' and '\' characters
-static void remove_double_dots_and_double_slashes(char *s) {
-  char *p = s;
-
-  while (*s != '\0') {
-    *p++ = *s++;
-    if (s[-1] == '/' || s[-1] == '\\') {
-      // Skip all following slashes, backslashes and double-dots
-      while (s[0] != '\0') {
-        if (s[0] == '/' || s[0] == '\\') {
-          s++;
-        } else if (s[0] == '.' && s[1] == '.') {
-          s += 2;
-        } else {
-          break;
-        }
-      }
-    }
-  }
-  *p = '\0';
-}
-
-static const struct {
-  const char *extension;
-  size_t ext_len;
-  const char *mime_type;
-} builtin_mime_types[] = {
-  {".html", 5, "text/html"},
-  {".htm", 4, "text/html"},
-  {".shtm", 5, "text/html"},
-  {".shtml", 6, "text/html"},
-  {".css", 4, "text/css"},
-  {".js",  3, "application/x-javascript"},
-  {".ico", 4, "image/x-icon"},
-  {".gif", 4, "image/gif"},
-  {".jpg", 4, "image/jpeg"},
-  {".jpeg", 5, "image/jpeg"},
-  {".png", 4, "image/png"},
-  {".svg", 4, "image/svg+xml"},
-  {".txt", 4, "text/plain"},
-  {".torrent", 8, "application/x-bittorrent"},
-  {".wav", 4, "audio/x-wav"},
-  {".mp3", 4, "audio/x-mp3"},
-  {".mid", 4, "audio/mid"},
-  {".m3u", 4, "audio/x-mpegurl"},
-  {".ogg", 4, "audio/ogg"},
-  {".ram", 4, "audio/x-pn-realaudio"},
-  {".xml", 4, "text/xml"},
-  {".json",  5, "text/json"},
-  {".xslt", 5, "application/xml"},
-  {".xsl", 4, "application/xml"},
-  {".ra",  3, "audio/x-pn-realaudio"},
-  {".doc", 4, "application/msword"},
-  {".exe", 4, "application/octet-stream"},
-  {".zip", 4, "application/x-zip-compressed"},
-  {".xls", 4, "application/excel"},
-  {".tgz", 4, "application/x-tar-gz"},
-  {".tar", 4, "application/x-tar"},
-  {".gz",  3, "application/x-gunzip"},
-  {".arj", 4, "application/x-arj-compressed"},
-  {".rar", 4, "application/x-arj-compressed"},
-  {".rtf", 4, "application/rtf"},
-  {".pdf", 4, "application/pdf"},
-  {".swf", 4, "application/x-shockwave-flash"},
-  {".mpg", 4, "video/mpeg"},
-  {".webm", 5, "video/webm"},
-  {".mpeg", 5, "video/mpeg"},
-  {".mp4", 4, "video/mp4"},
-  {".m4v", 4, "video/x-m4v"},
-  {".asf", 4, "video/x-ms-asf"},
-  {".avi", 4, "video/x-msvideo"},
-  {".bmp", 4, "image/bmp"},
-  {NULL,  0, NULL}
-};
-
-const char *mg_get_builtin_mime_type(const char *path) {
-  const char *ext;
-  size_t i, path_len;
-
-  path_len = strlen(path);
-
-  for (i = 0; builtin_mime_types[i].extension != NULL; i++) {
-    ext = path + (path_len - builtin_mime_types[i].ext_len);
-    if (path_len > builtin_mime_types[i].ext_len &&
-        mg_strcasecmp(ext, builtin_mime_types[i].extension) == 0) {
-      return builtin_mime_types[i].mime_type;
-    }
-  }
-
-  return "text/plain";
-}
-
-// Look at the "path" extension and figure what mime type it has.
-// Store mime type in the vector.
-static void get_mime_type(struct mg_context *ctx, const char *path,
-                          struct vec *vec) {
-  struct vec ext_vec, mime_vec;
-  const char *list, *ext;
-  size_t path_len;
-
-  path_len = strlen(path);
-
-  // Scan user-defined mime types first, in case user wants to
-  // override default mime types.
-  list = ctx->config[EXTRA_MIME_TYPES];
-  while ((list = next_option(list, &ext_vec, &mime_vec)) != NULL) {
-    // ext now points to the path suffix
-    ext = path + path_len - ext_vec.len;
-    if (mg_strncasecmp(ext, ext_vec.ptr, ext_vec.len) == 0) {
-      *vec = mime_vec;
-      return;
-    }
-  }
-
-  vec->ptr = mg_get_builtin_mime_type(path);
-  vec->len = strlen(vec->ptr);
-}
-
-static int is_big_endian(void) {
-  static const int n = 1;
-  return ((char *) &n)[0] == 0;
-}
-
-#ifndef HAVE_MD5
-typedef struct MD5Context {
-  uint32_t buf[4];
-  uint32_t bits[2];
-  unsigned char in[64];
-} MD5_CTX;
-
-static void byteReverse(unsigned char *buf, unsigned longs) {
-  uint32_t t;
-
-  // Forrest: MD5 expect LITTLE_ENDIAN, swap if BIG_ENDIAN
-  if (is_big_endian()) {
-    do {
-      t = (uint32_t) ((unsigned) buf[3] << 8 | buf[2]) << 16 |
-        ((unsigned) buf[1] << 8 | buf[0]);
-      * (uint32_t *) buf = t;
-      buf += 4;
-    } while (--longs);
-  }
-}
-
-#define F1(x, y, z) (z ^ (x & (y ^ z)))
-#define F2(x, y, z) F1(z, x, y)
-#define F3(x, y, z) (x ^ y ^ z)
-#define F4(x, y, z) (y ^ (x | ~z))
-
-#define MD5STEP(f, w, x, y, z, data, s) \
-  ( w += f(x, y, z) + data,  w = w<<s | w>>(32-s),  w += x )
-
-// Start MD5 accumulation.  Set bit count to 0 and buffer to mysterious
-// initialization constants.
-static void MD5Init(MD5_CTX *ctx) {
-  ctx->buf[0] = 0x67452301;
-  ctx->buf[1] = 0xefcdab89;
-  ctx->buf[2] = 0x98badcfe;
-  ctx->buf[3] = 0x10325476;
-
-  ctx->bits[0] = 0;
-  ctx->bits[1] = 0;
-}
-
-static void MD5Transform(uint32_t buf[4], uint32_t const in[16]) {
-  register uint32_t a, b, c, d;
-
-  a = buf[0];
-  b = buf[1];
-  c = buf[2];
-  d = buf[3];
-
-  MD5STEP(F1, a, b, c, d, in[0] + 0xd76aa478, 7);
-  MD5STEP(F1, d, a, b, c, in[1] + 0xe8c7b756, 12);
-  MD5STEP(F1, c, d, a, b, in[2] + 0x242070db, 17);
-  MD5STEP(F1, b, c, d, a, in[3] + 0xc1bdceee, 22);
-  MD5STEP(F1, a, b, c, d, in[4] + 0xf57c0faf, 7);
-  MD5STEP(F1, d, a, b, c, in[5] + 0x4787c62a, 12);
-  MD5STEP(F1, c, d, a, b, in[6] + 0xa8304613, 17);
-  MD5STEP(F1, b, c, d, a, in[7] + 0xfd469501, 22);
-  MD5STEP(F1, a, b, c, d, in[8] + 0x698098d8, 7);
-  MD5STEP(F1, d, a, b, c, in[9] + 0x8b44f7af, 12);
-  MD5STEP(F1, c, d, a, b, in[10] + 0xffff5bb1, 17);
-  MD5STEP(F1, b, c, d, a, in[11] + 0x895cd7be, 22);
-  MD5STEP(F1, a, b, c, d, in[12] + 0x6b901122, 7);
-  MD5STEP(F1, d, a, b, c, in[13] + 0xfd987193, 12);
-  MD5STEP(F1, c, d, a, b, in[14] + 0xa679438e, 17);
-  MD5STEP(F1, b, c, d, a, in[15] + 0x49b40821, 22);
-
-  MD5STEP(F2, a, b, c, d, in[1] + 0xf61e2562, 5);
-  MD5STEP(F2, d, a, b, c, in[6] + 0xc040b340, 9);
-  MD5STEP(F2, c, d, a, b, in[11] + 0x265e5a51, 14);
-  MD5STEP(F2, b, c, d, a, in[0] + 0xe9b6c7aa, 20);
-  MD5STEP(F2, a, b, c, d, in[5] + 0xd62f105d, 5);
-  MD5STEP(F2, d, a, b, c, in[10] + 0x02441453, 9);
-  MD5STEP(F2, c, d, a, b, in[15] + 0xd8a1e681, 14);
-  MD5STEP(F2, b, c, d, a, in[4] + 0xe7d3fbc8, 20);
-  MD5STEP(F2, a, b, c, d, in[9] + 0x21e1cde6, 5);
-  MD5STEP(F2, d, a, b, c, in[14] + 0xc33707d6, 9);
-  MD5STEP(F2, c, d, a, b, in[3] + 0xf4d50d87, 14);
-  MD5STEP(F2, b, c, d, a, in[8] + 0x455a14ed, 20);
-  MD5STEP(F2, a, b, c, d, in[13] + 0xa9e3e905, 5);
-  MD5STEP(F2, d, a, b, c, in[2] + 0xfcefa3f8, 9);
-  MD5STEP(F2, c, d, a, b, in[7] + 0x676f02d9, 14);
-  MD5STEP(F2, b, c, d, a, in[12] + 0x8d2a4c8a, 20);
-
-  MD5STEP(F3, a, b, c, d, in[5] + 0xfffa3942, 4);
-  MD5STEP(F3, d, a, b, c, in[8] + 0x8771f681, 11);
-  MD5STEP(F3, c, d, a, b, in[11] + 0x6d9d6122, 16);
-  MD5STEP(F3, b, c, d, a, in[14] + 0xfde5380c, 23);
-  MD5STEP(F3, a, b, c, d, in[1] + 0xa4beea44, 4);
-  MD5STEP(F3, d, a, b, c, in[4] + 0x4bdecfa9, 11);
-  MD5STEP(F3, c, d, a, b, in[7] + 0xf6bb4b60, 16);
-  MD5STEP(F3, b, c, d, a, in[10] + 0xbebfbc70, 23);
-  MD5STEP(F3, a, b, c, d, in[13] + 0x289b7ec6, 4);
-  MD5STEP(F3, d, a, b, c, in[0] + 0xeaa127fa, 11);
-  MD5STEP(F3, c, d, a, b, in[3] + 0xd4ef3085, 16);
-  MD5STEP(F3, b, c, d, a, in[6] + 0x04881d05, 23);
-  MD5STEP(F3, a, b, c, d, in[9] + 0xd9d4d039, 4);
-  MD5STEP(F3, d, a, b, c, in[12] + 0xe6db99e5, 11);
-  MD5STEP(F3, c, d, a, b, in[15] + 0x1fa27cf8, 16);
-  MD5STEP(F3, b, c, d, a, in[2] + 0xc4ac5665, 23);
-
-  MD5STEP(F4, a, b, c, d, in[0] + 0xf4292244, 6);
-  MD5STEP(F4, d, a, b, c, in[7] + 0x432aff97, 10);
-  MD5STEP(F4, c, d, a, b, in[14] + 0xab9423a7, 15);
-  MD5STEP(F4, b, c, d, a, in[5] + 0xfc93a039, 21);
-  MD5STEP(F4, a, b, c, d, in[12] + 0x655b59c3, 6);
-  MD5STEP(F4, d, a, b, c, in[3] + 0x8f0ccc92, 10);
-  MD5STEP(F4, c, d, a, b, in[10] + 0xffeff47d, 15);
-  MD5STEP(F4, b, c, d, a, in[1] + 0x85845dd1, 21);
-  MD5STEP(F4, a, b, c, d, in[8] + 0x6fa87e4f, 6);
-  MD5STEP(F4, d, a, b, c, in[15] + 0xfe2ce6e0, 10);
-  MD5STEP(F4, c, d, a, b, in[6] + 0xa3014314, 15);
-  MD5STEP(F4, b, c, d, a, in[13] + 0x4e0811a1, 21);
-  MD5STEP(F4, a, b, c, d, in[4] + 0xf7537e82, 6);
-  MD5STEP(F4, d, a, b, c, in[11] + 0xbd3af235, 10);
-  MD5STEP(F4, c, d, a, b, in[2] + 0x2ad7d2bb, 15);
-  MD5STEP(F4, b, c, d, a, in[9] + 0xeb86d391, 21);
-
-  buf[0] += a;
-  buf[1] += b;
-  buf[2] += c;
-  buf[3] += d;
-}
-
-static void MD5Update(MD5_CTX *ctx, unsigned char const *buf, unsigned len) {
-  uint32_t t;
-
-  t = ctx->bits[0];
-  if ((ctx->bits[0] = t + ((uint32_t) len << 3)) < t)
-    ctx->bits[1]++;
-  ctx->bits[1] += len >> 29;
-
-  t = (t >> 3) & 0x3f;
-
-  if (t) {
-    unsigned char *p = (unsigned char *) ctx->in + t;
-
-    t = 64 - t;
-    if (len < t) {
-      memcpy(p, buf, len);
-      return;
-    }
-    memcpy(p, buf, t);
-    byteReverse(ctx->in, 16);
-    MD5Transform(ctx->buf, (uint32_t *) ctx->in);
-    buf += t;
-    len -= t;
-  }
-
-  while (len >= 64) {
-    memcpy(ctx->in, buf, 64);
-    byteReverse(ctx->in, 16);
-    MD5Transform(ctx->buf, (uint32_t *) ctx->in);
-    buf += 64;
-    len -= 64;
-  }
-
-  memcpy(ctx->in, buf, len);
-}
-
-static void MD5Final(unsigned char digest[16], MD5_CTX *ctx) {
-  unsigned count;
-  unsigned char *p;
-
-  count = (ctx->bits[0] >> 3) & 0x3F;
-
-  p = ctx->in + count;
-  *p++ = 0x80;
-  count = 64 - 1 - count;
-  if (count < 8) {
-    memset(p, 0, count);
-    byteReverse(ctx->in, 16);
-    MD5Transform(ctx->buf, (uint32_t *) ctx->in);
-    memset(ctx->in, 0, 56);
-  } else {
-    memset(p, 0, count - 8);
-  }
-  byteReverse(ctx->in, 14);
-
-  ((uint32_t *) ctx->in)[14] = ctx->bits[0];
-  ((uint32_t *) ctx->in)[15] = ctx->bits[1];
-
-  MD5Transform(ctx->buf, (uint32_t *) ctx->in);
-  byteReverse((unsigned char *) ctx->buf, 4);
-  memcpy(digest, ctx->buf, 16);
-  memset((char *) ctx, 0, sizeof(*ctx));
-}
-#endif // !HAVE_MD5
-
-// Stringify binary data. Output buffer must be twice as big as input,
-// because each byte takes 2 bytes in string representation
-static void bin2str(char *to, const unsigned char *p, size_t len) {
-  static const char *hex = "0123456789abcdef";
-
-  for (; len--; p++) {
-    *to++ = hex[p[0] >> 4];
-    *to++ = hex[p[0] & 0x0f];
-  }
-  *to = '\0';
-}
-
-// Return stringified MD5 hash for list of strings. Buffer must be 33 bytes.
-void mg_md5(char buf[33], ...) {
-  unsigned char hash[16];
-  const char *p;
-  va_list ap;
-  MD5_CTX ctx;
-
-  MD5Init(&ctx);
-
-  va_start(ap, buf);
-  while ((p = va_arg(ap, const char *)) != NULL) {
-    MD5Update(&ctx, (const unsigned char *) p, (unsigned) strlen(p));
-  }
-  va_end(ap);
-
-  MD5Final(hash, &ctx);
-  bin2str(buf, hash, sizeof(hash));
-}
-
-// Check the user's password, return 1 if OK
-static int check_password(const char *method, const char *ha1, const char *uri,
-                          const char *nonce, const char *nc, const char *cnonce,
-                          const char *qop, const char *response) {
-  char ha2[32 + 1], expected_response[32 + 1];
-
-  // Some of the parameters may be NULL
-  if (method == NULL || nonce == NULL || nc == NULL || cnonce == NULL ||
-      qop == NULL || response == NULL) {
-    return 0;
-  }
-
-  // NOTE(lsm): due to a bug in MSIE, we do not compare the URI
-  // TODO(lsm): check for authentication timeout
-  if (// strcmp(dig->uri, c->ouri) != 0 ||
-      strlen(response) != 32
-      // || now - strtoul(dig->nonce, NULL, 10) > 3600
-      ) {
-    return 0;
-  }
-
-  mg_md5(ha2, method, ":", uri, NULL);
-  mg_md5(expected_response, ha1, ":", nonce, ":", nc,
-      ":", cnonce, ":", qop, ":", ha2, NULL);
-
-  return mg_strcasecmp(response, expected_response) == 0;
-}
-
-// Use the global passwords file, if specified by auth_gpass option,
-// or search for .htpasswd in the requested directory.
-static void open_auth_file(struct mg_connection *conn, const char *path,
-                           struct file *filep) {
-  char name[PATH_MAX];
-  const char *p, *e, *gpass = conn->ctx->config[GLOBAL_PASSWORDS_FILE];
-
-  if (gpass != NULL) {
-    // Use global passwords file
-    if (!mg_fopen(conn, gpass, "r", filep)) {
-      cry(conn, "fopen(%s): %s", gpass, strerror(ERRNO));
-    }
-  } else if (mg_stat(conn, path, filep) && filep->is_directory) {
-    mg_snprintf(conn, name, sizeof(name), "%s%c%s",
-                path, '/', PASSWORDS_FILE_NAME);
-    mg_fopen(conn, name, "r", filep);
-  } else {
-     // Try to find .htpasswd in requested directory.
-    for (p = path, e = p + strlen(p) - 1; e > p; e--)
-      if (e[0] == '/')
-        break;
-    mg_snprintf(conn, name, sizeof(name), "%.*s%c%s",
-                (int) (e - p), p, '/', PASSWORDS_FILE_NAME);
-    mg_fopen(conn, name, "r", filep);
-  }
-}
-
-// Parsed Authorization header
-struct ah {
-  char *user, *uri, *cnonce, *response, *qop, *nc, *nonce;
-};
-
-// Return 1 on success. Always initializes the ah structure.
-static int parse_auth_header(struct mg_connection *conn, char *buf,
-                             size_t buf_size, struct ah *ah) {
-  char *name, *value, *s;
-  const char *auth_header;
-
-  (void) memset(ah, 0, sizeof(*ah));
-  if ((auth_header = mg_get_header(conn, "Authorization")) == NULL ||
-      mg_strncasecmp(auth_header, "Digest ", 7) != 0) {
-    return 0;
-  }
-
-  // Make modifiable copy of the auth header
-  (void) mg_strlcpy(buf, auth_header + 7, buf_size);
-  s = buf;
-
-  // Parse authorization header
-  for (;;) {
-    // Gobble initial spaces
-    while (isspace(* (unsigned char *) s)) {
-      s++;
-    }
-    name = skip_quoted(&s, "=", " ", 0);
-    // Value is either quote-delimited, or ends at first comma or space.
-    if (s[0] == '\"') {
-      s++;
-      value = skip_quoted(&s, "\"", " ", '\\');
-      if (s[0] == ',') {
-        s++;
-      }
-    } else {
-      value = skip_quoted(&s, ", ", " ", 0);  // IE uses commas, FF uses spaces
-    }
-    if (*name == '\0') {
-      break;
-    }
-
-    if (!strcmp(name, "username")) {
-      ah->user = value;
-    } else if (!strcmp(name, "cnonce")) {
-      ah->cnonce = value;
-    } else if (!strcmp(name, "response")) {
-      ah->response = value;
-    } else if (!strcmp(name, "uri")) {
-      ah->uri = value;
-    } else if (!strcmp(name, "qop")) {
-      ah->qop = value;
-    } else if (!strcmp(name, "nc")) {
-      ah->nc = value;
-    } else if (!strcmp(name, "nonce")) {
-      ah->nonce = value;
-    }
-  }
-
-  // CGI needs it as REMOTE_USER
-  if (ah->user != NULL) {
-    conn->request_info.remote_user = mg_strdup(ah->user);
-  } else {
-    return 0;
-  }
-
-  return 1;
-}
-
-static char *mg_fgets(char *buf, size_t size, struct file *filep, char **p) {
-  char *eof;
-  size_t len;
-
-  if (filep->membuf != NULL && *p != NULL) {
-    eof = memchr(*p, '\n', &filep->membuf[filep->size] - *p);
-    len = (size_t) (eof - *p) > size - 1 ? size - 1 : (size_t) (eof - *p);
-    memcpy(buf, *p, len);
-    buf[len] = '\0';
-    *p = eof;
-    return eof;
-  } else if (filep->fp != NULL) {
-    return fgets(buf, size, filep->fp);
-  } else {
-    return NULL;
-  }
-}
-
-// Authorize against the opened passwords file. Return 1 if authorized.
-static int authorize(struct mg_connection *conn, struct file *filep) {
-  struct ah ah;
-  char line[256], f_user[256], ha1[256], f_domain[256], buf[MG_BUF_LEN], *p;
-
-  if (!parse_auth_header(conn, buf, sizeof(buf), &ah)) {
-    return 0;
-  }
-
-  // Loop over passwords file
-  p = (char *) filep->membuf;
-  while (mg_fgets(line, sizeof(line), filep, &p) != NULL) {
-    if (sscanf(line, "%[^:]:%[^:]:%s", f_user, f_domain, ha1) != 3) {
-      continue;
-    }
-
-    if (!strcmp(ah.user, f_user) &&
-        !strcmp(conn->ctx->config[AUTHENTICATION_DOMAIN], f_domain))
-      return check_password(conn->request_info.request_method, ha1, ah.uri,
-                            ah.nonce, ah.nc, ah.cnonce, ah.qop, ah.response);
-  }
-
-  return 0;
-}
-
-// Return 1 if request is authorised, 0 otherwise.
-static int check_authorization(struct mg_connection *conn, const char *path) {
-  char fname[PATH_MAX];
-  struct vec uri_vec, filename_vec;
-  const char *list;
-  struct file file = STRUCT_FILE_INITIALIZER;
-  int authorized = 1;
-
-  list = conn->ctx->config[PROTECT_URI];
-  while ((list = next_option(list, &uri_vec, &filename_vec)) != NULL) {
-    if (!memcmp(conn->request_info.uri, uri_vec.ptr, uri_vec.len)) {
-      mg_snprintf(conn, fname, sizeof(fname), "%.*s",
-                  (int) filename_vec.len, filename_vec.ptr);
-      if (!mg_fopen(conn, fname, "r", &file)) {
-        cry(conn, "%s: cannot open %s: %s", __func__, fname, strerror(errno));
-      }
-      break;
-    }
-  }
-
-  if (!is_file_opened(&file)) {
-    open_auth_file(conn, path, &file);
-  }
-
-  if (is_file_opened(&file)) {
-    authorized = authorize(conn, &file);
-    mg_fclose(&file);
-  }
-
-  return authorized;
-}
-
-static void send_authorization_request(struct mg_connection *conn) {
-  conn->status_code = 401;
-  mg_printf(conn,
-            "HTTP/1.1 401 Unauthorized\r\n"
-            "Content-Length: 0\r\n"
-            "WWW-Authenticate: Digest qop=\"auth\", "
-            "realm=\"%s\", nonce=\"%lu\"\r\n\r\n",
-            conn->ctx->config[AUTHENTICATION_DOMAIN],
-            (unsigned long) time(NULL));
-}
-
-static int is_authorized_for_put(struct mg_connection *conn) {
-  struct file file = STRUCT_FILE_INITIALIZER;
-  const char *passfile = conn->ctx->config[PUT_DELETE_PASSWORDS_FILE];
-  int ret = 0;
-
-  if (passfile != NULL && mg_fopen(conn, passfile, "r", &file)) {
-    ret = authorize(conn, &file);
-    mg_fclose(&file);
-  }
-
-  return ret;
-}
-
-int mg_modify_passwords_file(const char *fname, const char *domain,
-                             const char *user, const char *pass) {
-  int found;
-  char line[512], u[512], d[512], ha1[33], tmp[PATH_MAX];
-  FILE *fp, *fp2;
-
-  found = 0;
-  fp = fp2 = NULL;
-
-  // Regard empty password as no password - remove user record.
-  if (pass != NULL && pass[0] == '\0') {
-    pass = NULL;
-  }
-
-  (void) snprintf(tmp, sizeof(tmp), "%s.tmp", fname);
-
-  // Create the file if does not exist
-  if ((fp = fopen(fname, "a+")) != NULL) {
-    (void) fclose(fp);
-  }
-
-  // Open the given file and temporary file
-  if ((fp = fopen(fname, "r")) == NULL) {
-    return 0;
-  } else if ((fp2 = fopen(tmp, "w+")) == NULL) {
-    fclose(fp);
-    return 0;
-  }
-
-  // Copy the stuff to temporary file
-  while (fgets(line, sizeof(line), fp) != NULL) {
-    if (sscanf(line, "%[^:]:%[^:]:%*s", u, d) != 2) {
-      continue;
-    }
-
-    if (!strcmp(u, user) && !strcmp(d, domain)) {
-      found++;
-      if (pass != NULL) {
-        mg_md5(ha1, user, ":", domain, ":", pass, NULL);
-        fprintf(fp2, "%s:%s:%s\n", user, domain, ha1);
-      }
-    } else {
-      fprintf(fp2, "%s", line);
-    }
-  }
-
-  // If new user, just add it
-  if (!found && pass != NULL) {
-    mg_md5(ha1, user, ":", domain, ":", pass, NULL);
-    fprintf(fp2, "%s:%s:%s\n", user, domain, ha1);
-  }
-
-  // Close files
-  fclose(fp);
-  fclose(fp2);
-
-  // Put the temp file in place of real file
-  remove(fname);
-  rename(tmp, fname);
-
-  return 1;
-}
-
-struct de {
-  struct mg_connection *conn;
-  char *file_name;
-  struct file file;
-};
-
-static void url_encode(const char *src, char *dst, size_t dst_len) {
-  static const char *dont_escape = "._-$,;~()";
-  static const char *hex = "0123456789abcdef";
-  const char *end = dst + dst_len - 1;
-
-  for (; *src != '\0' && dst < end; src++, dst++) {
-    if (isalnum(*(const unsigned char *) src) ||
-        strchr(dont_escape, * (const unsigned char *) src) != NULL) {
-      *dst = *src;
-    } else if (dst + 2 < end) {
-      dst[0] = '%';
-      dst[1] = hex[(* (const unsigned char *) src) >> 4];
-      dst[2] = hex[(* (const unsigned char *) src) & 0xf];
-      dst += 2;
-    }
-  }
-
-  *dst = '\0';
-}
-
-static void print_dir_entry(struct de *de) {
-  char size[64], mod[64], href[PATH_MAX];
-
-  if (de->file.is_directory) {
-    mg_snprintf(de->conn, size, sizeof(size), "%s", "[DIRECTORY]");
-  } else {
-     // We use (signed) cast below because MSVC 6 compiler cannot
-     // convert unsigned __int64 to double. Sigh.
-    if (de->file.size < 1024) {
-      mg_snprintf(de->conn, size, sizeof(size), "%d", (int) de->file.size);
-    } else if (de->file.size < 0x100000) {
-      mg_snprintf(de->conn, size, sizeof(size),
-                  "%.1fk", (double) de->file.size / 1024.0);
-    } else if (de->file.size < 0x40000000) {
-      mg_snprintf(de->conn, size, sizeof(size),
-                  "%.1fM", (double) de->file.size / 1048576);
-    } else {
-      mg_snprintf(de->conn, size, sizeof(size),
-                  "%.1fG", (double) de->file.size / 1073741824);
-    }
-  }
-  strftime(mod, sizeof(mod), "%d-%b-%Y %H:%M",
-           localtime(&de->file.modification_time));
-  url_encode(de->file_name, href, sizeof(href));
-  de->conn->num_bytes_sent += mg_printf(de->conn,
-      "<tr><td><a href=\"%s%s%s\">%s%s</a></td>"
-      "<td>&nbsp;%s</td><td>&nbsp;&nbsp;%s</td></tr>\n",
-      de->conn->request_info.uri, href, de->file.is_directory ? "/" : "",
-      de->file_name, de->file.is_directory ? "/" : "", mod, size);
-}
-
-// This function is called from send_directory() and used for
-// sorting directory entries by size, or name, or modification time.
-// On windows, __cdecl specification is needed in case if project is built
-// with __stdcall convention. qsort always requires __cdels callback.
-static int WINCDECL compare_dir_entries(const void *p1, const void *p2) {
-  const struct de *a = (const struct de *) p1, *b = (const struct de *) p2;
-  const char *query_string = a->conn->request_info.query_string;
-  int cmp_result = 0;
-
-  if (query_string == NULL) {
-    query_string = "na";
-  }
-
-  if (a->file.is_directory && !b->file.is_directory) {
-    return -1;  // Always put directories on top
-  } else if (!a->file.is_directory && b->file.is_directory) {
-    return 1;   // Always put directories on top
-  } else if (*query_string == 'n') {
-    cmp_result = strcmp(a->file_name, b->file_name);
-  } else if (*query_string == 's') {
-    cmp_result = a->file.size == b->file.size ? 0 :
-      a->file.size > b->file.size ? 1 : -1;
-  } else if (*query_string == 'd') {
-    cmp_result = a->file.modification_time == b->file.modification_time ? 0 :
-      a->file.modification_time > b->file.modification_time ? 1 : -1;
-  }
-
-  return query_string[1] == 'd' ? -cmp_result : cmp_result;
-}
-
-static int must_hide_file(struct mg_connection *conn, const char *path) {
-  const char *pw_pattern = "**" PASSWORDS_FILE_NAME "$";
-  const char *pattern = conn->ctx->config[HIDE_FILES];
-  return match_prefix(pw_pattern, strlen(pw_pattern), path) > 0 ||
-    (pattern != NULL && match_prefix(pattern, strlen(pattern), path) > 0);
-}
-
-static int scan_directory(struct mg_connection *conn, const char *dir,
-                          void *data, void (*cb)(struct de *, void *)) {
-  char path[PATH_MAX];
-  struct dirent *dp;
-  DIR *dirp;
-  struct de de;
-
-  if ((dirp = opendir(dir)) == NULL) {
-    return 0;
-  } else {
-    de.conn = conn;
-
-    while ((dp = readdir(dirp)) != NULL) {
-      // Do not show current dir and hidden files
-      if (!strcmp(dp->d_name, ".") ||
-          !strcmp(dp->d_name, "..") ||
-          must_hide_file(conn, dp->d_name)) {
-        continue;
-      }
-
-      mg_snprintf(conn, path, sizeof(path), "%s%c%s", dir, '/', dp->d_name);
-
-      // If we don't memset stat structure to zero, mtime will have
-      // garbage and strftime() will segfault later on in
-      // print_dir_entry(). memset is required only if mg_stat()
-      // fails. For more details, see
-      // http://code.google.com/p/mongoose/issues/detail?id=79
-      memset(&de.file, 0, sizeof(de.file));
-      mg_stat(conn, path, &de.file);
-
-      de.file_name = dp->d_name;
-      cb(&de, data);
-    }
-    (void) closedir(dirp);
-  }
-  return 1;
-}
-
-struct dir_scan_data {
-  struct de *entries;
-  int num_entries;
-  int arr_size;
-};
-
-static void dir_scan_callback(struct de *de, void *data) {
-  struct dir_scan_data *dsd = (struct dir_scan_data *) data;
-
-  if (dsd->entries == NULL || dsd->num_entries >= dsd->arr_size) {
-    dsd->arr_size *= 2;
-    dsd->entries = (struct de *) realloc(dsd->entries, dsd->arr_size *
-                                         sizeof(dsd->entries[0]));
-  }
-  if (dsd->entries == NULL) {
-    // TODO(lsm): propagate an error to the caller
-    dsd->num_entries = 0;
-  } else {
-    dsd->entries[dsd->num_entries].file_name = mg_strdup(de->file_name);
-    dsd->entries[dsd->num_entries].file = de->file;
-    dsd->entries[dsd->num_entries].conn = de->conn;
-    dsd->num_entries++;
-  }
-}
-
-static void handle_directory_request(struct mg_connection *conn,
-                                     const char *dir) {
-  int i, sort_direction;
-  struct dir_scan_data data = { NULL, 0, 128 };
-
-  if (!scan_directory(conn, dir, &data, dir_scan_callback)) {
-    send_http_error(conn, 500, "Cannot open directory",
-                    "Error: opendir(%s): %s", dir, strerror(ERRNO));
-    return;
-  }
-
-  sort_direction = conn->request_info.query_string != NULL &&
-    conn->request_info.query_string[1] == 'd' ? 'a' : 'd';
-
-  conn->must_close = 1;
-  mg_printf(conn, "%s",
-            "HTTP/1.1 200 OK\r\n"
-            "Connection: close\r\n"
-            "Content-Type: text/html; charset=utf-8\r\n\r\n");
-
-  conn->num_bytes_sent += mg_printf(conn,
-      "<html><head><title>Index of %s</title>"
-      "<style>th {text-align: left;}</style></head>"
-      "<body><h1>Index of %s</h1><pre><table cellpadding=\"0\">"
-      "<tr><th><a href=\"?n%c\">Name</a></th>"
-      "<th><a href=\"?d%c\">Modified</a></th>"
-      "<th><a href=\"?s%c\">Size</a></th></tr>"
-      "<tr><td colspan=\"3\"><hr></td></tr>",
-      conn->request_info.uri, conn->request_info.uri,
-      sort_direction, sort_direction, sort_direction);
-
-  // Print first entry - link to a parent directory
-  conn->num_bytes_sent += mg_printf(conn,
-      "<tr><td><a href=\"%s%s\">%s</a></td>"
-      "<td>&nbsp;%s</td><td>&nbsp;&nbsp;%s</td></tr>\n",
-      conn->request_info.uri, "..", "Parent directory", "-", "-");
-
-  // Sort and print directory entries
-  qsort(data.entries, (size_t) data.num_entries, sizeof(data.entries[0]),
-        compare_dir_entries);
-  for (i = 0; i < data.num_entries; i++) {
-    print_dir_entry(&data.entries[i]);
-    free(data.entries[i].file_name);
-  }
-  free(data.entries);
-
-  conn->num_bytes_sent += mg_printf(conn, "%s", "</table></body></html>");
-  conn->status_code = 200;
-}
-
-// Send len bytes from the opened file to the client.
-static void send_file_data(struct mg_connection *conn, struct file *filep,
-                           int64_t offset, int64_t len) {
-  char buf[MG_BUF_LEN];
-  int to_read, num_read, num_written;
-
-  if (len > 0 && filep->membuf != NULL && filep->size > 0) {
-    if (len > filep->size - offset) {
-      len = filep->size - offset;
-    }
-    mg_write(conn, filep->membuf + offset, (size_t) len);
-  } else if (len > 0 && filep->fp != NULL) {
-    fseeko(filep->fp, offset, SEEK_SET);
-    while (len > 0) {
-      // Calculate how much to read from the file in the buffer
-      to_read = sizeof(buf);
-      if ((int64_t) to_read > len) {
-        to_read = (int) len;
-      }
-
-      // Read from file, exit the loop on error
-      if ((num_read = fread(buf, 1, (size_t) to_read, filep->fp)) <= 0) {
-        break;
-      }
-
-      // Send read bytes to the client, exit the loop on error
-      if ((num_written = mg_write(conn, buf, (size_t) num_read)) != num_read) {
-        break;
-      }
-
-      // Both read and were successful, adjust counters
-      conn->num_bytes_sent += num_written;
-      len -= num_written;
-    }
-  }
-}
-
-static int parse_range_header(const char *header, int64_t *a, int64_t *b) {
-  return sscanf(header, "bytes=%" INT64_FMT "-%" INT64_FMT, a, b);
-}
-
-static void gmt_time_string(char *buf, size_t buf_len, time_t *t) {
-  strftime(buf, buf_len, "%a, %d %b %Y %H:%M:%S GMT", gmtime(t));
-}
-
-static void construct_etag(char *buf, size_t buf_len,
-                           const struct file *filep) {
-  snprintf(buf, buf_len, "\"%lx.%" INT64_FMT "\"",
-           (unsigned long) filep->modification_time, filep->size);
-}
-
-static void fclose_on_exec(struct file *filep) {
-  if (filep != NULL && filep->fp != NULL) {
-#ifndef _WIN32
-    fcntl(fileno(filep->fp), F_SETFD, FD_CLOEXEC);
-#endif
-  }
-}
-
-static void handle_file_request(struct mg_connection *conn, const char *path,
-                                struct file *filep) {
-  char date[64], lm[64], etag[64], range[64];
-  const char *msg = "OK", *hdr;
-  time_t curtime = time(NULL);
-  int64_t cl, r1, r2;
-  struct vec mime_vec;
-  int n;
-
-  get_mime_type(conn->ctx, path, &mime_vec);
-  cl = filep->size;
-  conn->status_code = 200;
-  range[0] = '\0';
-
-  if (!mg_fopen(conn, path, "rb", filep)) {
-    send_http_error(conn, 500, http_500_error,
-                    "fopen(%s): %s", path, strerror(ERRNO));
-    return;
-  }
-  fclose_on_exec(filep);
-
-  // If Range: header specified, act accordingly
-  r1 = r2 = 0;
-  hdr = mg_get_header(conn, "Range");
-  if (hdr != NULL && (n = parse_range_header(hdr, &r1, &r2)) > 0 &&
-      r1 >= 0 && r2 > 0) {
-    conn->status_code = 206;
-    cl = n == 2 ? (r2 > cl ? cl : r2) - r1 + 1: cl - r1;
-    mg_snprintf(conn, range, sizeof(range),
-                "Content-Range: bytes "
-                "%" INT64_FMT "-%"
-                INT64_FMT "/%" INT64_FMT "\r\n",
-                r1, r1 + cl - 1, filep->size);
-    msg = "Partial Content";
-  }
-
-  // Prepare Etag, Date, Last-Modified headers. Must be in UTC, according to
-  // http://www.w3.org/Protocols/rfc2616/rfc2616-sec3.html#sec3.3
-  gmt_time_string(date, sizeof(date), &curtime);
-  gmt_time_string(lm, sizeof(lm), &filep->modification_time);
-  construct_etag(etag, sizeof(etag), filep);
-
-  (void) mg_printf(conn,
-      "HTTP/1.1 %d %s\r\n"
-      "Date: %s\r\n"
-      "Last-Modified: %s\r\n"
-      "Etag: %s\r\n"
-      "Content-Type: %.*s\r\n"
-      "Content-Length: %" INT64_FMT "\r\n"
-      "Connection: %s\r\n"
-      "Accept-Ranges: bytes\r\n"
-      "%s\r\n",
-      conn->status_code, msg, date, lm, etag, (int) mime_vec.len,
-      mime_vec.ptr, cl, suggest_connection_header(conn), range);
-
-  if (strcmp(conn->request_info.request_method, "HEAD") != 0) {
-    send_file_data(conn, filep, r1, cl);
-  }
-  mg_fclose(filep);
-}
-
-void mg_send_file(struct mg_connection *conn, const char *path) {
-  struct file file = STRUCT_FILE_INITIALIZER;
-  if (mg_stat(conn, path, &file)) {
-    handle_file_request(conn, path, &file);
-  } else {
-    send_http_error(conn, 404, "Not Found", "%s", "File not found");
-  }
-}
-
-
-// Parse HTTP headers from the given buffer, advance buffer to the point
-// where parsing stopped.
-static void parse_http_headers(char **buf, struct mg_request_info *ri) {
-  int i;
-
-  for (i = 0; i < (int) ARRAY_SIZE(ri->http_headers); i++) {
-    ri->http_headers[i].name = skip_quoted(buf, ":", " ", 0);
-    ri->http_headers[i].value = skip(buf, "\r\n");
-    if (ri->http_headers[i].name[0] == '\0')
-      break;
-    ri->num_headers = i + 1;
-  }
-}
-
-static int is_valid_http_method(const char *method) {
-  return !strcmp(method, "GET") || !strcmp(method, "POST") ||
-    !strcmp(method, "HEAD") || !strcmp(method, "CONNECT") ||
-    !strcmp(method, "PUT") || !strcmp(method, "DELETE") ||
-    !strcmp(method, "OPTIONS") || !strcmp(method, "PROPFIND");
-}
-
-// Parse HTTP request, fill in mg_request_info structure.
-// This function modifies the buffer by NUL-terminating
-// HTTP request components, header names and header values.
-static int parse_http_message(char *buf, int len, struct mg_request_info *ri) {
-  int is_request, request_length = get_request_len(buf, len);
-  if (request_length > 0) {
-    // Reset attributes. DO NOT TOUCH is_ssl, remote_ip, remote_port
-    ri->remote_user = ri->request_method = ri->uri = ri->http_version = NULL;
-    ri->num_headers = 0;
-
-    buf[request_length - 1] = '\0';
-
-    // RFC says that all initial whitespaces should be ingored
-    while (*buf != '\0' && isspace(* (unsigned char *) buf)) {
-      buf++;
-    }
-    ri->request_method = skip(&buf, " ");
-    ri->uri = skip(&buf, " ");
-    ri->http_version = skip(&buf, "\r\n");
-    if (((is_request = is_valid_http_method(ri->request_method)) &&
-         memcmp(ri->http_version, "HTTP/", 5) != 0) ||
-        (!is_request && memcmp(ri->request_method, "HTTP/", 5)) != 0) {
-      request_length = -1;
-    } else {
-      if (is_request) {
-        ri->http_version += 5;
-      }
-      parse_http_headers(&buf, ri);
-    }
-  }
-  return request_length;
-}
-
-// Keep reading the input (either opened file descriptor fd, or socket sock,
-// or SSL descriptor ssl) into buffer buf, until \r\n\r\n appears in the
-// buffer (which marks the end of HTTP request). Buffer buf may already
-// have some data. The length of the data is stored in nread.
-// Upon every read operation, increase nread by the number of bytes read.
-static int read_request(FILE *fp, struct mg_connection *conn,
-                        char *buf, int bufsiz, int *nread) {
-  int request_len, n = 0;
-
-  request_len = get_request_len(buf, *nread);
-  while (*nread < bufsiz && request_len == 0 &&
-         (n = pull(fp, conn, buf + *nread, bufsiz - *nread)) > 0) {
-    *nread += n;
-    assert(*nread <= bufsiz);
-    request_len = get_request_len(buf, *nread);
-  }
-
-  return request_len <= 0 && n <= 0 ? -1 : request_len;
-}
-
-// For given directory path, substitute it to valid index file.
-// Return 0 if index file has been found, -1 if not found.
-// If the file is found, it's stats is returned in stp.
-static int substitute_index_file(struct mg_connection *conn, char *path,
-                                 size_t path_len, struct file *filep) {
-  const char *list = conn->ctx->config[INDEX_FILES];
-  struct file file = STRUCT_FILE_INITIALIZER;
-  struct vec filename_vec;
-  size_t n = strlen(path);
-  int found = 0;
-
-  // The 'path' given to us points to the directory. Remove all trailing
-  // directory separator characters from the end of the path, and
-  // then append single directory separator character.
-  while (n > 0 && path[n - 1] == '/') {
-    n--;
-  }
-  path[n] = '/';
-
-  // Traverse index files list. For each entry, append it to the given
-  // path and see if the file exists. If it exists, break the loop
-  while ((list = next_option(list, &filename_vec, NULL)) != NULL) {
-
-    // Ignore too long entries that may overflow path buffer
-    if (filename_vec.len > path_len - (n + 2))
-      continue;
-
-    // Prepare full path to the index file
-    mg_strlcpy(path + n + 1, filename_vec.ptr, filename_vec.len + 1);
-
-    // Does it exist?
-    if (mg_stat(conn, path, &file)) {
-      // Yes it does, break the loop
-      *filep = file;
-      found = 1;
-      break;
-    }
-  }
-
-  // If no index file exists, restore directory path
-  if (!found) {
-    path[n] = '\0';
-  }
-
-  return found;
-}
-
-// Return True if we should reply 304 Not Modified.
-static int is_not_modified(const struct mg_connection *conn,
-                           const struct file *filep) {
-  char etag[64];
-  const char *ims = mg_get_header(conn, "If-Modified-Since");
-  const char *inm = mg_get_header(conn, "If-None-Match");
-  construct_etag(etag, sizeof(etag), filep);
-  return (inm != NULL && !mg_strcasecmp(etag, inm)) ||
-    (ims != NULL && filep->modification_time <= parse_date_string(ims));
-}
-
-static int forward_body_data(struct mg_connection *conn, FILE *fp,
-                             SOCKET sock, SSL *ssl) {
-  const char *expect, *body;
-  char buf[MG_BUF_LEN];
-  int to_read, nread, buffered_len, success = 0;
-
-  expect = mg_get_header(conn, "Expect");
-  assert(fp != NULL);
-
-  if (conn->content_len == -1) {
-    send_http_error(conn, 411, "Length Required", "%s", "");
-  } else if (expect != NULL && mg_strcasecmp(expect, "100-continue")) {
-    send_http_error(conn, 417, "Expectation Failed", "%s", "");
-  } else {
-    if (expect != NULL) {
-      (void) mg_printf(conn, "%s", "HTTP/1.1 100 Continue\r\n\r\n");
-    }
-
-    body = conn->buf + conn->request_len + conn->consumed_content;
-    buffered_len = &conn->buf[conn->data_len] - body;
-    assert(buffered_len >= 0);
-    assert(conn->consumed_content == 0);
-
-    if (buffered_len > 0) {
-      if ((int64_t) buffered_len > conn->content_len) {
-        buffered_len = (int) conn->content_len;
-      }
-      push(fp, sock, ssl, body, (int64_t) buffered_len);
-      conn->consumed_content += buffered_len;
-    }
-
-    nread = 0;
-    while (conn->consumed_content < conn->content_len) {
-      to_read = sizeof(buf);
-      if ((int64_t) to_read > conn->content_len - conn->consumed_content) {
-        to_read = (int) (conn->content_len - conn->consumed_content);
-      }
-      nread = pull(NULL, conn, buf, to_read);
-      if (nread <= 0 || push(fp, sock, ssl, buf, nread) != nread) {
-        break;
-      }
-      conn->consumed_content += nread;
-    }
-
-    if (conn->consumed_content == conn->content_len) {
-      success = nread >= 0;
-    }
-
-    // Each error code path in this function must send an error
-    if (!success) {
-      send_http_error(conn, 577, http_500_error, "%s", "");
-    }
-  }
-
-  return success;
-}
-
-#if !defined(NO_CGI)
-// This structure helps to create an environment for the spawned CGI program.
-// Environment is an array of "VARIABLE=VALUE\0" ASCIIZ strings,
-// last element must be NULL.
-// However, on Windows there is a requirement that all these VARIABLE=VALUE\0
-// strings must reside in a contiguous buffer. The end of the buffer is
-// marked by two '\0' characters.
-// We satisfy both worlds: we create an envp array (which is vars), all
-// entries are actually pointers inside buf.
-struct cgi_env_block {
-  struct mg_connection *conn;
-  char buf[CGI_ENVIRONMENT_SIZE]; // Environment buffer
-  int len; // Space taken
-  char *vars[MAX_CGI_ENVIR_VARS]; // char **envp
-  int nvars; // Number of variables
-};
-
-static char *addenv(struct cgi_env_block *block,
-                    PRINTF_FORMAT_STRING(const char *fmt), ...)
-  PRINTF_ARGS(2, 3);
-
-// Append VARIABLE=VALUE\0 string to the buffer, and add a respective
-// pointer into the vars array.
-static char *addenv(struct cgi_env_block *block, const char *fmt, ...) {
-  int n, space;
-  char *added;
-  va_list ap;
-
-  // Calculate how much space is left in the buffer
-  space = sizeof(block->buf) - block->len - 2;
-  assert(space >= 0);
-
-  // Make a pointer to the free space int the buffer
-  added = block->buf + block->len;
-
-  // Copy VARIABLE=VALUE\0 string into the free space
-  va_start(ap, fmt);
-  n = mg_vsnprintf(block->conn, added, (size_t) space, fmt, ap);
-  va_end(ap);
-
-  // Make sure we do not overflow buffer and the envp array
-  if (n > 0 && n + 1 < space &&
-      block->nvars < (int) ARRAY_SIZE(block->vars) - 2) {
-    // Append a pointer to the added string into the envp array
-    block->vars[block->nvars++] = added;
-    // Bump up used length counter. Include \0 terminator
-    block->len += n + 1;
-  } else {
-    cry(block->conn, "%s: CGI env buffer truncated for [%s]", __func__, fmt);
-  }
-
-  return added;
-}
-
-static void prepare_cgi_environment(struct mg_connection *conn,
-                                    const char *prog,
-                                    struct cgi_env_block *blk) {
-  const char *s, *slash;
-  struct vec var_vec;
-  char *p, src_addr[20];
-  int  i;
-
-  blk->len = blk->nvars = 0;
-  blk->conn = conn;
-  sockaddr_to_string(src_addr, sizeof(src_addr), &conn->client.rsa);
-
-  addenv(blk, "SERVER_NAME=%s", conn->ctx->config[AUTHENTICATION_DOMAIN]);
-  addenv(blk, "SERVER_ROOT=%s", conn->ctx->config[DOCUMENT_ROOT]);
-  addenv(blk, "DOCUMENT_ROOT=%s", conn->ctx->config[DOCUMENT_ROOT]);
-
-  // Prepare the environment block
-  addenv(blk, "%s", "GATEWAY_INTERFACE=CGI/1.1");
-  addenv(blk, "%s", "SERVER_PROTOCOL=HTTP/1.1");
-  addenv(blk, "%s", "REDIRECT_STATUS=200"); // For PHP
-
-  // TODO(lsm): fix this for IPv6 case
-  addenv(blk, "SERVER_PORT=%d", ntohs(conn->client.lsa.sin.sin_port));
-
-  addenv(blk, "REQUEST_METHOD=%s", conn->request_info.request_method);
-  addenv(blk, "REMOTE_ADDR=%s", src_addr);
-  addenv(blk, "REMOTE_PORT=%d", conn->request_info.remote_port);
-  addenv(blk, "REQUEST_URI=%s", conn->request_info.uri);
-
-  // SCRIPT_NAME
-  assert(conn->request_info.uri[0] == '/');
-  slash = strrchr(conn->request_info.uri, '/');
-  if ((s = strrchr(prog, '/')) == NULL)
-    s = prog;
-  addenv(blk, "SCRIPT_NAME=%.*s%s", (int) (slash - conn->request_info.uri),
-         conn->request_info.uri, s);
-
-  addenv(blk, "SCRIPT_FILENAME=%s", prog);
-  addenv(blk, "PATH_TRANSLATED=%s", prog);
-  addenv(blk, "HTTPS=%s", conn->ssl == NULL ? "off" : "on");
-
-  if ((s = mg_get_header(conn, "Content-Type")) != NULL)
-    addenv(blk, "CONTENT_TYPE=%s", s);
-
-  if (conn->request_info.query_string != NULL)
-    addenv(blk, "QUERY_STRING=%s", conn->request_info.query_string);
-
-  if ((s = mg_get_header(conn, "Content-Length")) != NULL)
-    addenv(blk, "CONTENT_LENGTH=%s", s);
-
-  if ((s = getenv("PATH")) != NULL)
-    addenv(blk, "PATH=%s", s);
-
-  if (conn->path_info != NULL) {
-    addenv(blk, "PATH_INFO=%s", conn->path_info);
-  }
-
-#if defined(_WIN32)
-  if ((s = getenv("COMSPEC")) != NULL) {
-    addenv(blk, "COMSPEC=%s", s);
-  }
-  if ((s = getenv("SYSTEMROOT")) != NULL) {
-    addenv(blk, "SYSTEMROOT=%s", s);
-  }
-  if ((s = getenv("SystemDrive")) != NULL) {
-    addenv(blk, "SystemDrive=%s", s);
-  }
-#else
-  if ((s = getenv("LD_LIBRARY_PATH")) != NULL)
-    addenv(blk, "LD_LIBRARY_PATH=%s", s);
-#endif // _WIN32
-
-  if ((s = getenv("PERLLIB")) != NULL)
-    addenv(blk, "PERLLIB=%s", s);
-
-  if (conn->request_info.remote_user != NULL) {
-    addenv(blk, "REMOTE_USER=%s", conn->request_info.remote_user);
-    addenv(blk, "%s", "AUTH_TYPE=Digest");
-  }
-
-  // Add all headers as HTTP_* variables
-  for (i = 0; i < conn->request_info.num_headers; i++) {
-    p = addenv(blk, "HTTP_%s=%s",
-        conn->request_info.http_headers[i].name,
-        conn->request_info.http_headers[i].value);
-
-    // Convert variable name into uppercase, and change - to _
-    for (; *p != '=' && *p != '\0'; p++) {
-      if (*p == '-')
-        *p = '_';
-      *p = (char) toupper(* (unsigned char *) p);
-    }
-  }
-
-  // Add user-specified variables
-  s = conn->ctx->config[CGI_ENVIRONMENT];
-  while ((s = next_option(s, &var_vec, NULL)) != NULL) {
-    addenv(blk, "%.*s", (int) var_vec.len, var_vec.ptr);
-  }
-
-  blk->vars[blk->nvars++] = NULL;
-  blk->buf[blk->len++] = '\0';
-
-  assert(blk->nvars < (int) ARRAY_SIZE(blk->vars));
-  assert(blk->len > 0);
-  assert(blk->len < (int) sizeof(blk->buf));
-}
-
-static void handle_cgi_request(struct mg_connection *conn, const char *prog) {
-  int headers_len, data_len, i, fd_stdin[2], fd_stdout[2];
-  const char *status, *status_text;
-  char buf[16384], *pbuf, dir[PATH_MAX], *p;
-  struct mg_request_info ri;
-  struct cgi_env_block blk;
-  FILE *in, *out;
-  struct file fout = STRUCT_FILE_INITIALIZER;
-  pid_t pid;
-
-  prepare_cgi_environment(conn, prog, &blk);
-
-  // CGI must be executed in its own directory. 'dir' must point to the
-  // directory containing executable program, 'p' must point to the
-  // executable program name relative to 'dir'.
-  (void) mg_snprintf(conn, dir, sizeof(dir), "%s", prog);
-  if ((p = strrchr(dir, '/')) != NULL) {
-    *p++ = '\0';
-  } else {
-    dir[0] = '.', dir[1] = '\0';
-    p = (char *) prog;
-  }
-
-  pid = (pid_t) -1;
-  fd_stdin[0] = fd_stdin[1] = fd_stdout[0] = fd_stdout[1] = -1;
-  in = out = NULL;
-
-  if (pipe(fd_stdin) != 0 || pipe(fd_stdout) != 0) {
-    send_http_error(conn, 500, http_500_error,
-        "Cannot create CGI pipe: %s", strerror(ERRNO));
-    goto done;
-  }
-
-  pid = spawn_process(conn, p, blk.buf, blk.vars, fd_stdin[0], fd_stdout[1],
-                      dir);
-  // spawn_process() must close those!
-  // If we don't mark them as closed, close() attempt before
-  // return from this function throws an exception on Windows.
-  // Windows does not like when closed descriptor is closed again.
-  fd_stdin[0] = fd_stdout[1] = -1;
-
-  if (pid == (pid_t) -1) {
-    send_http_error(conn, 500, http_500_error,
-        "Cannot spawn CGI process [%s]: %s", prog, strerror(ERRNO));
-    goto done;
-  }
-
-  if ((in = fdopen(fd_stdin[1], "wb")) == NULL ||
-      (out = fdopen(fd_stdout[0], "rb")) == NULL) {
-    send_http_error(conn, 500, http_500_error,
-        "fopen: %s", strerror(ERRNO));
-    goto done;
-  }
-
-  setbuf(in, NULL);
-  setbuf(out, NULL);
-  fout.fp = out;
-
-  // Send POST data to the CGI process if needed
-  if (!strcmp(conn->request_info.request_method, "POST") &&
-      !forward_body_data(conn, in, INVALID_SOCKET, NULL)) {
-    goto done;
-  }
-
-  // Close so child gets an EOF.
-  fclose(in);
-  in = NULL;
-  fd_stdin[1] = -1;
-
-  // Now read CGI reply into a buffer. We need to set correct
-  // status code, thus we need to see all HTTP headers first.
-  // Do not send anything back to client, until we buffer in all
-  // HTTP headers.
-  data_len = 0;
-  headers_len = read_request(out, conn, buf, sizeof(buf), &data_len);
-  if (headers_len <= 0) {
-    send_http_error(conn, 500, http_500_error,
-                    "CGI program sent malformed or too big (>%u bytes) "
-                    "HTTP headers: [%.*s]",
-                    (unsigned) sizeof(buf), data_len, buf);
-    goto done;
-  }
-  pbuf = buf;
-  buf[headers_len - 1] = '\0';
-  parse_http_headers(&pbuf, &ri);
-
-  // Make up and send the status line
-  status_text = "OK";
-  if ((status = get_header(&ri, "Status")) != NULL) {
-    conn->status_code = atoi(status);
-    status_text = status;
-    while (isdigit(* (unsigned char *) status_text) || *status_text == ' ') {
-      status_text++;
-    }
-  } else if (get_header(&ri, "Location") != NULL) {
-    conn->status_code = 302;
-  } else {
-    conn->status_code = 200;
-  }
-  if (get_header(&ri, "Connection") != NULL &&
-      !mg_strcasecmp(get_header(&ri, "Connection"), "keep-alive")) {
-    conn->must_close = 1;
-  }
-  (void) mg_printf(conn, "HTTP/1.1 %d %s\r\n", conn->status_code,
-                   status_text);
-
-  // Send headers
-  for (i = 0; i < ri.num_headers; i++) {
-    mg_printf(conn, "%s: %s\r\n",
-              ri.http_headers[i].name, ri.http_headers[i].value);
-  }
-  mg_write(conn, "\r\n", 2);
-
-  // Send chunk of data that may have been read after the headers
-  conn->num_bytes_sent += mg_write(conn, buf + headers_len,
-                                   (size_t)(data_len - headers_len));
-
-  // Read the rest of CGI output and send to the client
-  send_file_data(conn, &fout, 0, INT64_MAX);
-
-done:
-  if (pid != (pid_t) -1) {
-    kill(pid, SIGKILL);
-  }
-  if (fd_stdin[0] != -1) {
-    close(fd_stdin[0]);
-  }
-  if (fd_stdout[1] != -1) {
-    close(fd_stdout[1]);
-  }
-
-  if (in != NULL) {
-    fclose(in);
-  } else if (fd_stdin[1] != -1) {
-    close(fd_stdin[1]);
-  }
-
-  if (out != NULL) {
-    fclose(out);
-  } else if (fd_stdout[0] != -1) {
-    close(fd_stdout[0]);
-  }
-}
-#endif // !NO_CGI
-
-// For a given PUT path, create all intermediate subdirectories
-// for given path. Return 0 if the path itself is a directory,
-// or -1 on error, 1 if OK.
-static int put_dir(struct mg_connection *conn, const char *path) {
-  char buf[PATH_MAX];
-  const char *s, *p;
-  struct file file = STRUCT_FILE_INITIALIZER;
-  int len, res = 1;
-
-  for (s = p = path + 2; (p = strchr(s, '/')) != NULL; s = ++p) {
-    len = p - path;
-    if (len >= (int) sizeof(buf)) {
-      res = -1;
-      break;
-    }
-    memcpy(buf, path, len);
-    buf[len] = '\0';
-
-    // Try to create intermediate directory
-    DEBUG_TRACE(("mkdir(%s)", buf));
-    if (!mg_stat(conn, buf, &file) && mg_mkdir(buf, 0755) != 0) {
-      res = -1;
-      break;
-    }
-
-    // Is path itself a directory?
-    if (p[1] == '\0') {
-      res = 0;
-    }
-  }
-
-  return res;
-}
-
-static void put_file(struct mg_connection *conn, const char *path) {
-  struct file file = STRUCT_FILE_INITIALIZER;
-  const char *range;
-  int64_t r1, r2;
-  int rc;
-
-  conn->status_code = mg_stat(conn, path, &file) ? 200 : 201;
-
-  if ((rc = put_dir(conn, path)) == 0) {
-    mg_printf(conn, "HTTP/1.1 %d OK\r\n\r\n", conn->status_code);
-  } else if (rc == -1) {
-    send_http_error(conn, 500, http_500_error,
-                    "put_dir(%s): %s", path, strerror(ERRNO));
-  } else if (!mg_fopen(conn, path, "wb+", &file) || file.fp == NULL) {
-    mg_fclose(&file);
-    send_http_error(conn, 500, http_500_error,
-                    "fopen(%s): %s", path, strerror(ERRNO));
-  } else {
-    fclose_on_exec(&file);
-    range = mg_get_header(conn, "Content-Range");
-    r1 = r2 = 0;
-    if (range != NULL && parse_range_header(range, &r1, &r2) > 0) {
-      conn->status_code = 206;
-      fseeko(file.fp, r1, SEEK_SET);
-    }
-    if (forward_body_data(conn, file.fp, INVALID_SOCKET, NULL)) {
-      mg_printf(conn, "HTTP/1.1 %d OK\r\n\r\n", conn->status_code);
-    }
-    mg_fclose(&file);
-  }
-}
-
-static void send_ssi_file(struct mg_connection *, const char *,
-                          struct file *, int);
-
-static void do_ssi_include(struct mg_connection *conn, const char *ssi,
-                           char *tag, int include_level) {
-  char file_name[MG_BUF_LEN], path[PATH_MAX], *p;
-  struct file file = STRUCT_FILE_INITIALIZER;
-
-  // sscanf() is safe here, since send_ssi_file() also uses buffer
-  // of size MG_BUF_LEN to get the tag. So strlen(tag) is always < MG_BUF_LEN.
-  if (sscanf(tag, " virtual=\"%[^\"]\"", file_name) == 1) {
-    // File name is relative to the webserver root
-    (void) mg_snprintf(conn, path, sizeof(path), "%s%c%s",
-        conn->ctx->config[DOCUMENT_ROOT], '/', file_name);
-  } else if (sscanf(tag, " file=\"%[^\"]\"", file_name) == 1) {
-    // File name is relative to the webserver working directory
-    // or it is absolute system path
-    (void) mg_snprintf(conn, path, sizeof(path), "%s", file_name);
-  } else if (sscanf(tag, " \"%[^\"]\"", file_name) == 1) {
-    // File name is relative to the currect document
-    (void) mg_snprintf(conn, path, sizeof(path), "%s", ssi);
-    if ((p = strrchr(path, '/')) != NULL) {
-      p[1] = '\0';
-    }
-    (void) mg_snprintf(conn, path + strlen(path),
-        sizeof(path) - strlen(path), "%s", file_name);
-  } else {
-    cry(conn, "Bad SSI #include: [%s]", tag);
-    return;
-  }
-
-  if (!mg_fopen(conn, path, "rb", &file)) {
-    cry(conn, "Cannot open SSI #include: [%s]: fopen(%s): %s",
-        tag, path, strerror(ERRNO));
-  } else {
-    fclose_on_exec(&file);
-    if (match_prefix(conn->ctx->config[SSI_EXTENSIONS],
-                     strlen(conn->ctx->config[SSI_EXTENSIONS]), path) > 0) {
-      send_ssi_file(conn, path, &file, include_level + 1);
-    } else {
-      send_file_data(conn, &file, 0, INT64_MAX);
-    }
-    mg_fclose(&file);
-  }
-}
-
-#if !defined(NO_POPEN)
-static void do_ssi_exec(struct mg_connection *conn, char *tag) {
-  char cmd[MG_BUF_LEN];
-  struct file file = STRUCT_FILE_INITIALIZER;
-
-  if (sscanf(tag, " \"%[^\"]\"", cmd) != 1) {
-    cry(conn, "Bad SSI #exec: [%s]", tag);
-  } else if ((file.fp = popen(cmd, "r")) == NULL) {
-    cry(conn, "Cannot SSI #exec: [%s]: %s", cmd, strerror(ERRNO));
-  } else {
-    send_file_data(conn, &file, 0, INT64_MAX);
-    pclose(file.fp);
-  }
-}
-#endif // !NO_POPEN
-
-static int mg_fgetc(struct file *filep, int offset) {
-  if (filep->membuf != NULL && offset >=0 && offset < filep->size) {
-    return ((unsigned char *) filep->membuf)[offset];
-  } else if (filep->fp != NULL) {
-    return fgetc(filep->fp);
-  } else {
-    return EOF;
-  }
-}
-
-static void send_ssi_file(struct mg_connection *conn, const char *path,
-                          struct file *filep, int include_level) {
-  char buf[MG_BUF_LEN];
-  int ch, offset, len, in_ssi_tag;
-
-  if (include_level > 10) {
-    cry(conn, "SSI #include level is too deep (%s)", path);
-    return;
-  }
-
-  in_ssi_tag = len = offset = 0;
-  while ((ch = mg_fgetc(filep, offset)) != EOF) {
-    if (in_ssi_tag && ch == '>') {
-      in_ssi_tag = 0;
-      buf[len++] = (char) ch;
-      buf[len] = '\0';
-      assert(len <= (int) sizeof(buf));
-      if (len < 6 || memcmp(buf, "<!--#", 5) != 0) {
-        // Not an SSI tag, pass it
-        (void) mg_write(conn, buf, (size_t) len);
-      } else {
-        if (!memcmp(buf + 5, "include", 7)) {
-          do_ssi_include(conn, path, buf + 12, include_level);
-#if !defined(NO_POPEN)
-        } else if (!memcmp(buf + 5, "exec", 4)) {
-          do_ssi_exec(conn, buf + 9);
-#endif // !NO_POPEN
-        } else {
-          cry(conn, "%s: unknown SSI " "command: \"%s\"", path, buf);
-        }
-      }
-      len = 0;
-    } else if (in_ssi_tag) {
-      if (len == 5 && memcmp(buf, "<!--#", 5) != 0) {
-        // Not an SSI tag
-        in_ssi_tag = 0;
-      } else if (len == (int) sizeof(buf) - 2) {
-        cry(conn, "%s: SSI tag is too large", path);
-        len = 0;
-      }
-      buf[len++] = ch & 0xff;
-    } else if (ch == '<') {
-      in_ssi_tag = 1;
-      if (len > 0) {
-        mg_write(conn, buf, (size_t) len);
-      }
-      len = 0;
-      buf[len++] = ch & 0xff;
-    } else {
-      buf[len++] = ch & 0xff;
-      if (len == (int) sizeof(buf)) {
-        mg_write(conn, buf, (size_t) len);
-        len = 0;
-      }
-    }
-  }
-
-  // Send the rest of buffered data
-  if (len > 0) {
-    mg_write(conn, buf, (size_t) len);
-  }
-}
-
-static void handle_ssi_file_request(struct mg_connection *conn,
-                                    const char *path) {
-  struct file file = STRUCT_FILE_INITIALIZER;
-
-  if (!mg_fopen(conn, path, "rb", &file)) {
-    send_http_error(conn, 500, http_500_error, "fopen(%s): %s", path,
-                    strerror(ERRNO));
-  } else {
-    conn->must_close = 1;
-    fclose_on_exec(&file);
-    mg_printf(conn, "HTTP/1.1 200 OK\r\n"
-              "Content-Type: text/html\r\nConnection: %s\r\n\r\n",
-              suggest_connection_header(conn));
-    send_ssi_file(conn, path, &file, 0);
-    mg_fclose(&file);
-  }
-}
-
-static void send_options(struct mg_connection *conn) {
-  conn->status_code = 200;
-
-  mg_printf(conn, "%s", "HTTP/1.1 200 OK\r\n"
-            "Allow: GET, POST, HEAD, CONNECT, PUT, DELETE, OPTIONS\r\n"
-            "DAV: 1\r\n\r\n");
-}
-
-// Writes PROPFIND properties for a collection element
-static void print_props(struct mg_connection *conn, const char* uri,
-                        struct file *filep) {
-  char mtime[64];
-  gmt_time_string(mtime, sizeof(mtime), &filep->modification_time);
-  conn->num_bytes_sent += mg_printf(conn,
-      "<d:response>"
-       "<d:href>%s</d:href>"
-       "<d:propstat>"
-        "<d:prop>"
-         "<d:resourcetype>%s</d:resourcetype>"
-         "<d:getcontentlength>%" INT64_FMT "</d:getcontentlength>"
-         "<d:getlastmodified>%s</d:getlastmodified>"
-        "</d:prop>"
-        "<d:status>HTTP/1.1 200 OK</d:status>"
-       "</d:propstat>"
-      "</d:response>\n",
-      uri,
-      filep->is_directory ? "<d:collection/>" : "",
-      filep->size,
-      mtime);
-}
-
-static void print_dav_dir_entry(struct de *de, void *data) {
-  char href[PATH_MAX];
-  struct mg_connection *conn = (struct mg_connection *) data;
-  mg_snprintf(conn, href, sizeof(href), "%s%s",
-              conn->request_info.uri, de->file_name);
-  print_props(conn, href, &de->file);
-}
-
-static void handle_propfind(struct mg_connection *conn, const char *path,
-                            struct file *filep) {
-  const char *depth = mg_get_header(conn, "Depth");
-
-  conn->must_close = 1;
-  conn->status_code = 207;
-  mg_printf(conn, "HTTP/1.1 207 Multi-Status\r\n"
-            "Connection: close\r\n"
-            "Content-Type: text/xml; charset=utf-8\r\n\r\n");
-
-  conn->num_bytes_sent += mg_printf(conn,
-      "<?xml version=\"1.0\" encoding=\"utf-8\"?>"
-      "<d:multistatus xmlns:d='DAV:'>\n");
-
-  // Print properties for the requested resource itself
-  print_props(conn, conn->request_info.uri, filep);
-
-  // If it is a directory, print directory entries too if Depth is not 0
-  if (filep->is_directory &&
-      !mg_strcasecmp(conn->ctx->config[ENABLE_DIRECTORY_LISTING], "yes") &&
-      (depth == NULL || strcmp(depth, "0") != 0)) {
-    scan_directory(conn, path, conn, &print_dav_dir_entry);
-  }
-
-  conn->num_bytes_sent += mg_printf(conn, "%s\n", "</d:multistatus>");
-}
-
-#if defined(USE_WEBSOCKET)
-
-// START OF SHA-1 code
-// Copyright(c) By Steve Reid <steve@edmweb.com>
-#define SHA1HANDSOFF
-#if defined(__sun)
-#include "solarisfixes.h"
-#endif
-
-union char64long16 { unsigned char c[64]; uint32_t l[16]; };
-
-#define rol(value, bits) (((value) << (bits)) | ((value) >> (32 - (bits))))
-
-static uint32_t blk0(union char64long16 *block, int i) {
-  // Forrest: SHA expect BIG_ENDIAN, swap if LITTLE_ENDIAN
-  if (!is_big_endian()) {
-    block->l[i] = (rol(block->l[i], 24) & 0xFF00FF00) |
-      (rol(block->l[i], 8) & 0x00FF00FF);
-  }
-  return block->l[i];
-}
-
-#define blk(i) (block->l[i&15] = rol(block->l[(i+13)&15]^block->l[(i+8)&15] \
-    ^block->l[(i+2)&15]^block->l[i&15],1))
-#define R0(v,w,x,y,z,i) z+=((w&(x^y))^y)+blk0(block, i)+0x5A827999+rol(v,5);w=rol(w,30);
-#define R1(v,w,x,y,z,i) z+=((w&(x^y))^y)+blk(i)+0x5A827999+rol(v,5);w=rol(w,30);
-#define R2(v,w,x,y,z,i) z+=(w^x^y)+blk(i)+0x6ED9EBA1+rol(v,5);w=rol(w,30);
-#define R3(v,w,x,y,z,i) z+=(((w|x)&y)|(w&x))+blk(i)+0x8F1BBCDC+rol(v,5);w=rol(w,30);
-#define R4(v,w,x,y,z,i) z+=(w^x^y)+blk(i)+0xCA62C1D6+rol(v,5);w=rol(w,30);
-
-typedef struct {
-    uint32_t state[5];
-    uint32_t count[2];
-    unsigned char buffer[64];
-} SHA1_CTX;
-
-static void SHA1Transform(uint32_t state[5], const unsigned char buffer[64]) {
-  uint32_t a, b, c, d, e;
-  union char64long16 block[1];
-
-  memcpy(block, buffer, 64);
-  a = state[0];
-  b = state[1];
-  c = state[2];
-  d = state[3];
-  e = state[4];
-  R0(a,b,c,d,e, 0); R0(e,a,b,c,d, 1); R0(d,e,a,b,c, 2); R0(c,d,e,a,b, 3);
-  R0(b,c,d,e,a, 4); R0(a,b,c,d,e, 5); R0(e,a,b,c,d, 6); R0(d,e,a,b,c, 7);
-  R0(c,d,e,a,b, 8); R0(b,c,d,e,a, 9); R0(a,b,c,d,e,10); R0(e,a,b,c,d,11);
-  R0(d,e,a,b,c,12); R0(c,d,e,a,b,13); R0(b,c,d,e,a,14); R0(a,b,c,d,e,15);
-  R1(e,a,b,c,d,16); R1(d,e,a,b,c,17); R1(c,d,e,a,b,18); R1(b,c,d,e,a,19);
-  R2(a,b,c,d,e,20); R2(e,a,b,c,d,21); R2(d,e,a,b,c,22); R2(c,d,e,a,b,23);
-  R2(b,c,d,e,a,24); R2(a,b,c,d,e,25); R2(e,a,b,c,d,26); R2(d,e,a,b,c,27);
-  R2(c,d,e,a,b,28); R2(b,c,d,e,a,29); R2(a,b,c,d,e,30); R2(e,a,b,c,d,31);
-  R2(d,e,a,b,c,32); R2(c,d,e,a,b,33); R2(b,c,d,e,a,34); R2(a,b,c,d,e,35);
-  R2(e,a,b,c,d,36); R2(d,e,a,b,c,37); R2(c,d,e,a,b,38); R2(b,c,d,e,a,39);
-  R3(a,b,c,d,e,40); R3(e,a,b,c,d,41); R3(d,e,a,b,c,42); R3(c,d,e,a,b,43);
-  R3(b,c,d,e,a,44); R3(a,b,c,d,e,45); R3(e,a,b,c,d,46); R3(d,e,a,b,c,47);
-  R3(c,d,e,a,b,48); R3(b,c,d,e,a,49); R3(a,b,c,d,e,50); R3(e,a,b,c,d,51);
-  R3(d,e,a,b,c,52); R3(c,d,e,a,b,53); R3(b,c,d,e,a,54); R3(a,b,c,d,e,55);
-  R3(e,a,b,c,d,56); R3(d,e,a,b,c,57); R3(c,d,e,a,b,58); R3(b,c,d,e,a,59);
-  R4(a,b,c,d,e,60); R4(e,a,b,c,d,61); R4(d,e,a,b,c,62); R4(c,d,e,a,b,63);
-  R4(b,c,d,e,a,64); R4(a,b,c,d,e,65); R4(e,a,b,c,d,66); R4(d,e,a,b,c,67);
-  R4(c,d,e,a,b,68); R4(b,c,d,e,a,69); R4(a,b,c,d,e,70); R4(e,a,b,c,d,71);
-  R4(d,e,a,b,c,72); R4(c,d,e,a,b,73); R4(b,c,d,e,a,74); R4(a,b,c,d,e,75);
-  R4(e,a,b,c,d,76); R4(d,e,a,b,c,77); R4(c,d,e,a,b,78); R4(b,c,d,e,a,79);
-  state[0] += a;
-  state[1] += b;
-  state[2] += c;
-  state[3] += d;
-  state[4] += e;
-  a = b = c = d = e = 0;
-  memset(block, '\0', sizeof(block));
-}
-
-static void SHA1Init(SHA1_CTX* context) {
-  context->state[0] = 0x67452301;
-  context->state[1] = 0xEFCDAB89;
-  context->state[2] = 0x98BADCFE;
-  context->state[3] = 0x10325476;
-  context->state[4] = 0xC3D2E1F0;
-  context->count[0] = context->count[1] = 0;
-}
-
-static void SHA1Update(SHA1_CTX* context, const unsigned char* data,
-                       uint32_t len) {
-  uint32_t i, j;
-
-  j = context->count[0];
-  if ((context->count[0] += len << 3) < j)
-    context->count[1]++;
-  context->count[1] += (len>>29);
-  j = (j >> 3) & 63;
-  if ((j + len) > 63) {
-    memcpy(&context->buffer[j], data, (i = 64-j));
-    SHA1Transform(context->state, context->buffer);
-    for ( ; i + 63 < len; i += 64) {
-      SHA1Transform(context->state, &data[i]);
-    }
-    j = 0;
-  }
-  else i = 0;
-  memcpy(&context->buffer[j], &data[i], len - i);
-}
-
-static void SHA1Final(unsigned char digest[20], SHA1_CTX* context) {
-  unsigned i;
-  unsigned char finalcount[8], c;
-
-  for (i = 0; i < 8; i++) {
-    finalcount[i] = (unsigned char)((context->count[(i >= 4 ? 0 : 1)]
-                                     >> ((3-(i & 3)) * 8) ) & 255);
-  }
-  c = 0200;
-  SHA1Update(context, &c, 1);
-  while ((context->count[0] & 504) != 448) {
-    c = 0000;
-    SHA1Update(context, &c, 1);
-  }
-  SHA1Update(context, finalcount, 8);
-  for (i = 0; i < 20; i++) {
-    digest[i] = (unsigned char)
-      ((context->state[i>>2] >> ((3-(i & 3)) * 8) ) & 255);
-  }
-  memset(context, '\0', sizeof(*context));
-  memset(&finalcount, '\0', sizeof(finalcount));
-}
-// END OF SHA1 CODE
-
-static void base64_encode(const unsigned char *src, int src_len, char *dst) {
-  static const char *b64 =
-    "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
-  int i, j, a, b, c;
-
-  for (i = j = 0; i < src_len; i += 3) {
-    a = src[i];
-    b = i + 1 >= src_len ? 0 : src[i + 1];
-    c = i + 2 >= src_len ? 0 : src[i + 2];
-
-    dst[j++] = b64[a >> 2];
-    dst[j++] = b64[((a & 3) << 4) | (b >> 4)];
-    if (i + 1 < src_len) {
-      dst[j++] = b64[(b & 15) << 2 | (c >> 6)];
-    }
-    if (i + 2 < src_len) {
-      dst[j++] = b64[c & 63];
-    }
-  }
-  while (j % 4 != 0) {
-    dst[j++] = '=';
-  }
-  dst[j++] = '\0';
-}
-
-static void send_websocket_handshake(struct mg_connection *conn) {
-  static const char *magic = "258EAFA5-E914-47DA-95CA-C5AB0DC85B11";
-  char buf[100], sha[20], b64_sha[sizeof(sha) * 2];
-  SHA1_CTX sha_ctx;
-
-  mg_snprintf(conn, buf, sizeof(buf), "%s%s",
-              mg_get_header(conn, "Sec-WebSocket-Key"), magic);
-  SHA1Init(&sha_ctx);
-  SHA1Update(&sha_ctx, (unsigned char *) buf, strlen(buf));
-  SHA1Final((unsigned char *) sha, &sha_ctx);
-  base64_encode((unsigned char *) sha, sizeof(sha), b64_sha);
-  mg_printf(conn, "%s%s%s",
-            "HTTP/1.1 101 Switching Protocols\r\n"
-            "Upgrade: websocket\r\n"
-            "Connection: Upgrade\r\n"
-            "Sec-WebSocket-Accept: ", b64_sha, "\r\n\r\n");
-}
-
-static void read_websocket(struct mg_connection *conn) {
-  unsigned char *buf = (unsigned char *) conn->buf + conn->request_len;
-  int n, len, mask_len, body_len, discard_len;
-
-  for (;;) {
-    if ((body_len = conn->data_len - conn->request_len) >= 2) {
-      len = buf[1] & 127;
-      mask_len = buf[1] & 128 ? 4 : 0;
-      if (len < 126) {
-        conn->content_len = 2 + mask_len + len;
-      } else if (len == 126 && body_len >= 4) {
-        conn->content_len = 4 + mask_len + ((((int) buf[2]) << 8) + buf[3]);
-      } else if (body_len >= 10) {
-        conn->content_len = 10 + mask_len +
-          (((uint64_t) htonl(* (uint32_t *) &buf[2])) << 32) +
-          htonl(* (uint32_t *) &buf[6]);
-      }
-    }
-
-    if (conn->content_len > 0) {
-      if (conn->ctx->callbacks.websocket_data != NULL &&
-          conn->ctx->callbacks.websocket_data(conn) == 0) {
-        break;  // Callback signalled to exit
-      }
-      discard_len = conn->content_len > body_len ?
-          body_len : (int) conn->content_len;
-      memmove(buf, buf + discard_len, conn->data_len - discard_len);
-      conn->data_len -= discard_len;
-      conn->content_len = conn->consumed_content = 0;
-    } else {
-      n = pull(NULL, conn, conn->buf + conn->data_len,
-               conn->buf_size - conn->data_len);
-      if (n <= 0) {
-        break;
-      }
-      conn->data_len += n;
-    }
-  }
-}
-
-static void handle_websocket_request(struct mg_connection *conn) {
-  if (strcmp(mg_get_header(conn, "Sec-WebSocket-Version"), "13") != 0) {
-    send_http_error(conn, 426, "Upgrade Required", "%s", "Upgrade Required");
-  } else if (conn->ctx->callbacks.websocket_connect != NULL &&
-             conn->ctx->callbacks.websocket_connect(conn) != 0) {
-    // Callback has returned non-zero, do not proceed with handshake
-  } else {
-    send_websocket_handshake(conn);
-    if (conn->ctx->callbacks.websocket_ready != NULL) {
-      conn->ctx->callbacks.websocket_ready(conn);
-    }
-    read_websocket(conn);
-  }
-}
-
-static int is_websocket_request(const struct mg_connection *conn) {
-  const char *host, *upgrade, *connection, *version, *key;
-
-  host = mg_get_header(conn, "Host");
-  upgrade = mg_get_header(conn, "Upgrade");
-  connection = mg_get_header(conn, "Connection");
-  key = mg_get_header(conn, "Sec-WebSocket-Key");
-  version = mg_get_header(conn, "Sec-WebSocket-Version");
-
-  return host != NULL && upgrade != NULL && connection != NULL &&
-    key != NULL && version != NULL &&
-    strstr(upgrade, "websocket") != NULL &&
-    strstr(connection, "Upgrade") != NULL;
-}
-#endif // !USE_WEBSOCKET
-
-static int isbyte(int n) {
-  return n >= 0 && n <= 255;
-}
-
-static int parse_net(const char *spec, uint32_t *net, uint32_t *mask) {
-  int n, a, b, c, d, slash = 32, len = 0;
-
-  if ((sscanf(spec, "%d.%d.%d.%d/%d%n", &a, &b, &c, &d, &slash, &n) == 5 ||
-      sscanf(spec, "%d.%d.%d.%d%n", &a, &b, &c, &d, &n) == 4) &&
-      isbyte(a) && isbyte(b) && isbyte(c) && isbyte(d) &&
-      slash >= 0 && slash < 33) {
-    len = n;
-    *net = ((uint32_t)a << 24) | ((uint32_t)b << 16) | ((uint32_t)c << 8) | d;
-    *mask = slash ? 0xffffffffU << (32 - slash) : 0;
-  }
-
-  return len;
-}
-
-static int set_throttle(const char *spec, uint32_t remote_ip, const char *uri) {
-  int throttle = 0;
-  struct vec vec, val;
-  uint32_t net, mask;
-  char mult;
-  double v;
-
-  while ((spec = next_option(spec, &vec, &val)) != NULL) {
-    mult = ',';
-    if (sscanf(val.ptr, "%lf%c", &v, &mult) < 1 || v < 0 ||
-        (lowercase(&mult) != 'k' && lowercase(&mult) != 'm' && mult != ',')) {
-      continue;
-    }
-    v *= lowercase(&mult) == 'k' ? 1024 : lowercase(&mult) == 'm' ? 1048576 : 1;
-    if (vec.len == 1 && vec.ptr[0] == '*') {
-      throttle = (int) v;
-    } else if (parse_net(vec.ptr, &net, &mask) > 0) {
-      if ((remote_ip & mask) == net) {
-        throttle = (int) v;
-      }
-    } else if (match_prefix(vec.ptr, vec.len, uri) > 0) {
-      throttle = (int) v;
-    }
-  }
-
-  return throttle;
-}
-
-static uint32_t get_remote_ip(const struct mg_connection *conn) {
-  return ntohl(* (uint32_t *) &conn->client.rsa.sin.sin_addr);
-}
-
-#ifdef USE_LUA
-
-#ifdef _WIN32
-static void *mmap(void *addr, int64_t len, int prot, int flags, int fd,
-                  int offset) {
-  HANDLE fh = (HANDLE) _get_osfhandle(fd);
-  HANDLE mh = CreateFileMapping(fh, 0, PAGE_READONLY, 0, 0, 0);
-  void *p = MapViewOfFile(mh, FILE_MAP_READ, 0, 0, (size_t) len);
-  CloseHandle(fh);
-  CloseHandle(mh);
-  return p;
-}
-#define munmap(x, y)  UnmapViewOfFile(x)
-#define MAP_FAILED NULL
-#define MAP_PRIVATE 0
-#define PROT_READ 0
-#else
-#include <sys/mman.h>
-#endif
-
-static void lsp(struct mg_connection *conn, const char *p, int64_t len,
-                lua_State *L) {
-  int i, j, pos = 0;
-
-  for (i = 0; i < len; i++) {
-    if (p[i] == '<' && p[i + 1] == '?') {
-      for (j = i + 1; j < len ; j++) {
-        if (p[j] == '?' && p[j + 1] == '>') {
-          mg_write(conn, p + pos, i - pos);
-          if (luaL_loadbuffer(L, p + (i + 2), j - (i + 2), "") == LUA_OK) {
-            lua_pcall(L, 0, LUA_MULTRET, 0);
-          }
-          pos = j + 2;
-          i = pos - 1;
-          break;
-        }
-      }
-    }
-  }
-
-  if (i > pos) {
-    mg_write(conn, p + pos, i - pos);
-  }
-}
-
-static int lsp_mg_print(lua_State *L) {
-  int i, num_args;
-  const char *str;
-  size_t size;
-  struct mg_connection *conn = lua_touserdata(L, lua_upvalueindex(1));
-
-  num_args = lua_gettop(L);
-  for (i = 1; i <= num_args; i++) {
-    if (lua_isstring(L, i)) {
-      str = lua_tolstring(L, i, &size);
-      mg_write(conn, str, size);
-    }
-  }
-
-  return 0;
-}
-
-static int lsp_mg_read(lua_State *L) {
-  struct mg_connection *conn = lua_touserdata(L, lua_upvalueindex(1));
-  char buf[1024];
-  int len = mg_read(conn, buf, sizeof(buf));
-
-  lua_settop(L, 0);
-  lua_pushlstring(L, buf, len);
-
-  return 1;
-}
-
-static void reg_string(struct lua_State *L, const char *name, const char *val) {
-  lua_pushstring(L, name);
-  lua_pushstring(L, val);
-  lua_rawset(L, -3);
-}
-
-static void reg_int(struct lua_State *L, const char *name, int val) {
-  lua_pushstring(L, name);
-  lua_pushinteger(L, val);
-  lua_rawset(L, -3);
-}
-
-static void prepare_lua_environment(struct mg_connection *conn, lua_State *L) {
-  const struct mg_request_info *ri = mg_get_request_info(conn);
-  extern void luaL_openlibs(lua_State *);
-  int i;
-
-  luaL_openlibs(L);
-#ifdef USE_LUA_SQLITE3
-  { extern int luaopen_lsqlite3(lua_State *); luaopen_lsqlite3(L); }
-#endif
-
-  // Register "print" function which calls mg_write()
-  lua_pushlightuserdata(L, conn);
-  lua_pushcclosure(L, lsp_mg_print, 1);
-  lua_setglobal(L, "print");
-
-  // Register mg_read()
-  lua_pushlightuserdata(L, conn);
-  lua_pushcclosure(L, lsp_mg_read, 1);
-  lua_setglobal(L, "read");
-
-  // Export request_info
-  lua_newtable(L);
-  reg_string(L, "request_method", ri->request_method);
-  reg_string(L, "uri", ri->uri);
-  reg_string(L, "http_version", ri->http_version);
-  reg_string(L, "query_string", ri->query_string);
-  reg_int(L, "remote_ip", ri->remote_ip);
-  reg_int(L, "remote_port", ri->remote_port);
-  reg_int(L, "num_headers", ri->num_headers);
-  lua_pushstring(L, "http_headers");
-  lua_newtable(L);
-  for (i = 0; i < ri->num_headers; i++) {
-    reg_string(L, ri->http_headers[i].name, ri->http_headers[i].value);
-  }
-  lua_rawset(L, -3);
-  lua_setglobal(L, "request_info");
-}
-
-static void handle_lsp_request(struct mg_connection *conn, const char *path,
-                               struct file *filep) {
-  void *p = NULL;
-  lua_State *L = NULL;
-
-  if (!mg_stat(conn, path, filep) || !mg_fopen(conn, path, "r", filep)) {
-    send_http_error(conn, 404, "Not Found", "%s", "File not found");
-  } else if (filep->membuf == NULL &&
-             (p = mmap(NULL, (size_t) filep->size, PROT_READ, MAP_PRIVATE,
-                       fileno(filep->fp), 0)) == MAP_FAILED) {
-    send_http_error(conn, 500, http_500_error, "mmap(%s, %zu, %d): %s", path,
-                    (size_t) filep->size, fileno(filep->fp), strerror(errno));
-  } else if ((L = luaL_newstate()) == NULL) {
-    send_http_error(conn, 500, http_500_error, "%s", "luaL_newstate failed");
-  } else {
-    // We're not sending HTTP headers here, Lua page must do it.
-    prepare_lua_environment(conn, L);
-    if (conn->ctx->callbacks.init_lua != NULL) {
-      conn->ctx->callbacks.init_lua(conn, L);
-    }
-    lsp(conn, filep->membuf == NULL ? p : filep->membuf, filep->size, L);
-  }
-
-  if (L) lua_close(L);
-  if (p) munmap(p, filep->size);
-  mg_fclose(filep);
-}
-#endif // USE_LUA
-
-int mg_upload(struct mg_connection *conn, const char *destination_dir) {
-  const char *content_type_header, *boundary_start;
-  char buf[MG_BUF_LEN], path[PATH_MAX], fname[1024], boundary[100], *s;
-  FILE *fp;
-  int bl, n, i, j, headers_len, boundary_len, len = 0, num_uploaded_files = 0;
-
-  // Request looks like this:
-  //
-  // POST /upload HTTP/1.1
-  // Host: 127.0.0.1:8080
-  // Content-Length: 244894
-  // Content-Type: multipart/form-data; boundary=----WebKitFormBoundaryRVr
-  //
-  // ------WebKitFormBoundaryRVr
-  // Content-Disposition: form-data; name="file"; filename="accum.png"
-  // Content-Type: image/png
-  //
-  //  <89>PNG
-  //  <PNG DATA>
-  // ------WebKitFormBoundaryRVr
-
-  // Extract boundary string from the Content-Type header
-  if ((content_type_header = mg_get_header(conn, "Content-Type")) == NULL ||
-      (boundary_start = strstr(content_type_header, "boundary=")) == NULL ||
-      (sscanf(boundary_start, "boundary=\"%99[^\"]\"", boundary) == 0 &&
-       sscanf(boundary_start, "boundary=%99s", boundary) == 0) ||
-      boundary[0] == '\0') {
-    return num_uploaded_files;
-  }
-
-  boundary_len = strlen(boundary);
-  bl = boundary_len + 4;  // \r\n--<boundary>
-  for (;;) {
-    // Pull in headers
-    assert(len >= 0 && len <= (int) sizeof(buf));
-    while ((n = mg_read(conn, buf + len, sizeof(buf) - len)) > 0) {
-      len += n;
-    }
-    if ((headers_len = get_request_len(buf, len)) <= 0) {
-      break;
-    }
-
-    // Fetch file name.
-    fname[0] = '\0';
-    for (i = j = 0; i < headers_len; i++) {
-      if (buf[i] == '\r' && buf[i + 1] == '\n') {
-        buf[i] = buf[i + 1] = '\0';
-        // TODO(lsm): don't expect filename to be the 3rd field,
-        // parse the header properly instead.
-        sscanf(&buf[j], "Content-Disposition: %*s %*s filename=\"%1023[^\"]",
-               fname);
-        j = i + 2;
-      }
-    }
-
-    // Give up if the headers are not what we expect
-    if (fname[0] == '\0') {
-      break;
-    }
-
-    // Move data to the beginning of the buffer
-    assert(len >= headers_len);
-    memmove(buf, &buf[headers_len], len - headers_len);
-    len -= headers_len;
-
-    // We open the file with exclusive lock held. This guarantee us
-    // there is no other thread can save into the same file simultaneously.
-    fp = NULL;
-    // Construct destination file name. Do not allow paths to have slashes.
-    if ((s = strrchr(fname, '/')) == NULL) {
-      s = fname;
-    }
-    // Open file in binary mode. TODO: set an exclusive lock.
-    snprintf(path, sizeof(path), "%s/%s", destination_dir, s);
-    if ((fp = fopen(path, "wb")) == NULL) {
-      break;
-    }
-
-    // Read POST data, write into file until boundary is found.
-    n = 0;
-    do {
-      len += n;
-      for (i = 0; i < len - bl; i++) {
-        if (!memcmp(&buf[i], "\r\n--", 4) &&
-            !memcmp(&buf[i + 4], boundary, boundary_len)) {
-          // Found boundary, that's the end of file data.
-          fwrite(buf, 1, i, fp);
-          fflush(fp);
-          num_uploaded_files++;
-          if (conn->ctx->callbacks.upload != NULL) {
-            conn->ctx->callbacks.upload(conn, path);
-          }
-          memmove(buf, &buf[i + bl], len - (i + bl));
-          len -= i + bl;
-          break;
-        }
-      }
-      if (len > bl) {
-        fwrite(buf, 1, len - bl, fp);
-        memmove(buf, &buf[len - bl], bl);
-        len = bl;
-      }
-    } while ((n = mg_read(conn, buf + len, sizeof(buf) - len)) > 0);
-    fclose(fp);
-  }
-
-  return num_uploaded_files;
-}
-
-static int is_put_or_delete_request(const struct mg_connection *conn) {
-  const char *s = conn->request_info.request_method;
-  return s != NULL && (!strcmp(s, "PUT") || !strcmp(s, "DELETE"));
-}
-
-static int get_first_ssl_listener_index(const struct mg_context *ctx) {
-  int i, index = -1;
-  for (i = 0; index == -1 && i < ctx->num_listening_sockets; i++) {
-    index = ctx->listening_sockets[i].is_ssl ? i : -1;
-  }
-  return index;
-}
-
-static void redirect_to_https_port(struct mg_connection *conn, int ssl_index) {
-  char host[1025];
-  const char *host_header;
-
-  if ((host_header = mg_get_header(conn, "Host")) == NULL ||
-      sscanf(host_header, "%1024[^:]", host) == 0) {
-    // Cannot get host from the Host: header. Fallback to our IP address.
-    sockaddr_to_string(host, sizeof(host), &conn->client.lsa);
-  }
-
-  mg_printf(conn, "HTTP/1.1 302 Found\r\nLocation: https://%s:%d%s\r\n\r\n",
-            host, (int) ntohs(conn->ctx->listening_sockets[ssl_index].
-                              lsa.sin.sin_port), conn->request_info.uri);
-}
-
-// This is the heart of the Mongoose's logic.
-// This function is called when the request is read, parsed and validated,
-// and Mongoose must decide what action to take: serve a file, or
-// a directory, or call embedded function, etcetera.
-static void handle_request(struct mg_connection *conn) {
-  struct mg_request_info *ri = &conn->request_info;
-  char path[PATH_MAX];
-  int uri_len, ssl_index;
-  struct file file = STRUCT_FILE_INITIALIZER;
-
-  if ((conn->request_info.query_string = strchr(ri->uri, '?')) != NULL) {
-    * ((char *) conn->request_info.query_string++) = '\0';
-  }
-  uri_len = (int) strlen(ri->uri);
-  url_decode(ri->uri, uri_len, (char *) ri->uri, uri_len + 1, 0);
-  remove_double_dots_and_double_slashes((char *) ri->uri);
-  convert_uri_to_file_name(conn, path, sizeof(path), &file);
-  conn->throttle = set_throttle(conn->ctx->config[THROTTLE],
-                                get_remote_ip(conn), ri->uri);
-
-  DEBUG_TRACE(("%s", ri->uri));
-  // Perform redirect and auth checks before calling begin_request() handler.
-  // Otherwise, begin_request() would need to perform auth checks and redirects.
-  if (!conn->client.is_ssl && conn->client.ssl_redir &&
-      (ssl_index = get_first_ssl_listener_index(conn->ctx)) > -1) {
-    redirect_to_https_port(conn, ssl_index);
-  } else if (!is_put_or_delete_request(conn) &&
-             !check_authorization(conn, path)) {
-    send_authorization_request(conn);
-  } else if (conn->ctx->callbacks.begin_request != NULL &&
-      conn->ctx->callbacks.begin_request(conn)) {
-    // Do nothing, callback has served the request
-#if defined(USE_WEBSOCKET)
-  } else if (is_websocket_request(conn)) {
-    handle_websocket_request(conn);
-#endif
-  } else if (!strcmp(ri->request_method, "OPTIONS")) {
-    send_options(conn);
-  } else if (conn->ctx->config[DOCUMENT_ROOT] == NULL) {
-    send_http_error(conn, 404, "Not Found", "Not Found");
-  } else if (is_put_or_delete_request(conn) &&
-             (conn->ctx->config[PUT_DELETE_PASSWORDS_FILE] == NULL ||
-              is_authorized_for_put(conn) != 1)) {
-    send_authorization_request(conn);
-  } else if (!strcmp(ri->request_method, "PUT")) {
-    put_file(conn, path);
-  } else if (!strcmp(ri->request_method, "DELETE")) {
-    if (mg_remove(path) == 0) {
-      send_http_error(conn, 200, "OK", "%s", "");
-    } else {
-      send_http_error(conn, 500, http_500_error, "remove(%s): %s", path,
-                      strerror(ERRNO));
-    }
-  } else if ((file.membuf == NULL && file.modification_time == (time_t) 0) ||
-             must_hide_file(conn, path)) {
-    send_http_error(conn, 404, "Not Found", "%s", "File not found");
-  } else if (file.is_directory && ri->uri[uri_len - 1] != '/') {
-    mg_printf(conn, "HTTP/1.1 301 Moved Permanently\r\n"
-              "Location: %s/\r\n\r\n", ri->uri);
-  } else if (!strcmp(ri->request_method, "PROPFIND")) {
-    handle_propfind(conn, path, &file);
-  } else if (file.is_directory &&
-             !substitute_index_file(conn, path, sizeof(path), &file)) {
-    if (!mg_strcasecmp(conn->ctx->config[ENABLE_DIRECTORY_LISTING], "yes")) {
-      handle_directory_request(conn, path);
-    } else {
-      send_http_error(conn, 403, "Directory Listing Denied",
-          "Directory listing denied");
-    }
-#ifdef USE_LUA
-  } else if (match_prefix("**.lp$", 6, path) > 0) {
-    handle_lsp_request(conn, path, &file);
-#endif
-#if !defined(NO_CGI)
-  } else if (match_prefix(conn->ctx->config[CGI_EXTENSIONS],
-                          strlen(conn->ctx->config[CGI_EXTENSIONS]),
-                          path) > 0) {
-    if (strcmp(ri->request_method, "POST") &&
-        strcmp(ri->request_method, "HEAD") &&
-        strcmp(ri->request_method, "GET")) {
-      send_http_error(conn, 501, "Not Implemented",
-                      "Method %s is not implemented", ri->request_method);
-    } else {
-      handle_cgi_request(conn, path);
-    }
-#endif // !NO_CGI
-  } else if (match_prefix(conn->ctx->config[SSI_EXTENSIONS],
-                          strlen(conn->ctx->config[SSI_EXTENSIONS]),
-                          path) > 0) {
-    handle_ssi_file_request(conn, path);
-  } else if (is_not_modified(conn, &file)) {
-    send_http_error(conn, 304, "Not Modified", "%s", "");
-  } else {
-    handle_file_request(conn, path, &file);
-  }
-}
-
-static void close_all_listening_sockets(struct mg_context *ctx) {
-  int i;
-  for (i = 0; i < ctx->num_listening_sockets; i++) {
-    closesocket(ctx->listening_sockets[i].sock);
-  }
-  free(ctx->listening_sockets);
-}
-
-// Valid listening port specification is: [ip_address:]port[s]
-// Examples: 80, 443s, 127.0.0.1:3128, 1.2.3.4:8080s
-// TODO(lsm): add parsing of the IPv6 address
-static int parse_port_string(const struct vec *vec, struct socket *so) {
-  int a, b, c, d, port, len;
-
-  // MacOS needs that. If we do not zero it, subsequent bind() will fail.
-  // Also, all-zeroes in the socket address means binding to all addresses
-  // for both IPv4 and IPv6 (INADDR_ANY and IN6ADDR_ANY_INIT).
-  memset(so, 0, sizeof(*so));
-
-  if (sscanf(vec->ptr, "%d.%d.%d.%d:%d%n", &a, &b, &c, &d, &port, &len) == 5) {
-    // Bind to a specific IPv4 address
-    so->lsa.sin.sin_addr.s_addr = htonl((a << 24) | (b << 16) | (c << 8) | d);
-  } else if (sscanf(vec->ptr, "%d%n", &port, &len) != 1 ||
-             len <= 0 ||
-             len > (int) vec->len ||
-             (vec->ptr[len] && vec->ptr[len] != 's' &&
-              vec->ptr[len] != 'r' && vec->ptr[len] != ',')) {
-    return 0;
-  }
-
-  so->is_ssl = vec->ptr[len] == 's';
-  so->ssl_redir = vec->ptr[len] == 'r';
-#if defined(USE_IPV6)
-  so->lsa.sin6.sin6_family = AF_INET6;
-  so->lsa.sin6.sin6_port = htons((uint16_t) port);
-#else
-  so->lsa.sin.sin_family = AF_INET;
-  so->lsa.sin.sin_port = htons((uint16_t) port);
-#endif
-
-  return 1;
-}
-
-static int set_ports_option(struct mg_context *ctx) {
-  const char *list = ctx->config[LISTENING_PORTS];
-  int on = 1, success = 1;
-  struct vec vec;
-  struct socket so;
-
-  while (success && (list = next_option(list, &vec, NULL)) != NULL) {
-    if (!parse_port_string(&vec, &so)) {
-      cry(fc(ctx), "%s: %.*s: invalid port spec. Expecting list of: %s",
-          __func__, (int) vec.len, vec.ptr, "[IP_ADDRESS:]PORT[s|p]");
-      success = 0;
-    } else if (so.is_ssl && ctx->ssl_ctx == NULL) {
-      cry(fc(ctx), "Cannot add SSL socket, is -ssl_certificate option set?");
-      success = 0;
-    } else if ((so.sock = socket(so.lsa.sa.sa_family, SOCK_STREAM, 6)) ==
-               INVALID_SOCKET ||
-               // On Windows, SO_REUSEADDR is recommended only for
-               // broadcast UDP sockets
-               setsockopt(so.sock, SOL_SOCKET, SO_REUSEADDR,
-                          (void *) &on, sizeof(on)) != 0 ||
-               bind(so.sock, &so.lsa.sa, sizeof(so.lsa)) != 0 ||
-               listen(so.sock, SOMAXCONN) != 0) {
-      cry(fc(ctx), "%s: cannot bind to %.*s: %s", __func__,
-          (int) vec.len, vec.ptr, strerror(ERRNO));
-      closesocket(so.sock);
-      success = 0;
-    } else {
-      set_close_on_exec(so.sock);
-      // TODO: handle realloc failure
-      ctx->listening_sockets = realloc(ctx->listening_sockets,
-                                       (ctx->num_listening_sockets + 1) *
-                                       sizeof(ctx->listening_sockets[0]));
-      ctx->listening_sockets[ctx->num_listening_sockets] = so;
-      ctx->num_listening_sockets++;
-    }
-  }
-
-  if (!success) {
-    close_all_listening_sockets(ctx);
-  }
-
-  return success;
-}
-
-static void log_header(const struct mg_connection *conn, const char *header,
-                       FILE *fp) {
-  const char *header_value;
-
-  if ((header_value = mg_get_header(conn, header)) == NULL) {
-    (void) fprintf(fp, "%s", " -");
-  } else {
-    (void) fprintf(fp, " \"%s\"", header_value);
-  }
-}
-
-static void log_access(const struct mg_connection *conn) {
-  const struct mg_request_info *ri;
-  FILE *fp;
-  char date[64], src_addr[20];
-
-  fp = conn->ctx->config[ACCESS_LOG_FILE] == NULL ?  NULL :
-    fopen(conn->ctx->config[ACCESS_LOG_FILE], "a+");
-
-  if (fp == NULL)
-    return;
-
-  strftime(date, sizeof(date), "%d/%b/%Y:%H:%M:%S %z",
-           localtime(&conn->birth_time));
-
-  ri = &conn->request_info;
-  flockfile(fp);
-
-  sockaddr_to_string(src_addr, sizeof(src_addr), &conn->client.rsa);
-  fprintf(fp, "%s - %s [%s] \"%s %s HTTP/%s\" %d %" INT64_FMT,
-          src_addr, ri->remote_user == NULL ? "-" : ri->remote_user, date,
-          ri->request_method ? ri->request_method : "-",
-          ri->uri ? ri->uri : "-", ri->http_version,
-          conn->status_code, conn->num_bytes_sent);
-  log_header(conn, "Referer", fp);
-  log_header(conn, "User-Agent", fp);
-  fputc('\n', fp);
-  fflush(fp);
-
-  funlockfile(fp);
-  fclose(fp);
-}
-
-// Verify given socket address against the ACL.
-// Return -1 if ACL is malformed, 0 if address is disallowed, 1 if allowed.
-static int check_acl(struct mg_context *ctx, uint32_t remote_ip) {
-  int allowed, flag;
-  uint32_t net, mask;
-  struct vec vec;
-  const char *list = ctx->config[ACCESS_CONTROL_LIST];
-
-  // If any ACL is set, deny by default
-  allowed = list == NULL ? '+' : '-';
-
-  while ((list = next_option(list, &vec, NULL)) != NULL) {
-    flag = vec.ptr[0];
-    if ((flag != '+' && flag != '-') ||
-        parse_net(&vec.ptr[1], &net, &mask) == 0) {
-      cry(fc(ctx), "%s: subnet must be [+|-]x.x.x.x[/x]", __func__);
-      return -1;
-    }
-
-    if (net == (remote_ip & mask)) {
-      allowed = flag;
-    }
-  }
-
-  return allowed == '+';
-}
-
-#if !defined(_WIN32)
-static int set_uid_option(struct mg_context *ctx) {
-  struct passwd *pw;
-  const char *uid = ctx->config[RUN_AS_USER];
-  int success = 0;
-
-  if (uid == NULL) {
-    success = 1;
-  } else {
-    if ((pw = getpwnam(uid)) == NULL) {
-      cry(fc(ctx), "%s: unknown user [%s]", __func__, uid);
-    } else if (setgid(pw->pw_gid) == -1) {
-      cry(fc(ctx), "%s: setgid(%s): %s", __func__, uid, strerror(errno));
-    } else if (setuid(pw->pw_uid) == -1) {
-      cry(fc(ctx), "%s: setuid(%s): %s", __func__, uid, strerror(errno));
-    } else {
-      success = 1;
-    }
-  }
-
-  return success;
-}
-#endif // !_WIN32
-
-#if !defined(NO_SSL)
-static pthread_mutex_t *ssl_mutexes;
-
-static int sslize(struct mg_connection *conn, SSL_CTX *s, int (*func)(SSL *)) {
-  return (conn->ssl = SSL_new(s)) != NULL &&
-    SSL_set_fd(conn->ssl, conn->client.sock) == 1 &&
-    func(conn->ssl) == 1;
-}
-
-// Return OpenSSL error message
-static const char *ssl_error(void) {
-  unsigned long err;
-  err = ERR_get_error();
-  return err == 0 ? "" : ERR_error_string(err, NULL);
-}
-
-static void ssl_locking_callback(int mode, int mutex_num, const char *file,
-                                 int line) {
-  (void) line;
-  (void) file;
-
-  if (mode & 1) {  // 1 is CRYPTO_LOCK
-    (void) pthread_mutex_lock(&ssl_mutexes[mutex_num]);
-  } else {
-    (void) pthread_mutex_unlock(&ssl_mutexes[mutex_num]);
-  }
-}
-
-static unsigned long ssl_id_callback(void) {
-  return (unsigned long) pthread_self();
-}
-
-#if !defined(NO_SSL_DL)
-static int load_dll(struct mg_context *ctx, const char *dll_name,
-                    struct ssl_func *sw) {
-  union {void *p; void (*fp)(void);} u;
-  void  *dll_handle;
-  struct ssl_func *fp;
-
-  if ((dll_handle = dlopen(dll_name, RTLD_LAZY)) == NULL) {
-    cry(fc(ctx), "%s: cannot load %s", __func__, dll_name);
-    return 0;
-  }
-
-  for (fp = sw; fp->name != NULL; fp++) {
-#ifdef _WIN32
-    // GetProcAddress() returns pointer to function
-    u.fp = (void (*)(void)) dlsym(dll_handle, fp->name);
-#else
-    // dlsym() on UNIX returns void *. ISO C forbids casts of data pointers to
-    // function pointers. We need to use a union to make a cast.
-    u.p = dlsym(dll_handle, fp->name);
-#endif // _WIN32
-    if (u.fp == NULL) {
-      cry(fc(ctx), "%s: %s: cannot find %s", __func__, dll_name, fp->name);
-      return 0;
-    } else {
-      fp->ptr = u.fp;
-    }
-  }
-
-  return 1;
-}
-#endif // NO_SSL_DL
-
-// Dynamically load SSL library. Set up ctx->ssl_ctx pointer.
-static int set_ssl_option(struct mg_context *ctx) {
-  int i, size;
-  const char *pem;
-
-  // If PEM file is not specified, skip SSL initialization.
-  if ((pem = ctx->config[SSL_CERTIFICATE]) == NULL) {
-    return 1;
-  }
-
-#if !defined(NO_SSL_DL)
-  if (!load_dll(ctx, SSL_LIB, ssl_sw) ||
-      !load_dll(ctx, CRYPTO_LIB, crypto_sw)) {
-    return 0;
-  }
-#endif // NO_SSL_DL
-
-  // Initialize SSL library
-  SSL_library_init();
-  SSL_load_error_strings();
-
-  if ((ctx->ssl_ctx = SSL_CTX_new(SSLv23_server_method())) == NULL) {
-    cry(fc(ctx), "SSL_CTX_new (server) error: %s", ssl_error());
-    return 0;
-  }
-
-  // If user callback returned non-NULL, that means that user callback has
-  // set up certificate itself. In this case, skip sertificate setting.
-  if ((ctx->callbacks.init_ssl == NULL ||
-       !ctx->callbacks.init_ssl(ctx->ssl_ctx)) &&
-      (SSL_CTX_use_certificate_file(ctx->ssl_ctx, pem, 1) == 0 ||
-       SSL_CTX_use_PrivateKey_file(ctx->ssl_ctx, pem, 1) == 0)) {
-    cry(fc(ctx), "%s: cannot open %s: %s", __func__, pem, ssl_error());
-    return 0;
-  }
-
-  if (pem != NULL) {
-    (void) SSL_CTX_use_certificate_chain_file(ctx->ssl_ctx, pem);
-  }
-
-  // Initialize locking callbacks, needed for thread safety.
-  // http://www.openssl.org/support/faq.html#PROG1
-  size = sizeof(pthread_mutex_t) * CRYPTO_num_locks();
-  if ((ssl_mutexes = (pthread_mutex_t *) malloc((size_t)size)) == NULL) {
-    cry(fc(ctx), "%s: cannot allocate mutexes: %s", __func__, ssl_error());
-    return 0;
-  }
-
-  for (i = 0; i < CRYPTO_num_locks(); i++) {
-    pthread_mutex_init(&ssl_mutexes[i], NULL);
-  }
-
-  CRYPTO_set_locking_callback(&ssl_locking_callback);
-  CRYPTO_set_id_callback(&ssl_id_callback);
-
-  return 1;
-}
-
-static void uninitialize_ssl(struct mg_context *ctx) {
-  int i;
-  if (ctx->ssl_ctx != NULL) {
-    CRYPTO_set_locking_callback(NULL);
-    for (i = 0; i < CRYPTO_num_locks(); i++) {
-      pthread_mutex_destroy(&ssl_mutexes[i]);
-    }
-    CRYPTO_set_locking_callback(NULL);
-    CRYPTO_set_id_callback(NULL);
-  }
-}
-#endif // !NO_SSL
-
-static int set_gpass_option(struct mg_context *ctx) {
-  struct file file = STRUCT_FILE_INITIALIZER;
-  const char *path = ctx->config[GLOBAL_PASSWORDS_FILE];
-  if (path != NULL && !mg_stat(fc(ctx), path, &file)) {
-    cry(fc(ctx), "Cannot open %s: %s", path, strerror(ERRNO));
-    return 0;
-  }
-  return 1;
-}
-
-static int set_acl_option(struct mg_context *ctx) {
-  return check_acl(ctx, (uint32_t) 0x7f000001UL) != -1;
-}
-
-static void reset_per_request_attributes(struct mg_connection *conn) {
-  conn->path_info = NULL;
-  conn->num_bytes_sent = conn->consumed_content = 0;
-  conn->status_code = -1;
-  conn->must_close = conn->request_len = conn->throttle = 0;
-}
-
-static void close_socket_gracefully(struct mg_connection *conn) {
-#if defined(_WIN32)
-  char buf[MG_BUF_LEN];
-  int n;
-#endif
-  struct linger linger;
-
-  // Set linger option to avoid socket hanging out after close. This prevent
-  // ephemeral port exhaust problem under high QPS.
-  linger.l_onoff = 1;
-  linger.l_linger = 1;
-  setsockopt(conn->client.sock, SOL_SOCKET, SO_LINGER,
-             (char *) &linger, sizeof(linger));
-
-  // Send FIN to the client
-  shutdown(conn->client.sock, SHUT_WR);
-  set_non_blocking_mode(conn->client.sock);
-
-#if defined(_WIN32)
-  // Read and discard pending incoming data. If we do not do that and close the
-  // socket, the data in the send buffer may be discarded. This
-  // behaviour is seen on Windows, when client keeps sending data
-  // when server decides to close the connection; then when client
-  // does recv() it gets no data back.
-  do {
-    n = pull(NULL, conn, buf, sizeof(buf));
-  } while (n > 0);
-#endif
-
-  // Now we know that our FIN is ACK-ed, safe to close
-  closesocket(conn->client.sock);
-}
-
-static void close_connection(struct mg_connection *conn) {
-  conn->must_close = 1;
-  if (conn->client.sock != INVALID_SOCKET) {
-    close_socket_gracefully(conn);
-  }
-#ifndef NO_SSL
-  // Must be done AFTER socket is closed
-  if (conn->ssl != NULL) {
-    SSL_free(conn->ssl);
-  }
-#endif
-}
-
-void mg_close_connection(struct mg_connection *conn) {
-#ifndef NO_SSL
-  if (conn->client_ssl_ctx != NULL) {
-    SSL_CTX_free((SSL_CTX *) conn->client_ssl_ctx);
-  }
-#endif
-  close_connection(conn);
-  free(conn);
-}
-
-struct mg_connection *mg_connect(const char *host, int port, int use_ssl,
-                                 char *ebuf, size_t ebuf_len) {
-  static struct mg_context fake_ctx;
-  struct mg_connection *conn = NULL;
-  struct sockaddr_in sin;
-  struct hostent *he;
-  int sock;
-
-  if (host == NULL) {
-    snprintf(ebuf, ebuf_len, "%s", "NULL host");
-  } else if (use_ssl && SSLv23_client_method == NULL) {
-    snprintf(ebuf, ebuf_len, "%s", "SSL is not initialized");
-  } else if ((he = gethostbyname(host)) == NULL) {
-    snprintf(ebuf, ebuf_len, "gethostbyname(%s): %s", host, strerror(ERRNO));
-  } else if ((sock = socket(PF_INET, SOCK_STREAM, 0)) == INVALID_SOCKET) {
-    snprintf(ebuf, ebuf_len, "socket(): %s", strerror(ERRNO));
-  } else {
-    sin.sin_family = AF_INET;
-    sin.sin_port = htons((uint16_t) port);
-    sin.sin_addr = * (struct in_addr *) he->h_addr_list[0];
-    if (connect(sock, (struct sockaddr *) &sin, sizeof(sin)) != 0) {
-      snprintf(ebuf, ebuf_len, "connect(%s:%d): %s",
-               host, port, strerror(ERRNO));
-      closesocket(sock);
-    } else if ((conn = (struct mg_connection *)
-                calloc(1, sizeof(*conn) + MAX_REQUEST_SIZE)) == NULL) {
-      snprintf(ebuf, ebuf_len, "calloc(): %s", strerror(ERRNO));
-      closesocket(sock);
-#ifndef NO_SSL
-    } else if (use_ssl && (conn->client_ssl_ctx =
-                           SSL_CTX_new(SSLv23_client_method())) == NULL) {
-      snprintf(ebuf, ebuf_len, "SSL_CTX_new error");
-      closesocket(sock);
-      free(conn);
-      conn = NULL;
-#endif // NO_SSL
-    } else {
-      conn->buf_size = MAX_REQUEST_SIZE;
-      conn->buf = (char *) (conn + 1);
-      conn->ctx = &fake_ctx;
-      conn->client.sock = sock;
-      conn->client.rsa.sin = sin;
-      conn->client.is_ssl = use_ssl;
-#ifndef NO_SSL
-      if (use_ssl) {
-        // SSL_CTX_set_verify call is needed to switch off server certificate
-        // checking, which is off by default in OpenSSL and on in yaSSL.
-        SSL_CTX_set_verify(conn->client_ssl_ctx, 0, 0);
-        sslize(conn, conn->client_ssl_ctx, SSL_connect);
-      }
-#endif
-    }
-  }
-
-  return conn;
-}
-
-static int is_valid_uri(const char *uri) {
-  // Conform to http://www.w3.org/Protocols/rfc2616/rfc2616-sec5.html#sec5.1.2
-  // URI can be an asterisk (*) or should start with slash.
-  return uri[0] == '/' || (uri[0] == '*' && uri[1] == '\0');
-}
-
-static int getreq(struct mg_connection *conn, char *ebuf, size_t ebuf_len) {
-  const char *cl;
-
-  ebuf[0] = '\0';
-  reset_per_request_attributes(conn);
-  conn->request_len = read_request(NULL, conn, conn->buf, conn->buf_size,
-                                   &conn->data_len);
-  assert(conn->request_len < 0 || conn->data_len >= conn->request_len);
-
-  if (conn->request_len == 0 && conn->data_len == conn->buf_size) {
-    snprintf(ebuf, ebuf_len, "%s", "Request Too Large");
-  } if (conn->request_len <= 0) {
-    snprintf(ebuf, ebuf_len, "%s", "Client closed connection");
-  } else if (parse_http_message(conn->buf, conn->buf_size,
-                                &conn->request_info) <= 0) {
-    snprintf(ebuf, ebuf_len, "Bad request: [%.*s]", conn->data_len, conn->buf);
-  } else {
-    // Request is valid
-    if ((cl = get_header(&conn->request_info, "Content-Length")) != NULL) {
-      conn->content_len = strtoll(cl, NULL, 10);
-    } else if (!mg_strcasecmp(conn->request_info.request_method, "POST") ||
-               !mg_strcasecmp(conn->request_info.request_method, "PUT")) {
-      conn->content_len = -1;
-    } else {
-      conn->content_len = 0;
-    }
-    conn->birth_time = time(NULL);
-  }
-  return ebuf[0] == '\0';
-}
-
-struct mg_connection *mg_download(const char *host, int port, int use_ssl,
-                                  char *ebuf, size_t ebuf_len,
-                                  const char *fmt, ...) {
-  struct mg_connection *conn;
-  va_list ap;
-
-  va_start(ap, fmt);
-  ebuf[0] = '\0';
-  if ((conn = mg_connect(host, port, use_ssl, ebuf, ebuf_len)) == NULL) {
-  } else if (mg_vprintf(conn, fmt, ap) <= 0) {
-    snprintf(ebuf, ebuf_len, "%s", "Error sending request");
-  } else {
-    getreq(conn, ebuf, ebuf_len);
-  }
-  if (ebuf[0] != '\0' && conn != NULL) {
-    mg_close_connection(conn);
-    conn = NULL;
-  }
-
-  return conn;
-}
-
-static void process_new_connection(struct mg_connection *conn) {
-  struct mg_request_info *ri = &conn->request_info;
-  int keep_alive_enabled, keep_alive, discard_len;
-  char ebuf[100];
-
-  keep_alive_enabled = !strcmp(conn->ctx->config[ENABLE_KEEP_ALIVE], "yes");
-  keep_alive = 0;
-
-  // Important: on new connection, reset the receiving buffer. Credit goes
-  // to crule42.
-  conn->data_len = 0;
-  do {
-    if (!getreq(conn, ebuf, sizeof(ebuf))) {
-      send_http_error(conn, 500, "Server Error", "%s", ebuf);
-    } else if (!is_valid_uri(conn->request_info.uri)) {
-      snprintf(ebuf, sizeof(ebuf), "Invalid URI: [%s]", ri->uri);
-      send_http_error(conn, 400, "Bad Request", "%s", ebuf);
-    } else if (strcmp(ri->http_version, "1.0") &&
-               strcmp(ri->http_version, "1.1")) {
-      snprintf(ebuf, sizeof(ebuf), "Bad HTTP version: [%s]", ri->http_version);
-      send_http_error(conn, 505, "Bad HTTP version", "%s", ebuf);
-    }
-
-    if (ebuf[0] == '\0') {
-      handle_request(conn);
-      if (conn->ctx->callbacks.end_request != NULL) {
-        conn->ctx->callbacks.end_request(conn, conn->status_code);
-      }
-      log_access(conn);
-    }
-    if (ri->remote_user != NULL) {
-      free((void *) ri->remote_user);
-    }
-
-    // NOTE(lsm): order is important here. should_keep_alive() call
-    // is using parsed request, which will be invalid after memmove's below.
-    // Therefore, memorize should_keep_alive() result now for later use
-    // in loop exit condition.
-    keep_alive = conn->ctx->stop_flag == 0 && keep_alive_enabled &&
-      conn->content_len >= 0 && should_keep_alive(conn);
-
-    // Discard all buffered data for this request
-    discard_len = conn->content_len >= 0 && conn->request_len > 0 &&
-      conn->request_len + conn->content_len < (int64_t) conn->data_len ?
-      (int) (conn->request_len + conn->content_len) : conn->data_len;
-    assert(discard_len >= 0);
-    memmove(conn->buf, conn->buf + discard_len, conn->data_len - discard_len);
-    conn->data_len -= discard_len;
-    assert(conn->data_len >= 0);
-    assert(conn->data_len <= conn->buf_size);
-  } while (keep_alive);
-}
-
-// Worker threads take accepted socket from the queue
-static int consume_socket(struct mg_context *ctx, struct socket *sp) {
-  (void) pthread_mutex_lock(&ctx->mutex);
-  DEBUG_TRACE(("going idle"));
-
-  // If the queue is empty, wait. We're idle at this point.
-  while (ctx->sq_head == ctx->sq_tail && ctx->stop_flag == 0) {
-    pthread_cond_wait(&ctx->sq_full, &ctx->mutex);
-  }
-
-  // If we're stopping, sq_head may be equal to sq_tail.
-  if (ctx->sq_head > ctx->sq_tail) {
-    // Copy socket from the queue and increment tail
-    *sp = ctx->queue[ctx->sq_tail % ARRAY_SIZE(ctx->queue)];
-    ctx->sq_tail++;
-    DEBUG_TRACE(("grabbed socket %d, going busy", sp->sock));
-
-    // Wrap pointers if needed
-    while (ctx->sq_tail > (int) ARRAY_SIZE(ctx->queue)) {
-      ctx->sq_tail -= ARRAY_SIZE(ctx->queue);
-      ctx->sq_head -= ARRAY_SIZE(ctx->queue);
-    }
-  }
-
-  (void) pthread_cond_signal(&ctx->sq_empty);
-  (void) pthread_mutex_unlock(&ctx->mutex);
-
-  return !ctx->stop_flag;
-}
-
-static void *worker_thread(void *thread_func_param) {
-  struct mg_context *ctx = thread_func_param;
-  struct mg_connection *conn;
-
-  conn = (struct mg_connection *) calloc(1, sizeof(*conn) + MAX_REQUEST_SIZE);
-  if (conn == NULL) {
-    cry(fc(ctx), "%s", "Cannot create new connection struct, OOM");
-  } else {
-    conn->buf_size = MAX_REQUEST_SIZE;
-    conn->buf = (char *) (conn + 1);
-    conn->ctx = ctx;
-    conn->request_info.user_data = ctx->user_data;
-
-    // Call consume_socket() even when ctx->stop_flag > 0, to let it signal
-    // sq_empty condvar to wake up the master waiting in produce_socket()
-    while (consume_socket(ctx, &conn->client)) {
-      conn->birth_time = time(NULL);
-
-      // Fill in IP, port info early so even if SSL setup below fails,
-      // error handler would have the corresponding info.
-      // Thanks to Johannes Winkelmann for the patch.
-      // TODO(lsm): Fix IPv6 case
-      conn->request_info.remote_port = ntohs(conn->client.rsa.sin.sin_port);
-      memcpy(&conn->request_info.remote_ip,
-             &conn->client.rsa.sin.sin_addr.s_addr, 4);
-      conn->request_info.remote_ip = ntohl(conn->request_info.remote_ip);
-      conn->request_info.is_ssl = conn->client.is_ssl;
-
-      if (!conn->client.is_ssl
-#ifndef NO_SSL
-          || sslize(conn, conn->ctx->ssl_ctx, SSL_accept)
-#endif
-         ) {
-        process_new_connection(conn);
-      }
-
-      close_connection(conn);
-    }
-    free(conn);
-  }
-
-  // Signal master that we're done with connection and exiting
-  (void) pthread_mutex_lock(&ctx->mutex);
-  ctx->num_threads--;
-  (void) pthread_cond_signal(&ctx->cond);
-  assert(ctx->num_threads >= 0);
-  (void) pthread_mutex_unlock(&ctx->mutex);
-
-  DEBUG_TRACE(("exiting"));
-  return NULL;
-}
-
-// Master thread adds accepted socket to a queue
-static void produce_socket(struct mg_context *ctx, const struct socket *sp) {
-  (void) pthread_mutex_lock(&ctx->mutex);
-
-  // If the queue is full, wait
-  while (ctx->stop_flag == 0 &&
-         ctx->sq_head - ctx->sq_tail >= (int) ARRAY_SIZE(ctx->queue)) {
-    (void) pthread_cond_wait(&ctx->sq_empty, &ctx->mutex);
-  }
-
-  if (ctx->sq_head - ctx->sq_tail < (int) ARRAY_SIZE(ctx->queue)) {
-    // Copy socket to the queue and increment head
-    ctx->queue[ctx->sq_head % ARRAY_SIZE(ctx->queue)] = *sp;
-    ctx->sq_head++;
-    DEBUG_TRACE(("queued socket %d", sp->sock));
-  }
-
-  (void) pthread_cond_signal(&ctx->sq_full);
-  (void) pthread_mutex_unlock(&ctx->mutex);
-}
-
-static int set_sock_timeout(SOCKET sock, int milliseconds) {
-#ifdef _WIN32
-  DWORD t = milliseconds;
-#else
-  struct timeval t;
-  t.tv_sec = milliseconds / 1000;
-  t.tv_usec = (milliseconds * 1000) % 1000000;
-#endif
-  return setsockopt(sock, SOL_SOCKET, SO_RCVTIMEO, (void *) &t, sizeof(t)) ||
-    setsockopt(sock, SOL_SOCKET, SO_SNDTIMEO, (void *) &t, sizeof(t));
-}
-
-static void accept_new_connection(const struct socket *listener,
-                                  struct mg_context *ctx) {
-  struct socket so;
-  char src_addr[20];
-  socklen_t len = sizeof(so.rsa);
-  int on = 1;
-
-  if ((so.sock = accept(listener->sock, &so.rsa.sa, &len)) == INVALID_SOCKET) {
-  } else if (!check_acl(ctx, ntohl(* (uint32_t *) &so.rsa.sin.sin_addr))) {
-    sockaddr_to_string(src_addr, sizeof(src_addr), &so.rsa);
-    cry(fc(ctx), "%s: %s is not allowed to connect", __func__, src_addr);
-    closesocket(so.sock);
-  } else {
-    // Put so socket structure into the queue
-    DEBUG_TRACE(("Accepted socket %d", (int) so.sock));
-    so.is_ssl = listener->is_ssl;
-    so.ssl_redir = listener->ssl_redir;
-    getsockname(so.sock, &so.lsa.sa, &len);
-    // Set TCP keep-alive. This is needed because if HTTP-level keep-alive
-    // is enabled, and client resets the connection, server won't get
-    // TCP FIN or RST and will keep the connection open forever. With TCP
-    // keep-alive, next keep-alive handshake will figure out that the client
-    // is down and will close the server end.
-    // Thanks to Igor Klopov who suggested the patch.
-    setsockopt(so.sock, SOL_SOCKET, SO_KEEPALIVE, (void *) &on, sizeof(on));
-    set_sock_timeout(so.sock, atoi(ctx->config[REQUEST_TIMEOUT]));
-    produce_socket(ctx, &so);
-  }
-}
-
-static void *master_thread(void *thread_func_param) {
-  struct mg_context *ctx = thread_func_param;
-  struct pollfd *pfd;
-  int i;
-
-  // Increase priority of the master thread
-#if defined(_WIN32)
-  SetThreadPriority(GetCurrentThread(), THREAD_PRIORITY_ABOVE_NORMAL);
-#endif
-
-#if defined(ISSUE_317)
-  struct sched_param sched_param;
-  sched_param.sched_priority = sched_get_priority_max(SCHED_RR);
-  pthread_setschedparam(pthread_self(), SCHED_RR, &sched_param);
-#endif
-
-  pfd = calloc(ctx->num_listening_sockets, sizeof(pfd[0]));
-  while (ctx->stop_flag == 0) {
-    for (i = 0; i < ctx->num_listening_sockets; i++) {
-      pfd[i].fd = ctx->listening_sockets[i].sock;
-      pfd[i].events = POLLIN;
-    }
-
-    if (poll(pfd, ctx->num_listening_sockets, 200) > 0) {
-      for (i = 0; i < ctx->num_listening_sockets; i++) {
-        if (ctx->stop_flag == 0 && pfd[i].revents == POLLIN) {
-          accept_new_connection(&ctx->listening_sockets[i], ctx);
-        }
-      }
-    }
-  }
-  free(pfd);
-  DEBUG_TRACE(("stopping workers"));
-
-  // Stop signal received: somebody called mg_stop. Quit.
-  close_all_listening_sockets(ctx);
-
-  // Wakeup workers that are waiting for connections to handle.
-  pthread_cond_broadcast(&ctx->sq_full);
-
-  // Wait until all threads finish
-  (void) pthread_mutex_lock(&ctx->mutex);
-  while (ctx->num_threads > 0) {
-    (void) pthread_cond_wait(&ctx->cond, &ctx->mutex);
-  }
-  (void) pthread_mutex_unlock(&ctx->mutex);
-
-  // All threads exited, no sync is needed. Destroy mutex and condvars
-  (void) pthread_mutex_destroy(&ctx->mutex);
-  (void) pthread_cond_destroy(&ctx->cond);
-  (void) pthread_cond_destroy(&ctx->sq_empty);
-  (void) pthread_cond_destroy(&ctx->sq_full);
-
-#if !defined(NO_SSL)
-  uninitialize_ssl(ctx);
-#endif
-  DEBUG_TRACE(("exiting"));
-
-  // Signal mg_stop() that we're done.
-  // WARNING: This must be the very last thing this
-  // thread does, as ctx becomes invalid after this line.
-  ctx->stop_flag = 2;
-  return NULL;
-}
-
-static void free_context(struct mg_context *ctx) {
-  int i;
-
-  // Deallocate config parameters
-  for (i = 0; i < NUM_OPTIONS; i++) {
-    if (ctx->config[i] != NULL)
-      free(ctx->config[i]);
-  }
-
-#ifndef NO_SSL
-  // Deallocate SSL context
-  if (ctx->ssl_ctx != NULL) {
-    SSL_CTX_free(ctx->ssl_ctx);
-  }
-  if (ssl_mutexes != NULL) {
-    free(ssl_mutexes);
-    ssl_mutexes = NULL;
-  }
-#endif // !NO_SSL
-
-  // Deallocate context itself
-  free(ctx);
-}
-
-void mg_stop(struct mg_context *ctx) {
-  ctx->stop_flag = 1;
-
-  // Wait until mg_fini() stops
-  while (ctx->stop_flag != 2) {
-    (void) mg_sleep(10);
-  }
-  free_context(ctx);
-
-#if defined(_WIN32) && !defined(__SYMBIAN32__)
-  (void) WSACleanup();
-#endif // _WIN32
-}
-
-struct mg_context *mg_start(const struct mg_callbacks *callbacks,
-                            void *user_data,
-                            const char **options) {
-  struct mg_context *ctx;
-  const char *name, *value, *default_value;
-  int i;
-
-#if defined(_WIN32) && !defined(__SYMBIAN32__)
-  WSADATA data;
-  WSAStartup(MAKEWORD(2,2), &data);
-  InitializeCriticalSection(&global_log_file_lock);
-#endif // _WIN32
-
-  // Allocate context and initialize reasonable general case defaults.
-  // TODO(lsm): do proper error handling here.
-  if ((ctx = (struct mg_context *) calloc(1, sizeof(*ctx))) == NULL) {
-    return NULL;
-  }
-  ctx->callbacks = *callbacks;
-  ctx->user_data = user_data;
-
-  while (options && (name = *options++) != NULL) {
-    if ((i = get_option_index(name)) == -1) {
-      cry(fc(ctx), "Invalid option: %s", name);
-      free_context(ctx);
-      return NULL;
-    } else if ((value = *options++) == NULL) {
-      cry(fc(ctx), "%s: option value cannot be NULL", name);
-      free_context(ctx);
-      return NULL;
-    }
-    if (ctx->config[i] != NULL) {
-      cry(fc(ctx), "warning: %s: duplicate option", name);
-      free(ctx->config[i]);
-    }
-    ctx->config[i] = mg_strdup(value);
-    DEBUG_TRACE(("[%s] -> [%s]", name, value));
-  }
-
-  // Set default value if needed
-  for (i = 0; config_options[i * ENTRIES_PER_CONFIG_OPTION] != NULL; i++) {
-    default_value = config_options[i * ENTRIES_PER_CONFIG_OPTION + 2];
-    if (ctx->config[i] == NULL && default_value != NULL) {
-      ctx->config[i] = mg_strdup(default_value);
-      DEBUG_TRACE(("Setting default: [%s] -> [%s]",
-                   config_options[i * ENTRIES_PER_CONFIG_OPTION + 1],
-                   default_value));
-    }
-  }
-
-  // NOTE(lsm): order is important here. SSL certificates must
-  // be initialized before listening ports. UID must be set last.
-  if (!set_gpass_option(ctx) ||
-#if !defined(NO_SSL)
-      !set_ssl_option(ctx) ||
-#endif
-      !set_ports_option(ctx) ||
-#if !defined(_WIN32)
-      !set_uid_option(ctx) ||
-#endif
-      !set_acl_option(ctx)) {
-    free_context(ctx);
-    return NULL;
-  }
-
-#if !defined(_WIN32) && !defined(__SYMBIAN32__)
-  // Ignore SIGPIPE signal, so if browser cancels the request, it
-  // won't kill the whole process.
-  (void) signal(SIGPIPE, SIG_IGN);
-  // Also ignoring SIGCHLD to let the OS to reap zombies properly.
-  (void) signal(SIGCHLD, SIG_IGN);
-#endif // !_WIN32
-
-  (void) pthread_mutex_init(&ctx->mutex, NULL);
-  (void) pthread_cond_init(&ctx->cond, NULL);
-  (void) pthread_cond_init(&ctx->sq_empty, NULL);
-  (void) pthread_cond_init(&ctx->sq_full, NULL);
-
-  // Start master (listening) thread
-  mg_start_thread(master_thread, ctx);
-
-  // Start worker threads
-  for (i = 0; i < atoi(ctx->config[NUM_THREADS]); i++) {
-    if (mg_start_thread(worker_thread, ctx) != 0) {
-      cry(fc(ctx), "Cannot start worker thread: %d", ERRNO);
-    } else {
-      ctx->num_threads++;
-    }
-  }
-
-  return ctx;
-}
+// Copyright (c) 2004-2013 Sergey Lyubka
+//
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to deal
+// in the Software without restriction, including without limitation the rights
+// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+// copies of the Software, and to permit persons to whom the Software is
+// furnished to do so, subject to the following conditions:
+//
+// The above copyright notice and this permission notice shall be included in
+// all copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+// THE SOFTWARE.
+
+#if defined(_WIN32)
+#define _CRT_SECURE_NO_WARNINGS // Disable deprecation warning in VS2005
+#else
+#ifdef __linux__
+#define _XOPEN_SOURCE 600     // For flockfile() on Linux
+#endif
+#define _LARGEFILE_SOURCE     // Enable 64-bit file offsets
+#define __STDC_FORMAT_MACROS  // <inttypes.h> wants this for C++
+#define __STDC_LIMIT_MACROS   // C++ wants that for INT64_MAX
+#endif
+
+#if defined (_MSC_VER)
+// conditional expression is constant: introduced by FD_SET(..)
+#pragma warning (disable : 4127)
+// non-constant aggregate initializer: issued due to missing C99 support
+#pragma warning (disable : 4204)
+#endif
+
+// Disable WIN32_LEAN_AND_MEAN.
+// This makes windows.h always include winsock2.h
+#ifdef WIN32_LEAN_AND_MEAN
+#undef WIN32_LEAN_AND_MEAN
+#endif
+
+#if defined(__SYMBIAN32__)
+#define NO_SSL // SSL is not supported
+#define NO_CGI // CGI is not supported
+#define PATH_MAX FILENAME_MAX
+#endif // __SYMBIAN32__
+
+#ifndef _WIN32_WCE // Some ANSI #includes are not available on Windows CE
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <errno.h>
+#include <signal.h>
+#include <fcntl.h>
+#endif // !_WIN32_WCE
+
+#include <time.h>
+#include <stdlib.h>
+#include <stdarg.h>
+#include <assert.h>
+#include <string.h>
+#include <ctype.h>
+#include <limits.h>
+#include <stddef.h>
+#include <stdio.h>
+
+#if defined(_WIN32) && !defined(__SYMBIAN32__) // Windows specific
+#define _WIN32_WINNT 0x0400 // To make it link in VS2005
+#include <windows.h>
+
+#ifndef PATH_MAX
+#define PATH_MAX MAX_PATH
+#endif
+
+#ifndef _WIN32_WCE
+#include <process.h>
+#include <direct.h>
+#include <io.h>
+#else // _WIN32_WCE
+#define NO_CGI // WinCE has no pipes
+
+typedef long off_t;
+
+#define errno   GetLastError()
+#define strerror(x)  _ultoa(x, (char *) _alloca(sizeof(x) *3 ), 10)
+#endif // _WIN32_WCE
+
+#define MAKEUQUAD(lo, hi) ((uint64_t)(((uint32_t)(lo)) | \
+      ((uint64_t)((uint32_t)(hi))) << 32))
+#define RATE_DIFF 10000000 // 100 nsecs
+#define EPOCH_DIFF MAKEUQUAD(0xd53e8000, 0x019db1de)
+#define SYS2UNIX_TIME(lo, hi) \
+  (time_t) ((MAKEUQUAD((lo), (hi)) - EPOCH_DIFF) / RATE_DIFF)
+
+// Visual Studio 6 does not know __func__ or __FUNCTION__
+// The rest of MS compilers use __FUNCTION__, not C99 __func__
+// Also use _strtoui64 on modern M$ compilers
+#if defined(_MSC_VER) && _MSC_VER < 1300
+#define STRX(x) #x
+#define STR(x) STRX(x)
+#define __func__ __FILE__ ":" STR(__LINE__)
+#define strtoull(x, y, z) strtoul(x, y, z)
+#define strtoll(x, y, z) strtol(x, y, z)
+#else
+#define __func__  __FUNCTION__
+#define strtoull(x, y, z) _strtoui64(x, y, z)
+#define strtoll(x, y, z) _strtoi64(x, y, z)
+#endif // _MSC_VER
+
+#define ERRNO   GetLastError()
+#define NO_SOCKLEN_T
+#define SSL_LIB   "ssleay32.dll"
+#define CRYPTO_LIB  "libeay32.dll"
+#define O_NONBLOCK  0
+#if !defined(EWOULDBLOCK)
+#define EWOULDBLOCK  WSAEWOULDBLOCK
+#endif // !EWOULDBLOCK
+#define _POSIX_
+#define INT64_FMT  "I64d"
+
+#define WINCDECL __cdecl
+#define SHUT_WR 1
+#define snprintf _snprintf
+#define vsnprintf _vsnprintf
+#define mg_sleep(x) Sleep(x)
+
+#define pipe(x) _pipe(x, MG_BUF_LEN, _O_BINARY)
+#define popen(x, y) _popen(x, y)
+#define pclose(x) _pclose(x)
+#define close(x) _close(x)
+#define dlsym(x,y) GetProcAddress((HINSTANCE) (x), (y))
+#define RTLD_LAZY  0
+#define fseeko(x, y, z) _lseeki64(_fileno(x), (y), (z))
+#define fdopen(x, y) _fdopen((x), (y))
+#define write(x, y, z) _write((x), (y), (unsigned) z)
+#define read(x, y, z) _read((x), (y), (unsigned) z)
+#define flockfile(x) EnterCriticalSection(&global_log_file_lock)
+#define funlockfile(x) LeaveCriticalSection(&global_log_file_lock)
+#define sleep(x) Sleep((x) * 1000)
+#define va_copy(x, y) x = y
+
+#if !defined(fileno)
+#define fileno(x) _fileno(x)
+#endif // !fileno MINGW #defines fileno
+
+typedef HANDLE pthread_mutex_t;
+typedef struct {HANDLE signal, broadcast;} pthread_cond_t;
+typedef DWORD pthread_t;
+#define pid_t HANDLE // MINGW typedefs pid_t to int. Using #define here.
+
+static int pthread_mutex_lock(pthread_mutex_t *);
+static int pthread_mutex_unlock(pthread_mutex_t *);
+static void to_unicode(const char *path, wchar_t *wbuf, size_t wbuf_len);
+struct file;
+static char *mg_fgets(char *buf, size_t size, struct file *filep, char **p);
+
+#if defined(HAVE_STDINT)
+#include <stdint.h>
+#else
+typedef unsigned int  uint32_t;
+typedef unsigned short  uint16_t;
+typedef unsigned __int64 uint64_t;
+typedef __int64   int64_t;
+#define INT64_MAX  9223372036854775807
+#endif // HAVE_STDINT
+
+// POSIX dirent interface
+struct dirent {
+  char d_name[PATH_MAX];
+};
+
+typedef struct DIR {
+  HANDLE   handle;
+  WIN32_FIND_DATAW info;
+  struct dirent  result;
+} DIR;
+
+#ifndef HAS_POLL
+struct pollfd {
+  int fd;
+  short events;
+  short revents;
+};
+#define POLLIN 1
+#endif
+
+
+// Mark required libraries
+#pragma comment(lib, "Ws2_32.lib")
+
+#else    // UNIX  specific
+#include <sys/wait.h>
+#include <sys/socket.h>
+#include <sys/poll.h>
+#include <netinet/in.h>
+#include <arpa/inet.h>
+#include <sys/time.h>
+#include <stdint.h>
+#include <inttypes.h>
+#include <netdb.h>
+
+#include <pwd.h>
+#include <unistd.h>
+#include <dirent.h>
+#if !defined(NO_SSL_DL) && !defined(NO_SSL)
+#include <dlfcn.h>
+#endif
+#include <pthread.h>
+#if defined(__MACH__)
+#define SSL_LIB   "libssl.dylib"
+#define CRYPTO_LIB  "libcrypto.dylib"
+#else
+#if !defined(SSL_LIB)
+#define SSL_LIB   "libssl.so"
+#endif
+#if !defined(CRYPTO_LIB)
+#define CRYPTO_LIB  "libcrypto.so"
+#endif
+#endif
+#ifndef O_BINARY
+#define O_BINARY  0
+#endif // O_BINARY
+#define closesocket(a) close(a)
+#define mg_mkdir(x, y) mkdir(x, y)
+#define mg_remove(x) remove(x)
+#define mg_rename(x, y) rename(x, y)
+#define mg_sleep(x) usleep((x) * 1000)
+#define ERRNO errno
+#define INVALID_SOCKET (-1)
+#define INT64_FMT PRId64
+typedef int SOCKET;
+#define WINCDECL
+
+#endif // End of Windows and UNIX specific includes
+
+#include "mongoose.h"
+
+#ifdef USE_LUA
+#include <lua.h>
+#include <lauxlib.h>
+#endif
+
+#define MONGOOSE_VERSION "3.8"
+#define PASSWORDS_FILE_NAME ".htpasswd"
+#define CGI_ENVIRONMENT_SIZE 4096
+#define MAX_CGI_ENVIR_VARS 64
+#define MG_BUF_LEN 8192
+#define MAX_REQUEST_SIZE 16384
+#define ARRAY_SIZE(array) (sizeof(array) / sizeof(array[0]))
+
+#ifdef _WIN32
+static CRITICAL_SECTION global_log_file_lock;
+static pthread_t pthread_self(void) {
+  return GetCurrentThreadId();
+}
+#endif // _WIN32
+
+#ifdef DEBUG_TRACE
+#undef DEBUG_TRACE
+#define DEBUG_TRACE(x)
+#else
+#if defined(DEBUG)
+#define DEBUG_TRACE(x) do { \
+  flockfile(stdout); \
+  printf("*** %lu.%p.%s.%d: ", \
+         (unsigned long) time(NULL), (void *) pthread_self(), \
+         __func__, __LINE__); \
+  printf x; \
+  putchar('\n'); \
+  fflush(stdout); \
+  funlockfile(stdout); \
+} while (0)
+#else
+#define DEBUG_TRACE(x)
+#endif // DEBUG
+#endif // DEBUG_TRACE
+
+// Darwin prior to 7.0 and Win32 do not have socklen_t
+#ifdef NO_SOCKLEN_T
+typedef int socklen_t;
+#endif // NO_SOCKLEN_T
+#define _DARWIN_UNLIMITED_SELECT
+
+#if !defined(MSG_NOSIGNAL)
+#define MSG_NOSIGNAL 0
+#endif
+
+#if !defined(SOMAXCONN)
+#define SOMAXCONN 100
+#endif
+
+#if !defined(PATH_MAX)
+#define PATH_MAX 4096
+#endif
+
+static const char *http_500_error = "Internal Server Error";
+
+#if defined(NO_SSL_DL)
+#include <openssl/ssl.h>
+#else
+// SSL loaded dynamically from DLL.
+// I put the prototypes here to be independent from OpenSSL source installation.
+typedef struct ssl_st SSL;
+typedef struct ssl_method_st SSL_METHOD;
+typedef struct ssl_ctx_st SSL_CTX;
+
+struct ssl_func {
+  const char *name;   // SSL function name
+  void  (*ptr)(void); // Function pointer
+};
+
+#define SSL_free (* (void (*)(SSL *)) ssl_sw[0].ptr)
+#define SSL_accept (* (int (*)(SSL *)) ssl_sw[1].ptr)
+#define SSL_connect (* (int (*)(SSL *)) ssl_sw[2].ptr)
+#define SSL_read (* (int (*)(SSL *, void *, int)) ssl_sw[3].ptr)
+#define SSL_write (* (int (*)(SSL *, const void *,int)) ssl_sw[4].ptr)
+#define SSL_get_error (* (int (*)(SSL *, int)) ssl_sw[5].ptr)
+#define SSL_set_fd (* (int (*)(SSL *, SOCKET)) ssl_sw[6].ptr)
+#define SSL_new (* (SSL * (*)(SSL_CTX *)) ssl_sw[7].ptr)
+#define SSL_CTX_new (* (SSL_CTX * (*)(SSL_METHOD *)) ssl_sw[8].ptr)
+#define SSLv23_server_method (* (SSL_METHOD * (*)(void)) ssl_sw[9].ptr)
+#define SSL_library_init (* (int (*)(void)) ssl_sw[10].ptr)
+#define SSL_CTX_use_PrivateKey_file (* (int (*)(SSL_CTX *, \
+        const char *, int)) ssl_sw[11].ptr)
+#define SSL_CTX_use_certificate_file (* (int (*)(SSL_CTX *, \
+        const char *, int)) ssl_sw[12].ptr)
+#define SSL_CTX_set_default_passwd_cb \
+  (* (void (*)(SSL_CTX *, mg_callback_t)) ssl_sw[13].ptr)
+#define SSL_CTX_free (* (void (*)(SSL_CTX *)) ssl_sw[14].ptr)
+#define SSL_load_error_strings (* (void (*)(void)) ssl_sw[15].ptr)
+#define SSL_CTX_use_certificate_chain_file \
+  (* (int (*)(SSL_CTX *, const char *)) ssl_sw[16].ptr)
+#define SSLv23_client_method (* (SSL_METHOD * (*)(void)) ssl_sw[17].ptr)
+#define SSL_pending (* (int (*)(SSL *)) ssl_sw[18].ptr)
+#define SSL_CTX_set_verify (* (void (*)(SSL_CTX *, int, int)) ssl_sw[19].ptr)
+
+#define CRYPTO_num_locks (* (int (*)(void)) crypto_sw[0].ptr)
+#define CRYPTO_set_locking_callback \
+  (* (void (*)(void (*)(int, int, const char *, int))) crypto_sw[1].ptr)
+#define CRYPTO_set_id_callback \
+  (* (void (*)(unsigned long (*)(void))) crypto_sw[2].ptr)
+#define ERR_get_error (* (unsigned long (*)(void)) crypto_sw[3].ptr)
+#define ERR_error_string (* (char * (*)(unsigned long,char *)) crypto_sw[4].ptr)
+
+// set_ssl_option() function updates this array.
+// It loads SSL library dynamically and changes NULLs to the actual addresses
+// of respective functions. The macros above (like SSL_connect()) are really
+// just calling these functions indirectly via the pointer.
+static struct ssl_func ssl_sw[] = {
+  {"SSL_free",   NULL},
+  {"SSL_accept",   NULL},
+  {"SSL_connect",   NULL},
+  {"SSL_read",   NULL},
+  {"SSL_write",   NULL},
+  {"SSL_get_error",  NULL},
+  {"SSL_set_fd",   NULL},
+  {"SSL_new",   NULL},
+  {"SSL_CTX_new",   NULL},
+  {"SSLv23_server_method", NULL},
+  {"SSL_library_init",  NULL},
+  {"SSL_CTX_use_PrivateKey_file", NULL},
+  {"SSL_CTX_use_certificate_file",NULL},
+  {"SSL_CTX_set_default_passwd_cb",NULL},
+  {"SSL_CTX_free",  NULL},
+  {"SSL_load_error_strings", NULL},
+  {"SSL_CTX_use_certificate_chain_file", NULL},
+  {"SSLv23_client_method", NULL},
+  {"SSL_pending", NULL},
+  {"SSL_CTX_set_verify", NULL},
+  {NULL,    NULL}
+};
+
+// Similar array as ssl_sw. These functions could be located in different lib.
+#if !defined(NO_SSL)
+static struct ssl_func crypto_sw[] = {
+  {"CRYPTO_num_locks",  NULL},
+  {"CRYPTO_set_locking_callback", NULL},
+  {"CRYPTO_set_id_callback", NULL},
+  {"ERR_get_error",  NULL},
+  {"ERR_error_string", NULL},
+  {NULL,    NULL}
+};
+#endif // NO_SSL
+#endif // NO_SSL_DL
+
+static const char *month_names[] = {
+  "Jan", "Feb", "Mar", "Apr", "May", "Jun",
+  "Jul", "Aug", "Sep", "Oct", "Nov", "Dec"
+};
+
+// Unified socket address. For IPv6 support, add IPv6 address structure
+// in the union u.
+union usa {
+  struct sockaddr sa;
+  struct sockaddr_in sin;
+#if defined(USE_IPV6)
+  struct sockaddr_in6 sin6;
+#endif
+};
+
+// Describes a string (chunk of memory).
+struct vec {
+  const char *ptr;
+  size_t len;
+};
+
+struct file {
+  int is_directory;
+  time_t modification_time;
+  int64_t size;
+  FILE *fp;
+  const char *membuf;   // Non-NULL if file data is in memory
+};
+#define STRUCT_FILE_INITIALIZER {0, 0, 0, NULL, NULL}
+
+// Describes listening socket, or socket which was accept()-ed by the master
+// thread and queued for future handling by the worker thread.
+struct socket {
+  SOCKET sock;          // Listening socket
+  union usa lsa;        // Local socket address
+  union usa rsa;        // Remote socket address
+  unsigned is_ssl:1;    // Is port SSL-ed
+  unsigned ssl_redir:1; // Is port supposed to redirect everything to SSL port
+};
+
+// NOTE(lsm): this enum shoulds be in sync with the config_options below.
+enum {
+  CGI_EXTENSIONS, CGI_ENVIRONMENT, PUT_DELETE_PASSWORDS_FILE, CGI_INTERPRETER,
+  PROTECT_URI, AUTHENTICATION_DOMAIN, SSI_EXTENSIONS, THROTTLE,
+  ACCESS_LOG_FILE, ENABLE_DIRECTORY_LISTING, ERROR_LOG_FILE,
+  GLOBAL_PASSWORDS_FILE, INDEX_FILES, ENABLE_KEEP_ALIVE, ACCESS_CONTROL_LIST,
+  EXTRA_MIME_TYPES, LISTENING_PORTS, DOCUMENT_ROOT, SSL_CERTIFICATE,
+  NUM_THREADS, RUN_AS_USER, REWRITE, HIDE_FILES, REQUEST_TIMEOUT,
+  NUM_OPTIONS
+};
+
+static const char *config_options[] = {
+  "C", "cgi_pattern", "**.cgi$|**.pl$|**.php$",
+  "E", "cgi_environment", NULL,
+  "G", "put_delete_auth_file", NULL,
+  "I", "cgi_interpreter", NULL,
+  "P", "protect_uri", NULL,
+  "R", "authentication_domain", "mydomain.com",
+  "S", "ssi_pattern", "**.shtml$|**.shtm$",
+  "T", "throttle", NULL,
+  "a", "access_log_file", NULL,
+  "d", "enable_directory_listing", "yes",
+  "e", "error_log_file", NULL,
+  "g", "global_auth_file", NULL,
+  "i", "index_files",
+        "index.html,index.htm,index.cgi,index.shtml,index.php,index.lp",
+  "k", "enable_keep_alive", "no",
+  "l", "access_control_list", NULL,
+  "m", "extra_mime_types", NULL,
+  "p", "listening_ports", "8080",
+  "r", "document_root",  ".",
+  "s", "ssl_certificate", NULL,
+  "t", "num_threads", "50",
+  "u", "run_as_user", NULL,
+  "w", "url_rewrite_patterns", NULL,
+  "x", "hide_files_patterns", NULL,
+  "z", "request_timeout_ms", "30000",
+  NULL
+};
+#define ENTRIES_PER_CONFIG_OPTION 3
+
+struct mg_context {
+  volatile int stop_flag;         // Should we stop event loop
+  SSL_CTX *ssl_ctx;               // SSL context
+  char *config[NUM_OPTIONS];      // Mongoose configuration parameters
+  struct mg_callbacks callbacks;  // User-defined callback function
+  void *user_data;                // User-defined data
+
+  struct socket *listening_sockets;
+  int num_listening_sockets;
+
+  volatile int num_threads;  // Number of threads
+  pthread_mutex_t mutex;     // Protects (max|num)_threads
+  pthread_cond_t  cond;      // Condvar for tracking workers terminations
+
+  struct socket queue[20];   // Accepted sockets
+  volatile int sq_head;      // Head of the socket queue
+  volatile int sq_tail;      // Tail of the socket queue
+  pthread_cond_t sq_full;    // Signaled when socket is produced
+  pthread_cond_t sq_empty;   // Signaled when socket is consumed
+};
+
+struct mg_connection {
+  struct mg_request_info request_info;
+  struct mg_context *ctx;
+  SSL *ssl;                   // SSL descriptor
+  SSL_CTX *client_ssl_ctx;    // SSL context for client connections
+  struct socket client;       // Connected client
+  time_t birth_time;          // Time when request was received
+  int64_t num_bytes_sent;     // Total bytes sent to client
+  int64_t content_len;        // Content-Length header value
+  int64_t consumed_content;   // How many bytes of content have been read
+  char *buf;                  // Buffer for received data
+  char *path_info;            // PATH_INFO part of the URL
+  int must_close;             // 1 if connection must be closed
+  int buf_size;               // Buffer size
+  int request_len;            // Size of the request + headers in a buffer
+  int data_len;               // Total size of data in a buffer
+  int status_code;            // HTTP reply status code, e.g. 200
+  int throttle;               // Throttling, bytes/sec. <= 0 means no throttle
+  time_t last_throttle_time;  // Last time throttled data was sent
+  int64_t last_throttle_bytes;// Bytes sent this second
+};
+
+const char **mg_get_valid_option_names(void) {
+  return config_options;
+}
+
+static int is_file_in_memory(struct mg_connection *conn, const char *path,
+                             struct file *filep) {
+  size_t size = 0;
+  if ((filep->membuf = conn->ctx->callbacks.open_file == NULL ? NULL :
+       conn->ctx->callbacks.open_file(conn, path, &size)) != NULL) {
+    // NOTE: override filep->size only on success. Otherwise, it might break
+    // constructs like if (!mg_stat() || !mg_fopen()) ...
+    filep->size = size;
+  }
+  return filep->membuf != NULL;
+}
+
+static int is_file_opened(const struct file *filep) {
+  return filep->membuf != NULL || filep->fp != NULL;
+}
+
+static int mg_fopen(struct mg_connection *conn, const char *path,
+                    const char *mode, struct file *filep) {
+  if (!is_file_in_memory(conn, path, filep)) {
+#ifdef _WIN32
+    wchar_t wbuf[PATH_MAX], wmode[20];
+    to_unicode(path, wbuf, ARRAY_SIZE(wbuf));
+    MultiByteToWideChar(CP_UTF8, 0, mode, -1, wmode, ARRAY_SIZE(wmode));
+    filep->fp = _wfopen(wbuf, wmode);
+#else
+    filep->fp = fopen(path, mode);
+#endif
+  }
+
+  return is_file_opened(filep);
+}
+
+static void mg_fclose(struct file *filep) {
+  if (filep != NULL && filep->fp != NULL) {
+    fclose(filep->fp);
+  }
+}
+
+static int get_option_index(const char *name) {
+  int i;
+
+  for (i = 0; config_options[i] != NULL; i += ENTRIES_PER_CONFIG_OPTION) {
+    if (strcmp(config_options[i], name) == 0 ||
+        strcmp(config_options[i + 1], name) == 0) {
+      return i / ENTRIES_PER_CONFIG_OPTION;
+    }
+  }
+  return -1;
+}
+
+const char *mg_get_option(const struct mg_context *ctx, const char *name) {
+  int i;
+  if ((i = get_option_index(name)) == -1) {
+    return NULL;
+  } else if (ctx->config[i] == NULL) {
+    return "";
+  } else {
+    return ctx->config[i];
+  }
+}
+
+static void sockaddr_to_string(char *buf, size_t len,
+                                     const union usa *usa) {
+  buf[0] = '\0';
+#if defined(USE_IPV6)
+  inet_ntop(usa->sa.sa_family, usa->sa.sa_family == AF_INET ?
+            (void *) &usa->sin.sin_addr :
+            (void *) &usa->sin6.sin6_addr, buf, len);
+#elif defined(_WIN32)
+  // Only Windoze Vista (and newer) have inet_ntop()
+  strncpy(buf, inet_ntoa(usa->sin.sin_addr), len);
+#else
+  inet_ntop(usa->sa.sa_family, (void *) &usa->sin.sin_addr, buf, len);
+#endif
+}
+
+static void cry(struct mg_connection *conn,
+                PRINTF_FORMAT_STRING(const char *fmt), ...) PRINTF_ARGS(2, 3);
+
+// Print error message to the opened error log stream.
+static void cry(struct mg_connection *conn, const char *fmt, ...) {
+  char buf[MG_BUF_LEN], src_addr[20];
+  va_list ap;
+  FILE *fp;
+  time_t timestamp;
+
+  va_start(ap, fmt);
+  (void) vsnprintf(buf, sizeof(buf), fmt, ap);
+  va_end(ap);
+
+  // Do not lock when getting the callback value, here and below.
+  // I suppose this is fine, since function cannot disappear in the
+  // same way string option can.
+  if (conn->ctx->callbacks.log_message == NULL ||
+      conn->ctx->callbacks.log_message(conn, buf) == 0) {
+    fp = conn->ctx == NULL || conn->ctx->config[ERROR_LOG_FILE] == NULL ? NULL :
+      fopen(conn->ctx->config[ERROR_LOG_FILE], "a+");
+
+    if (fp != NULL) {
+      flockfile(fp);
+      timestamp = time(NULL);
+
+      sockaddr_to_string(src_addr, sizeof(src_addr), &conn->client.rsa);
+      fprintf(fp, "[%010lu] [error] [client %s] ", (unsigned long) timestamp,
+              src_addr);
+
+      if (conn->request_info.request_method != NULL) {
+        fprintf(fp, "%s %s: ", conn->request_info.request_method,
+                conn->request_info.uri);
+      }
+
+      fprintf(fp, "%s", buf);
+      fputc('\n', fp);
+      funlockfile(fp);
+      fclose(fp);
+    }
+  }
+}
+
+// Return fake connection structure. Used for logging, if connection
+// is not applicable at the moment of logging.
+static struct mg_connection *fc(struct mg_context *ctx) {
+  static struct mg_connection fake_connection;
+  fake_connection.ctx = ctx;
+  return &fake_connection;
+}
+
+const char *mg_version(void) {
+  return MONGOOSE_VERSION;
+}
+
+struct mg_request_info *mg_get_request_info(struct mg_connection *conn) {
+  return &conn->request_info;
+}
+
+static void mg_strlcpy(register char *dst, register const char *src, size_t n) {
+  for (; *src != '\0' && n > 1; n--) {
+    *dst++ = *src++;
+  }
+  *dst = '\0';
+}
+
+static int lowercase(const char *s) {
+  return tolower(* (const unsigned char *) s);
+}
+
+static int mg_strncasecmp(const char *s1, const char *s2, size_t len) {
+  int diff = 0;
+
+  if (len > 0)
+    do {
+      diff = lowercase(s1++) - lowercase(s2++);
+    } while (diff == 0 && s1[-1] != '\0' && --len > 0);
+
+  return diff;
+}
+
+static int mg_strcasecmp(const char *s1, const char *s2) {
+  int diff;
+
+  do {
+    diff = lowercase(s1++) - lowercase(s2++);
+  } while (diff == 0 && s1[-1] != '\0');
+
+  return diff;
+}
+
+static char * mg_strndup(const char *ptr, size_t len) {
+  char *p;
+
+  if ((p = (char *) malloc(len + 1)) != NULL) {
+    mg_strlcpy(p, ptr, len + 1);
+  }
+
+  return p;
+}
+
+static char * mg_strdup(const char *str) {
+  return mg_strndup(str, strlen(str));
+}
+
+// Like snprintf(), but never returns negative value, or a value
+// that is larger than a supplied buffer.
+// Thanks to Adam Zeldis to pointing snprintf()-caused vulnerability
+// in his audit report.
+static int mg_vsnprintf(struct mg_connection *conn, char *buf, size_t buflen,
+                        const char *fmt, va_list ap) {
+  int n;
+
+  if (buflen == 0)
+    return 0;
+
+  n = vsnprintf(buf, buflen, fmt, ap);
+
+  if (n < 0) {
+    cry(conn, "vsnprintf error");
+    n = 0;
+  } else if (n >= (int) buflen) {
+    cry(conn, "truncating vsnprintf buffer: [%.*s]",
+        n > 200 ? 200 : n, buf);
+    n = (int) buflen - 1;
+  }
+  buf[n] = '\0';
+
+  return n;
+}
+
+static int mg_snprintf(struct mg_connection *conn, char *buf, size_t buflen,
+                       PRINTF_FORMAT_STRING(const char *fmt), ...)
+  PRINTF_ARGS(4, 5);
+
+static int mg_snprintf(struct mg_connection *conn, char *buf, size_t buflen,
+                       const char *fmt, ...) {
+  va_list ap;
+  int n;
+
+  va_start(ap, fmt);
+  n = mg_vsnprintf(conn, buf, buflen, fmt, ap);
+  va_end(ap);
+
+  return n;
+}
+
+// Skip the characters until one of the delimiters characters found.
+// 0-terminate resulting word. Skip the delimiter and following whitespaces.
+// Advance pointer to buffer to the next word. Return found 0-terminated word.
+// Delimiters can be quoted with quotechar.
+static char *skip_quoted(char **buf, const char *delimiters,
+                         const char *whitespace, char quotechar) {
+  char *p, *begin_word, *end_word, *end_whitespace;
+
+  begin_word = *buf;
+  end_word = begin_word + strcspn(begin_word, delimiters);
+
+  // Check for quotechar
+  if (end_word > begin_word) {
+    p = end_word - 1;
+    while (*p == quotechar) {
+      // If there is anything beyond end_word, copy it
+      if (*end_word == '\0') {
+        *p = '\0';
+        break;
+      } else {
+        size_t end_off = strcspn(end_word + 1, delimiters);
+        memmove (p, end_word, end_off + 1);
+        p += end_off; // p must correspond to end_word - 1
+        end_word += end_off + 1;
+      }
+    }
+    for (p++; p < end_word; p++) {
+      *p = '\0';
+    }
+  }
+
+  if (*end_word == '\0') {
+    *buf = end_word;
+  } else {
+    end_whitespace = end_word + 1 + strspn(end_word + 1, whitespace);
+
+    for (p = end_word; p < end_whitespace; p++) {
+      *p = '\0';
+    }
+
+    *buf = end_whitespace;
+  }
+
+  return begin_word;
+}
+
+// Simplified version of skip_quoted without quote char
+// and whitespace == delimiters
+static char *skip(char **buf, const char *delimiters) {
+  return skip_quoted(buf, delimiters, delimiters, 0);
+}
+
+
+// Return HTTP header value, or NULL if not found.
+static const char *get_header(const struct mg_request_info *ri,
+                              const char *name) {
+  int i;
+
+  for (i = 0; i < ri->num_headers; i++)
+    if (!mg_strcasecmp(name, ri->http_headers[i].name))
+      return ri->http_headers[i].value;
+
+  return NULL;
+}
+
+const char *mg_get_header(const struct mg_connection *conn, const char *name) {
+  return get_header(&conn->request_info, name);
+}
+
+// A helper function for traversing a comma separated list of values.
+// It returns a list pointer shifted to the next value, or NULL if the end
+// of the list found.
+// Value is stored in val vector. If value has form "x=y", then eq_val
+// vector is initialized to point to the "y" part, and val vector length
+// is adjusted to point only to "x".
+static const char *next_option(const char *list, struct vec *val,
+                               struct vec *eq_val) {
+  if (list == NULL || *list == '\0') {
+    // End of the list
+    list = NULL;
+  } else {
+    val->ptr = list;
+    if ((list = strchr(val->ptr, ',')) != NULL) {
+      // Comma found. Store length and shift the list ptr
+      val->len = list - val->ptr;
+      list++;
+    } else {
+      // This value is the last one
+      list = val->ptr + strlen(val->ptr);
+      val->len = list - val->ptr;
+    }
+
+    if (eq_val != NULL) {
+      // Value has form "x=y", adjust pointers and lengths
+      // so that val points to "x", and eq_val points to "y".
+      eq_val->len = 0;
+      eq_val->ptr = (const char *) memchr(val->ptr, '=', val->len);
+      if (eq_val->ptr != NULL) {
+        eq_val->ptr++;  // Skip over '=' character
+        eq_val->len = val->ptr + val->len - eq_val->ptr;
+        val->len = (eq_val->ptr - val->ptr) - 1;
+      }
+    }
+  }
+
+  return list;
+}
+
+static int match_prefix(const char *pattern, int pattern_len, const char *str) {
+  const char *or_str;
+  int i, j, len, res;
+
+  if ((or_str = (const char *) memchr(pattern, '|', pattern_len)) != NULL) {
+    res = match_prefix(pattern, or_str - pattern, str);
+    return res > 0 ? res :
+        match_prefix(or_str + 1, (pattern + pattern_len) - (or_str + 1), str);
+  }
+
+  i = j = 0;
+  res = -1;
+  for (; i < pattern_len; i++, j++) {
+    if (pattern[i] == '?' && str[j] != '\0') {
+      continue;
+    } else if (pattern[i] == '$') {
+      return str[j] == '\0' ? j : -1;
+    } else if (pattern[i] == '*') {
+      i++;
+      if (pattern[i] == '*') {
+        i++;
+        len = (int) strlen(str + j);
+      } else {
+        len = (int) strcspn(str + j, "/");
+      }
+      if (i == pattern_len) {
+        return j + len;
+      }
+      do {
+        res = match_prefix(pattern + i, pattern_len - i, str + j + len);
+      } while (res == -1 && len-- > 0);
+      return res == -1 ? -1 : j + res + len;
+    } else if (pattern[i] != str[j]) {
+      return -1;
+    }
+  }
+  return j;
+}
+
+// HTTP 1.1 assumes keep alive if "Connection:" header is not set
+// This function must tolerate situations when connection info is not
+// set up, for example if request parsing failed.
+static int should_keep_alive(const struct mg_connection *conn) {
+  const char *http_version = conn->request_info.http_version;
+  const char *header = mg_get_header(conn, "Connection");
+  if (conn->must_close ||
+      conn->status_code == 401 ||
+      mg_strcasecmp(conn->ctx->config[ENABLE_KEEP_ALIVE], "yes") != 0 ||
+      (header != NULL && mg_strcasecmp(header, "keep-alive") != 0) ||
+      (header == NULL && http_version && strcmp(http_version, "1.1"))) {
+    return 0;
+  }
+  return 1;
+}
+
+static const char *suggest_connection_header(const struct mg_connection *conn) {
+  return should_keep_alive(conn) ? "keep-alive" : "close";
+}
+
+static void send_http_error(struct mg_connection *, int, const char *,
+                            PRINTF_FORMAT_STRING(const char *fmt), ...)
+  PRINTF_ARGS(4, 5);
+
+
+static void send_http_error(struct mg_connection *conn, int status,
+                            const char *reason, const char *fmt, ...) {
+  char buf[MG_BUF_LEN];
+  va_list ap;
+  int len = 0;
+
+  conn->status_code = status;
+  if (conn->ctx->callbacks.http_error == NULL ||
+      conn->ctx->callbacks.http_error(conn, status)) {
+    buf[0] = '\0';
+
+    // Errors 1xx, 204 and 304 MUST NOT send a body
+    if (status > 199 && status != 204 && status != 304) {
+      len = mg_snprintf(conn, buf, sizeof(buf), "Error %d: %s", status, reason);
+      buf[len++] = '\n';
+
+      va_start(ap, fmt);
+      len += mg_vsnprintf(conn, buf + len, sizeof(buf) - len, fmt, ap);
+      va_end(ap);
+    }
+    DEBUG_TRACE(("[%s]", buf));
+
+    mg_printf(conn, "HTTP/1.1 %d %s\r\n"
+              "Content-Length: %d\r\n"
+              "Connection: %s\r\n\r\n", status, reason, len,
+              suggest_connection_header(conn));
+    conn->num_bytes_sent += mg_printf(conn, "%s", buf);
+  }
+}
+
+#if defined(_WIN32) && !defined(__SYMBIAN32__)
+static int pthread_mutex_init(pthread_mutex_t *mutex, void *unused) {
+  unused = NULL;
+  *mutex = CreateMutex(NULL, FALSE, NULL);
+  return *mutex == NULL ? -1 : 0;
+}
+
+static int pthread_mutex_destroy(pthread_mutex_t *mutex) {
+  return CloseHandle(*mutex) == 0 ? -1 : 0;
+}
+
+static int pthread_mutex_lock(pthread_mutex_t *mutex) {
+  return WaitForSingleObject(*mutex, INFINITE) == WAIT_OBJECT_0? 0 : -1;
+}
+
+static int pthread_mutex_unlock(pthread_mutex_t *mutex) {
+  return ReleaseMutex(*mutex) == 0 ? -1 : 0;
+}
+
+static int pthread_cond_init(pthread_cond_t *cv, const void *unused) {
+  unused = NULL;
+  cv->signal = CreateEvent(NULL, FALSE, FALSE, NULL);
+  cv->broadcast = CreateEvent(NULL, TRUE, FALSE, NULL);
+  return cv->signal != NULL && cv->broadcast != NULL ? 0 : -1;
+}
+
+static int pthread_cond_wait(pthread_cond_t *cv, pthread_mutex_t *mutex) {
+  HANDLE handles[] = {cv->signal, cv->broadcast};
+  ReleaseMutex(*mutex);
+  WaitForMultipleObjects(2, handles, FALSE, INFINITE);
+  return WaitForSingleObject(*mutex, INFINITE) == WAIT_OBJECT_0? 0 : -1;
+}
+
+static int pthread_cond_signal(pthread_cond_t *cv) {
+  return SetEvent(cv->signal) == 0 ? -1 : 0;
+}
+
+static int pthread_cond_broadcast(pthread_cond_t *cv) {
+  // Implementation with PulseEvent() has race condition, see
+  // http://www.cs.wustl.edu/~schmidt/win32-cv-1.html
+  return PulseEvent(cv->broadcast) == 0 ? -1 : 0;
+}
+
+static int pthread_cond_destroy(pthread_cond_t *cv) {
+  return CloseHandle(cv->signal) && CloseHandle(cv->broadcast) ? 0 : -1;
+}
+
+// For Windows, change all slashes to backslashes in path names.
+static void change_slashes_to_backslashes(char *path) {
+  int i;
+
+  for (i = 0; path[i] != '\0'; i++) {
+    if (path[i] == '/')
+      path[i] = '\\';
+    // i > 0 check is to preserve UNC paths, like \\server\file.txt
+    if (path[i] == '\\' && i > 0)
+      while (path[i + 1] == '\\' || path[i + 1] == '/')
+        (void) memmove(path + i + 1,
+            path + i + 2, strlen(path + i + 1));
+  }
+}
+
+// Encode 'path' which is assumed UTF-8 string, into UNICODE string.
+// wbuf and wbuf_len is a target buffer and its length.
+static void to_unicode(const char *path, wchar_t *wbuf, size_t wbuf_len) {
+  char buf[PATH_MAX], buf2[PATH_MAX], *p;
+
+  mg_strlcpy(buf, path, sizeof(buf));
+  change_slashes_to_backslashes(buf);
+
+  // Point p to the end of the file name
+  p = buf + strlen(buf) - 1;
+
+  // Convert to Unicode and back. If doubly-converted string does not
+  // match the original, something is fishy, reject.
+  memset(wbuf, 0, wbuf_len * sizeof(wchar_t));
+  MultiByteToWideChar(CP_UTF8, 0, buf, -1, wbuf, (int) wbuf_len);
+  WideCharToMultiByte(CP_UTF8, 0, wbuf, (int) wbuf_len, buf2, sizeof(buf2),
+                      NULL, NULL);
+  if (strcmp(buf, buf2) != 0) {
+    wbuf[0] = L'\0';
+  }
+}
+
+#if defined(_WIN32_WCE)
+static time_t time(time_t *ptime) {
+  time_t t;
+  SYSTEMTIME st;
+  FILETIME ft;
+
+  GetSystemTime(&st);
+  SystemTimeToFileTime(&st, &ft);
+  t = SYS2UNIX_TIME(ft.dwLowDateTime, ft.dwHighDateTime);
+
+  if (ptime != NULL) {
+    *ptime = t;
+  }
+
+  return t;
+}
+
+static struct tm *localtime(const time_t *ptime, struct tm *ptm) {
+  int64_t t = ((int64_t) *ptime) * RATE_DIFF + EPOCH_DIFF;
+  FILETIME ft, lft;
+  SYSTEMTIME st;
+  TIME_ZONE_INFORMATION tzinfo;
+
+  if (ptm == NULL) {
+    return NULL;
+  }
+
+  * (int64_t *) &ft = t;
+  FileTimeToLocalFileTime(&ft, &lft);
+  FileTimeToSystemTime(&lft, &st);
+  ptm->tm_year = st.wYear - 1900;
+  ptm->tm_mon = st.wMonth - 1;
+  ptm->tm_wday = st.wDayOfWeek;
+  ptm->tm_mday = st.wDay;
+  ptm->tm_hour = st.wHour;
+  ptm->tm_min = st.wMinute;
+  ptm->tm_sec = st.wSecond;
+  ptm->tm_yday = 0; // hope nobody uses this
+  ptm->tm_isdst =
+    GetTimeZoneInformation(&tzinfo) == TIME_ZONE_ID_DAYLIGHT ? 1 : 0;
+
+  return ptm;
+}
+
+static struct tm *gmtime(const time_t *ptime, struct tm *ptm) {
+  // FIXME(lsm): fix this.
+  return localtime(ptime, ptm);
+}
+
+static size_t strftime(char *dst, size_t dst_size, const char *fmt,
+                       const struct tm *tm) {
+  (void) snprintf(dst, dst_size, "implement strftime() for WinCE");
+  return 0;
+}
+#endif
+
+static int mg_rename(const char* oldname, const char* newname) {
+  wchar_t woldbuf[PATH_MAX];
+  wchar_t wnewbuf[PATH_MAX];
+
+  to_unicode(oldname, woldbuf, ARRAY_SIZE(woldbuf));
+  to_unicode(newname, wnewbuf, ARRAY_SIZE(wnewbuf));
+
+  return MoveFileW(woldbuf, wnewbuf) ? 0 : -1;
+}
+
+// Windows happily opens files with some garbage at the end of file name.
+// For example, fopen("a.cgi    ", "r") on Windows successfully opens
+// "a.cgi", despite one would expect an error back.
+// This function returns non-0 if path ends with some garbage.
+static int path_cannot_disclose_cgi(const char *path) {
+  static const char *allowed_last_characters = "_-";
+  int last = path[strlen(path) - 1];
+  return isalnum(last) || strchr(allowed_last_characters, last) != NULL;
+}
+
+static int mg_stat(struct mg_connection *conn, const char *path,
+                   struct file *filep) {
+  wchar_t wbuf[PATH_MAX];
+  WIN32_FILE_ATTRIBUTE_DATA info;
+
+  if (!is_file_in_memory(conn, path, filep)) {
+    to_unicode(path, wbuf, ARRAY_SIZE(wbuf));
+    if (GetFileAttributesExW(wbuf, GetFileExInfoStandard, &info) != 0) {
+      filep->size = MAKEUQUAD(info.nFileSizeLow, info.nFileSizeHigh);
+      filep->modification_time = SYS2UNIX_TIME(
+          info.ftLastWriteTime.dwLowDateTime,
+          info.ftLastWriteTime.dwHighDateTime);
+      filep->is_directory = info.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY;
+      // If file name is fishy, reset the file structure and return error.
+      // Note it is important to reset, not just return the error, cause
+      // functions like is_file_opened() check the struct.
+      if (!filep->is_directory && !path_cannot_disclose_cgi(path)) {
+        memset(filep, 0, sizeof(*filep));
+      }
+    }
+  }
+
+  return filep->membuf != NULL || filep->modification_time != 0;
+}
+
+static int mg_remove(const char *path) {
+  wchar_t wbuf[PATH_MAX];
+  to_unicode(path, wbuf, ARRAY_SIZE(wbuf));
+  return DeleteFileW(wbuf) ? 0 : -1;
+}
+
+static int mg_mkdir(const char *path, int mode) {
+  char buf[PATH_MAX];
+  wchar_t wbuf[PATH_MAX];
+
+  mode = 0; // Unused
+  mg_strlcpy(buf, path, sizeof(buf));
+  change_slashes_to_backslashes(buf);
+
+  (void) MultiByteToWideChar(CP_UTF8, 0, buf, -1, wbuf, ARRAY_SIZE(wbuf));
+
+  return CreateDirectoryW(wbuf, NULL) ? 0 : -1;
+}
+
+// Implementation of POSIX opendir/closedir/readdir for Windows.
+static DIR * opendir(const char *name) {
+  DIR *dir = NULL;
+  wchar_t wpath[PATH_MAX];
+  DWORD attrs;
+
+  if (name == NULL) {
+    SetLastError(ERROR_BAD_ARGUMENTS);
+  } else if ((dir = (DIR *) malloc(sizeof(*dir))) == NULL) {
+    SetLastError(ERROR_NOT_ENOUGH_MEMORY);
+  } else {
+    to_unicode(name, wpath, ARRAY_SIZE(wpath));
+    attrs = GetFileAttributesW(wpath);
+    if (attrs != 0xFFFFFFFF &&
+        ((attrs & FILE_ATTRIBUTE_DIRECTORY) == FILE_ATTRIBUTE_DIRECTORY)) {
+      (void) wcscat(wpath, L"\\*");
+      dir->handle = FindFirstFileW(wpath, &dir->info);
+      dir->result.d_name[0] = '\0';
+    } else {
+      free(dir);
+      dir = NULL;
+    }
+  }
+
+  return dir;
+}
+
+static int closedir(DIR *dir) {
+  int result = 0;
+
+  if (dir != NULL) {
+    if (dir->handle != INVALID_HANDLE_VALUE)
+      result = FindClose(dir->handle) ? 0 : -1;
+
+    free(dir);
+  } else {
+    result = -1;
+    SetLastError(ERROR_BAD_ARGUMENTS);
+  }
+
+  return result;
+}
+
+static struct dirent *readdir(DIR *dir) {
+  struct dirent *result = 0;
+
+  if (dir) {
+    if (dir->handle != INVALID_HANDLE_VALUE) {
+      result = &dir->result;
+      (void) WideCharToMultiByte(CP_UTF8, 0,
+          dir->info.cFileName, -1, result->d_name,
+          sizeof(result->d_name), NULL, NULL);
+
+      if (!FindNextFileW(dir->handle, &dir->info)) {
+        (void) FindClose(dir->handle);
+        dir->handle = INVALID_HANDLE_VALUE;
+      }
+
+    } else {
+      SetLastError(ERROR_FILE_NOT_FOUND);
+    }
+  } else {
+    SetLastError(ERROR_BAD_ARGUMENTS);
+  }
+
+  return result;
+}
+
+#ifndef HAVE_POLL
+static int poll(struct pollfd *pfd, int n, int milliseconds) {
+  struct timeval tv;
+  fd_set set;
+  int i, result;
+
+  tv.tv_sec = milliseconds / 1000;
+  tv.tv_usec = (milliseconds % 1000) * 1000;
+  FD_ZERO(&set);
+
+  for (i = 0; i < n; i++) {
+    FD_SET((SOCKET) pfd[i].fd, &set);
+    pfd[i].revents = 0;
+  }
+
+  if ((result = select(0, &set, NULL, NULL, &tv)) > 0) {
+    for (i = 0; i < n; i++) {
+      if (FD_ISSET(pfd[i].fd, &set)) {
+        pfd[i].revents = POLLIN;
+      }
+    }
+  }
+
+  return result;
+}
+#endif // HAVE_POLL
+
+#define set_close_on_exec(x) // No FD_CLOEXEC on Windows
+
+int mg_start_thread(mg_thread_func_t f, void *p) {
+  return _beginthread((void (__cdecl *)(void *)) f, 0, p) == -1L ? -1 : 0;
+}
+
+static HANDLE dlopen(const char *dll_name, int flags) {
+  wchar_t wbuf[PATH_MAX];
+  flags = 0; // Unused
+  to_unicode(dll_name, wbuf, ARRAY_SIZE(wbuf));
+  return LoadLibraryW(wbuf);
+}
+
+#if !defined(NO_CGI)
+#define SIGKILL 0
+static int kill(pid_t pid, int sig_num) {
+  (void) TerminateProcess(pid, sig_num);
+  (void) CloseHandle(pid);
+  return 0;
+}
+
+static void trim_trailing_whitespaces(char *s) {
+  char *e = s + strlen(s) - 1;
+  while (e > s && isspace(* (unsigned char *) e)) {
+    *e-- = '\0';
+  }
+}
+
+static pid_t spawn_process(struct mg_connection *conn, const char *prog,
+                           char *envblk, char *envp[], int fd_stdin,
+                           int fd_stdout, const char *dir) {
+  HANDLE me;
+  char *p, *interp, full_interp[PATH_MAX], full_dir[PATH_MAX],
+       cmdline[PATH_MAX], buf[PATH_MAX];
+  struct file file = STRUCT_FILE_INITIALIZER;
+  STARTUPINFOA si = { sizeof(si) };
+  PROCESS_INFORMATION pi = { 0 };
+
+  envp = NULL; // Unused
+
+  // TODO(lsm): redirect CGI errors to the error log file
+  si.dwFlags = STARTF_USESTDHANDLES | STARTF_USESHOWWINDOW;
+  si.wShowWindow = SW_HIDE;
+
+  me = GetCurrentProcess();
+  DuplicateHandle(me, (HANDLE) _get_osfhandle(fd_stdin), me,
+                  &si.hStdInput, 0, TRUE, DUPLICATE_SAME_ACCESS);
+  DuplicateHandle(me, (HANDLE) _get_osfhandle(fd_stdout), me,
+                  &si.hStdOutput, 0, TRUE, DUPLICATE_SAME_ACCESS);
+
+  // If CGI file is a script, try to read the interpreter line
+  interp = conn->ctx->config[CGI_INTERPRETER];
+  if (interp == NULL) {
+    buf[0] = buf[1] = '\0';
+
+    // Read the first line of the script into the buffer
+    snprintf(cmdline, sizeof(cmdline), "%s%c%s", dir, '/', prog);
+    if (mg_fopen(conn, cmdline, "r", &file)) {
+      p = (char *) file.membuf;
+      mg_fgets(buf, sizeof(buf), &file, &p);
+      mg_fclose(&file);
+      buf[sizeof(buf) - 1] = '\0';
+    }
+
+    if (buf[0] == '#' && buf[1] == '!') {
+      trim_trailing_whitespaces(buf + 2);
+    } else {
+      buf[2] = '\0';
+    }
+    interp = buf + 2;
+  }
+
+  if (interp[0] != '\0') {
+    GetFullPathNameA(interp, sizeof(full_interp), full_interp, NULL);
+    interp = full_interp;
+  }
+  GetFullPathNameA(dir, sizeof(full_dir), full_dir, NULL);
+
+  mg_snprintf(conn, cmdline, sizeof(cmdline), "%s%s%s\\%s",
+              interp, interp[0] == '\0' ? "" : " ", full_dir, prog);
+
+  DEBUG_TRACE(("Running [%s]", cmdline));
+  if (CreateProcessA(NULL, cmdline, NULL, NULL, TRUE,
+        CREATE_NEW_PROCESS_GROUP, envblk, NULL, &si, &pi) == 0) {
+    cry(conn, "%s: CreateProcess(%s): %d",
+        __func__, cmdline, ERRNO);
+    pi.hProcess = (pid_t) -1;
+  }
+
+  // Always close these to prevent handle leakage.
+  (void) close(fd_stdin);
+  (void) close(fd_stdout);
+
+  (void) CloseHandle(si.hStdOutput);
+  (void) CloseHandle(si.hStdInput);
+  (void) CloseHandle(pi.hThread);
+
+  return (pid_t) pi.hProcess;
+}
+#endif // !NO_CGI
+
+static int set_non_blocking_mode(SOCKET sock) {
+  unsigned long on = 1;
+  return ioctlsocket(sock, FIONBIO, &on);
+}
+
+#else
+static int mg_stat(struct mg_connection *conn, const char *path,
+                   struct file *filep) {
+  struct stat st;
+
+  if (!is_file_in_memory(conn, path, filep) && !stat(path, &st)) {
+    filep->size = st.st_size;
+    filep->modification_time = st.st_mtime;
+    filep->is_directory = S_ISDIR(st.st_mode);
+  } else {
+    filep->modification_time = (time_t) 0;
+  }
+
+  return filep->membuf != NULL || filep->modification_time != (time_t) 0;
+}
+
+static void set_close_on_exec(int fd) {
+  fcntl(fd, F_SETFD, FD_CLOEXEC);
+}
+
+int mg_start_thread(mg_thread_func_t func, void *param) {
+  pthread_t thread_id;
+  pthread_attr_t attr;
+
+  (void) pthread_attr_init(&attr);
+  (void) pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED);
+  // TODO(lsm): figure out why mongoose dies on Linux if next line is enabled
+  // (void) pthread_attr_setstacksize(&attr, sizeof(struct mg_connection) * 5);
+
+  return pthread_create(&thread_id, &attr, func, param);
+}
+
+#ifndef NO_CGI
+static pid_t spawn_process(struct mg_connection *conn, const char *prog,
+                           char *envblk, char *envp[], int fd_stdin,
+                           int fd_stdout, const char *dir) {
+  pid_t pid;
+  const char *interp;
+
+  (void) envblk;
+
+  if ((pid = fork()) == -1) {
+    // Parent
+    send_http_error(conn, 500, http_500_error, "fork(): %s", strerror(ERRNO));
+  } else if (pid == 0) {
+    // Child
+    if (chdir(dir) != 0) {
+      cry(conn, "%s: chdir(%s): %s", __func__, dir, strerror(ERRNO));
+    } else if (dup2(fd_stdin, 0) == -1) {
+      cry(conn, "%s: dup2(%d, 0): %s", __func__, fd_stdin, strerror(ERRNO));
+    } else if (dup2(fd_stdout, 1) == -1) {
+      cry(conn, "%s: dup2(%d, 1): %s", __func__, fd_stdout, strerror(ERRNO));
+    } else {
+      (void) dup2(fd_stdout, 2);
+      (void) close(fd_stdin);
+      (void) close(fd_stdout);
+
+      // After exec, all signal handlers are restored to their default values,
+      // with one exception of SIGCHLD. According to POSIX.1-2001 and Linux's
+      // implementation, SIGCHLD's handler will leave unchanged after exec
+      // if it was set to be ignored. Restore it to default action.
+      signal(SIGCHLD, SIG_DFL);
+
+      interp = conn->ctx->config[CGI_INTERPRETER];
+      if (interp == NULL) {
+        (void) execle(prog, prog, NULL, envp);
+        cry(conn, "%s: execle(%s): %s", __func__, prog, strerror(ERRNO));
+      } else {
+        (void) execle(interp, interp, prog, NULL, envp);
+        cry(conn, "%s: execle(%s %s): %s", __func__, interp, prog,
+            strerror(ERRNO));
+      }
+    }
+    exit(EXIT_FAILURE);
+  }
+
+  // Parent. Close stdio descriptors
+  (void) close(fd_stdin);
+  (void) close(fd_stdout);
+
+  return pid;
+}
+#endif // !NO_CGI
+
+static int set_non_blocking_mode(SOCKET sock) {
+  int flags;
+
+  flags = fcntl(sock, F_GETFL, 0);
+  (void) fcntl(sock, F_SETFL, flags | O_NONBLOCK);
+
+  return 0;
+}
+#endif // _WIN32
+
+// Write data to the IO channel - opened file descriptor, socket or SSL
+// descriptor. Return number of bytes written.
+static int64_t push(FILE *fp, SOCKET sock, SSL *ssl, const char *buf,
+                    int64_t len) {
+  int64_t sent;
+  int n, k;
+
+  sent = 0;
+  while (sent < len) {
+
+    // How many bytes we send in this iteration
+    k = len - sent > INT_MAX ? INT_MAX : (int) (len - sent);
+
+#ifndef NO_SSL
+    if (ssl != NULL) {
+      n = SSL_write(ssl, buf + sent, k);
+    } else
+#endif
+      if (fp != NULL) {
+      n = (int) fwrite(buf + sent, 1, (size_t) k, fp);
+      if (ferror(fp))
+        n = -1;
+    } else {
+      n = send(sock, buf + sent, (size_t) k, MSG_NOSIGNAL);
+    }
+
+    if (n <= 0)
+      break;
+
+    sent += n;
+  }
+
+  return sent;
+}
+
+// Read from IO channel - opened file descriptor, socket, or SSL descriptor.
+// Return negative value on error, or number of bytes read on success.
+static int pull(FILE *fp, struct mg_connection *conn, char *buf, int len) {
+  int nread;
+
+  if (fp != NULL) {
+    // Use read() instead of fread(), because if we're reading from the CGI
+    // pipe, fread() may block until IO buffer is filled up. We cannot afford
+    // to block and must pass all read bytes immediately to the client.
+    nread = read(fileno(fp), buf, (size_t) len);
+#ifndef NO_SSL
+  } else if (conn->ssl != NULL) {
+    nread = SSL_read(conn->ssl, buf, len);
+#endif
+  } else {
+    nread = recv(conn->client.sock, buf, (size_t) len, 0);
+  }
+
+  return conn->ctx->stop_flag ? -1 : nread;
+}
+
+int mg_read(struct mg_connection *conn, void *buf, size_t len) {
+  int n, buffered_len, nread;
+  const char *body;
+
+  nread = 0;
+  if (conn->consumed_content < conn->content_len) {
+    // Adjust number of bytes to read.
+    int64_t to_read = conn->content_len - conn->consumed_content;
+    if (to_read < (int64_t) len) {
+      len = (size_t) to_read;
+    }
+
+    // Return buffered data
+    body = conn->buf + conn->request_len + conn->consumed_content;
+    buffered_len = &conn->buf[conn->data_len] - body;
+    if (buffered_len > 0) {
+      if (len < (size_t) buffered_len) {
+        buffered_len = (int) len;
+      }
+      memcpy(buf, body, (size_t) buffered_len);
+      len -= buffered_len;
+      conn->consumed_content += buffered_len;
+      nread += buffered_len;
+      buf = (char *) buf + buffered_len;
+    }
+
+    // We have returned all buffered data. Read new data from the remote socket.
+    while (len > 0) {
+      n = pull(NULL, conn, (char *) buf, (int) len);
+      if (n < 0) {
+        nread = n;  // Propagate the error
+        break;
+      } else if (n == 0) {
+        break;  // No more data to read
+      } else {
+        buf = (char *) buf + n;
+        conn->consumed_content += n;
+        nread += n;
+        len -= n;
+      }
+    }
+  }
+  return nread;
+}
+
+int mg_write(struct mg_connection *conn, const void *buf, size_t len) {
+  time_t now;
+  int64_t n, total, allowed;
+
+  if (conn->throttle > 0) {
+    if ((now = time(NULL)) != conn->last_throttle_time) {
+      conn->last_throttle_time = now;
+      conn->last_throttle_bytes = 0;
+    }
+    allowed = conn->throttle - conn->last_throttle_bytes;
+    if (allowed > (int64_t) len) {
+      allowed = len;
+    }
+    if ((total = push(NULL, conn->client.sock, conn->ssl, (const char *) buf,
+                      (int64_t) allowed)) == allowed) {
+      buf = (char *) buf + total;
+      conn->last_throttle_bytes += total;
+      while (total < (int64_t) len && conn->ctx->stop_flag == 0) {
+        allowed = conn->throttle > (int64_t) len - total ?
+          (int64_t) len - total : conn->throttle;
+        if ((n = push(NULL, conn->client.sock, conn->ssl, (const char *) buf,
+                      (int64_t) allowed)) != allowed) {
+          break;
+        }
+        sleep(1);
+        conn->last_throttle_bytes = allowed;
+        conn->last_throttle_time = time(NULL);
+        buf = (char *) buf + n;
+        total += n;
+      }
+    }
+  } else {
+    total = push(NULL, conn->client.sock, conn->ssl, (const char *) buf,
+                 (int64_t) len);
+  }
+  return (int) total;
+}
+
+// Print message to buffer. If buffer is large enough to hold the message,
+// return buffer. If buffer is to small, allocate large enough buffer on heap,
+// and return allocated buffer.
+static int alloc_vprintf(char **buf, size_t size, const char *fmt, va_list ap) {
+  va_list ap_copy;
+  int len;
+
+  // Windows is not standard-compliant, and vsnprintf() returns -1 if
+  // buffer is too small. Also, older versions of msvcrt.dll do not have
+  // _vscprintf().  However, if size is 0, vsnprintf() behaves correctly.
+  // Therefore, we make two passes: on first pass, get required message length.
+  // On second pass, actually print the message.
+  va_copy(ap_copy, ap);
+  len = vsnprintf(NULL, 0, fmt, ap_copy);
+
+  if (len > (int) size &&
+      (size = len + 1) > 0 &&
+      (*buf = (char *) malloc(size)) == NULL) {
+    len = -1;  // Allocation failed, mark failure
+  } else {
+    va_copy(ap_copy, ap);
+    vsnprintf(*buf, size, fmt, ap_copy);
+  }
+
+  return len;
+}
+
+int mg_vprintf(struct mg_connection *conn, const char *fmt, va_list ap) {
+  char mem[MG_BUF_LEN], *buf = mem;
+  int len;
+
+  if ((len = alloc_vprintf(&buf, sizeof(mem), fmt, ap)) > 0) {
+    len = mg_write(conn, buf, (size_t) len);
+  }
+  if (buf != mem && buf != NULL) {
+    free(buf);
+  }
+
+  return len;
+}
+
+int mg_printf(struct mg_connection *conn, const char *fmt, ...) {
+  va_list ap;
+  va_start(ap, fmt);
+  return mg_vprintf(conn, fmt, ap);
+}
+
+// URL-decode input buffer into destination buffer.
+// 0-terminate the destination buffer. Return the length of decoded data.
+// form-url-encoded data differs from URI encoding in a way that it
+// uses '+' as character for space, see RFC 1866 section 8.2.1
+// http://ftp.ics.uci.edu/pub/ietf/html/rfc1866.txt
+static int url_decode(const char *src, int src_len, char *dst,
+                      int dst_len, int is_form_url_encoded) {
+  int i, j, a, b;
+#define HEXTOI(x) (isdigit(x) ? x - '0' : x - 'W')
+
+  for (i = j = 0; i < src_len && j < dst_len - 1; i++, j++) {
+    if (src[i] == '%' &&
+        isxdigit(* (const unsigned char *) (src + i + 1)) &&
+        isxdigit(* (const unsigned char *) (src + i + 2))) {
+      a = tolower(* (const unsigned char *) (src + i + 1));
+      b = tolower(* (const unsigned char *) (src + i + 2));
+      dst[j] = (char) ((HEXTOI(a) << 4) | HEXTOI(b));
+      i += 2;
+    } else if (is_form_url_encoded && src[i] == '+') {
+      dst[j] = ' ';
+    } else {
+      dst[j] = src[i];
+    }
+  }
+
+  dst[j] = '\0'; // Null-terminate the destination
+
+  return i >= src_len ? j : -1;
+}
+
+int mg_get_var(const char *data, size_t data_len, const char *name,
+               char *dst, size_t dst_len) {
+  const char *p, *e, *s;
+  size_t name_len;
+  int len;
+
+  if (dst == NULL || dst_len == 0) {
+    len = -2;
+  } else if (data == NULL || name == NULL || data_len == 0) {
+    len = -1;
+    dst[0] = '\0';
+  } else {
+    name_len = strlen(name);
+    e = data + data_len;
+    len = -1;
+    dst[0] = '\0';
+
+    // data is "var1=val1&var2=val2...". Find variable first
+    for (p = data; p + name_len < e; p++) {
+      if ((p == data || p[-1] == '&') && p[name_len] == '=' &&
+          !mg_strncasecmp(name, p, name_len)) {
+
+        // Point p to variable value
+        p += name_len + 1;
+
+        // Point s to the end of the value
+        s = (const char *) memchr(p, '&', (size_t)(e - p));
+        if (s == NULL) {
+          s = e;
+        }
+        assert(s >= p);
+
+        // Decode variable into destination buffer
+        len = url_decode(p, (size_t)(s - p), dst, dst_len, 1);
+
+        // Redirect error code from -1 to -2 (destination buffer too small).
+        if (len == -1) {
+          len = -2;
+        }
+        break;
+      }
+    }
+  }
+
+  return len;
+}
+
+int mg_get_cookie(const struct mg_connection *conn, const char *cookie_name,
+                  char *dst, size_t dst_size) {
+  const char *s, *p, *end;
+  int name_len, len = -1;
+
+  if (dst == NULL || dst_size == 0) {
+    len = -2;
+  } else if (cookie_name == NULL ||
+             (s = mg_get_header(conn, "Cookie")) == NULL) {
+    len = -1;
+    dst[0] = '\0';
+  } else {
+    name_len = (int) strlen(cookie_name);
+    end = s + strlen(s);
+    dst[0] = '\0';
+
+    for (; (s = strstr(s, cookie_name)) != NULL; s += name_len) {
+      if (s[name_len] == '=') {
+        s += name_len + 1;
+        if ((p = strchr(s, ' ')) == NULL)
+          p = end;
+        if (p[-1] == ';')
+          p--;
+        if (*s == '"' && p[-1] == '"' && p > s + 1) {
+          s++;
+          p--;
+        }
+        if ((size_t) (p - s) < dst_size) {
+          len = p - s;
+          mg_strlcpy(dst, s, (size_t) len + 1);
+        } else {
+          len = -2;
+        }
+        break;
+      }
+    }
+  }
+  return len;
+}
+
+static void convert_uri_to_file_name(struct mg_connection *conn, char *buf,
+                                     size_t buf_len, struct file *filep) {
+  struct vec a, b;
+  const char *rewrite, *uri = conn->request_info.uri;
+  char *p;
+  int match_len;
+
+  // Using buf_len - 1 because memmove() for PATH_INFO may shift part
+  // of the path one byte on the right.
+  mg_snprintf(conn, buf, buf_len - 1, "%s%s", conn->ctx->config[DOCUMENT_ROOT],
+              uri);
+
+  rewrite = conn->ctx->config[REWRITE];
+  while ((rewrite = next_option(rewrite, &a, &b)) != NULL) {
+    if ((match_len = match_prefix(a.ptr, a.len, uri)) > 0) {
+      mg_snprintf(conn, buf, buf_len - 1, "%.*s%s", (int) b.len, b.ptr,
+                  uri + match_len);
+      break;
+    }
+  }
+
+  if (!mg_stat(conn, buf, filep)) {
+    // Support PATH_INFO for CGI scripts.
+    for (p = buf + strlen(buf); p > buf + 1; p--) {
+      if (*p == '/') {
+        *p = '\0';
+        if (match_prefix(conn->ctx->config[CGI_EXTENSIONS],
+                         strlen(conn->ctx->config[CGI_EXTENSIONS]), buf) > 0 &&
+            mg_stat(conn, buf, filep)) {
+          // Shift PATH_INFO block one character right, e.g.
+          //  "/x.cgi/foo/bar\x00" => "/x.cgi\x00/foo/bar\x00"
+          // conn->path_info is pointing to the local variable "path" declared
+          // in handle_request(), so PATH_INFO is not valid after
+          // handle_request returns.
+          conn->path_info = p + 1;
+          memmove(p + 2, p + 1, strlen(p + 1) + 1);  // +1 is for trailing \0
+          p[1] = '/';
+          break;
+        } else {
+          *p = '/';
+        }
+      }
+    }
+  }
+}
+
+// Check whether full request is buffered. Return:
+//   -1  if request is malformed
+//    0  if request is not yet fully buffered
+//   >0  actual request length, including last \r\n\r\n
+static int get_request_len(const char *buf, int buflen) {
+  const char *s, *e;
+  int len = 0;
+
+  for (s = buf, e = s + buflen - 1; len <= 0 && s < e; s++)
+    // Control characters are not allowed but >=128 is.
+    if (!isprint(* (const unsigned char *) s) && *s != '\r' &&
+        *s != '\n' && * (const unsigned char *) s < 128) {
+      len = -1;
+      break;  // [i_a] abort scan as soon as one malformed character is found;
+              // don't let subsequent \r\n\r\n win us over anyhow
+    } else if (s[0] == '\n' && s[1] == '\n') {
+      len = (int) (s - buf) + 2;
+    } else if (s[0] == '\n' && &s[1] < e &&
+        s[1] == '\r' && s[2] == '\n') {
+      len = (int) (s - buf) + 3;
+    }
+
+  return len;
+}
+
+// Convert month to the month number. Return -1 on error, or month number
+static int get_month_index(const char *s) {
+  size_t i;
+
+  for (i = 0; i < ARRAY_SIZE(month_names); i++)
+    if (!strcmp(s, month_names[i]))
+      return (int) i;
+
+  return -1;
+}
+
+static int num_leap_years(int year) {
+  return year / 4 - year / 100 + year / 400;
+}
+
+// Parse UTC date-time string, and return the corresponding time_t value.
+static time_t parse_date_string(const char *datetime) {
+  static const unsigned short days_before_month[] = {
+    0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334
+  };
+  char month_str[32];
+  int second, minute, hour, day, month, year, leap_days, days;
+  time_t result = (time_t) 0;
+
+  if (((sscanf(datetime, "%d/%3s/%d %d:%d:%d",
+               &day, month_str, &year, &hour, &minute, &second) == 6) ||
+       (sscanf(datetime, "%d %3s %d %d:%d:%d",
+               &day, month_str, &year, &hour, &minute, &second) == 6) ||
+       (sscanf(datetime, "%*3s, %d %3s %d %d:%d:%d",
+               &day, month_str, &year, &hour, &minute, &second) == 6) ||
+       (sscanf(datetime, "%d-%3s-%d %d:%d:%d",
+               &day, month_str, &year, &hour, &minute, &second) == 6)) &&
+      year > 1970 &&
+      (month = get_month_index(month_str)) != -1) {
+    leap_days = num_leap_years(year) - num_leap_years(1970);
+    year -= 1970;
+    days = year * 365 + days_before_month[month] + (day - 1) + leap_days;
+    result = days * 24 * 3600 + hour * 3600 + minute * 60 + second;
+  }
+
+  return result;
+}
+
+// Protect against directory disclosure attack by removing '..',
+// excessive '/' and '\' characters
+static void remove_double_dots_and_double_slashes(char *s) {
+  char *p = s;
+
+  while (*s != '\0') {
+    *p++ = *s++;
+    if (s[-1] == '/' || s[-1] == '\\') {
+      // Skip all following slashes, backslashes and double-dots
+      while (s[0] != '\0') {
+        if (s[0] == '/' || s[0] == '\\') {
+          s++;
+        } else if (s[0] == '.' && s[1] == '.') {
+          s += 2;
+        } else {
+          break;
+        }
+      }
+    }
+  }
+  *p = '\0';
+}
+
+static const struct {
+  const char *extension;
+  size_t ext_len;
+  const char *mime_type;
+} builtin_mime_types[] = {
+  {".html", 5, "text/html"},
+  {".htm", 4, "text/html"},
+  {".shtm", 5, "text/html"},
+  {".shtml", 6, "text/html"},
+  {".css", 4, "text/css"},
+  {".js",  3, "application/x-javascript"},
+  {".ico", 4, "image/x-icon"},
+  {".gif", 4, "image/gif"},
+  {".jpg", 4, "image/jpeg"},
+  {".jpeg", 5, "image/jpeg"},
+  {".png", 4, "image/png"},
+  {".svg", 4, "image/svg+xml"},
+  {".txt", 4, "text/plain"},
+  {".torrent", 8, "application/x-bittorrent"},
+  {".wav", 4, "audio/x-wav"},
+  {".mp3", 4, "audio/x-mp3"},
+  {".mid", 4, "audio/mid"},
+  {".m3u", 4, "audio/x-mpegurl"},
+  {".ogg", 4, "audio/ogg"},
+  {".ram", 4, "audio/x-pn-realaudio"},
+  {".xml", 4, "text/xml"},
+  {".json",  5, "text/json"},
+  {".xslt", 5, "application/xml"},
+  {".xsl", 4, "application/xml"},
+  {".ra",  3, "audio/x-pn-realaudio"},
+  {".doc", 4, "application/msword"},
+  {".exe", 4, "application/octet-stream"},
+  {".zip", 4, "application/x-zip-compressed"},
+  {".xls", 4, "application/excel"},
+  {".tgz", 4, "application/x-tar-gz"},
+  {".tar", 4, "application/x-tar"},
+  {".gz",  3, "application/x-gunzip"},
+  {".arj", 4, "application/x-arj-compressed"},
+  {".rar", 4, "application/x-arj-compressed"},
+  {".rtf", 4, "application/rtf"},
+  {".pdf", 4, "application/pdf"},
+  {".swf", 4, "application/x-shockwave-flash"},
+  {".mpg", 4, "video/mpeg"},
+  {".webm", 5, "video/webm"},
+  {".mpeg", 5, "video/mpeg"},
+  {".mp4", 4, "video/mp4"},
+  {".m4v", 4, "video/x-m4v"},
+  {".asf", 4, "video/x-ms-asf"},
+  {".avi", 4, "video/x-msvideo"},
+  {".bmp", 4, "image/bmp"},
+  {NULL,  0, NULL}
+};
+
+const char *mg_get_builtin_mime_type(const char *path) {
+  const char *ext;
+  size_t i, path_len;
+
+  path_len = strlen(path);
+
+  for (i = 0; builtin_mime_types[i].extension != NULL; i++) {
+    ext = path + (path_len - builtin_mime_types[i].ext_len);
+    if (path_len > builtin_mime_types[i].ext_len &&
+        mg_strcasecmp(ext, builtin_mime_types[i].extension) == 0) {
+      return builtin_mime_types[i].mime_type;
+    }
+  }
+
+  return "text/plain";
+}
+
+// Look at the "path" extension and figure what mime type it has.
+// Store mime type in the vector.
+static void get_mime_type(struct mg_context *ctx, const char *path,
+                          struct vec *vec) {
+  struct vec ext_vec, mime_vec;
+  const char *list, *ext;
+  size_t path_len;
+
+  path_len = strlen(path);
+
+  // Scan user-defined mime types first, in case user wants to
+  // override default mime types.
+  list = ctx->config[EXTRA_MIME_TYPES];
+  while ((list = next_option(list, &ext_vec, &mime_vec)) != NULL) {
+    // ext now points to the path suffix
+    ext = path + path_len - ext_vec.len;
+    if (mg_strncasecmp(ext, ext_vec.ptr, ext_vec.len) == 0) {
+      *vec = mime_vec;
+      return;
+    }
+  }
+
+  vec->ptr = mg_get_builtin_mime_type(path);
+  vec->len = strlen(vec->ptr);
+}
+
+static int is_big_endian(void) {
+  static const int n = 1;
+  return ((char *) &n)[0] == 0;
+}
+
+#ifndef HAVE_MD5
+typedef struct MD5Context {
+  uint32_t buf[4];
+  uint32_t bits[2];
+  unsigned char in[64];
+} MD5_CTX;
+
+static void byteReverse(unsigned char *buf, unsigned longs) {
+  uint32_t t;
+
+  // Forrest: MD5 expect LITTLE_ENDIAN, swap if BIG_ENDIAN
+  if (is_big_endian()) {
+    do {
+      t = (uint32_t) ((unsigned) buf[3] << 8 | buf[2]) << 16 |
+        ((unsigned) buf[1] << 8 | buf[0]);
+      * (uint32_t *) buf = t;
+      buf += 4;
+    } while (--longs);
+  }
+}
+
+#define F1(x, y, z) (z ^ (x & (y ^ z)))
+#define F2(x, y, z) F1(z, x, y)
+#define F3(x, y, z) (x ^ y ^ z)
+#define F4(x, y, z) (y ^ (x | ~z))
+
+#define MD5STEP(f, w, x, y, z, data, s) \
+  ( w += f(x, y, z) + data,  w = w<<s | w>>(32-s),  w += x )
+
+// Start MD5 accumulation.  Set bit count to 0 and buffer to mysterious
+// initialization constants.
+static void MD5Init(MD5_CTX *ctx) {
+  ctx->buf[0] = 0x67452301;
+  ctx->buf[1] = 0xefcdab89;
+  ctx->buf[2] = 0x98badcfe;
+  ctx->buf[3] = 0x10325476;
+
+  ctx->bits[0] = 0;
+  ctx->bits[1] = 0;
+}
+
+static void MD5Transform(uint32_t buf[4], uint32_t const in[16]) {
+  register uint32_t a, b, c, d;
+
+  a = buf[0];
+  b = buf[1];
+  c = buf[2];
+  d = buf[3];
+
+  MD5STEP(F1, a, b, c, d, in[0] + 0xd76aa478, 7);
+  MD5STEP(F1, d, a, b, c, in[1] + 0xe8c7b756, 12);
+  MD5STEP(F1, c, d, a, b, in[2] + 0x242070db, 17);
+  MD5STEP(F1, b, c, d, a, in[3] + 0xc1bdceee, 22);
+  MD5STEP(F1, a, b, c, d, in[4] + 0xf57c0faf, 7);
+  MD5STEP(F1, d, a, b, c, in[5] + 0x4787c62a, 12);
+  MD5STEP(F1, c, d, a, b, in[6] + 0xa8304613, 17);
+  MD5STEP(F1, b, c, d, a, in[7] + 0xfd469501, 22);
+  MD5STEP(F1, a, b, c, d, in[8] + 0x698098d8, 7);
+  MD5STEP(F1, d, a, b, c, in[9] + 0x8b44f7af, 12);
+  MD5STEP(F1, c, d, a, b, in[10] + 0xffff5bb1, 17);
+  MD5STEP(F1, b, c, d, a, in[11] + 0x895cd7be, 22);
+  MD5STEP(F1, a, b, c, d, in[12] + 0x6b901122, 7);
+  MD5STEP(F1, d, a, b, c, in[13] + 0xfd987193, 12);
+  MD5STEP(F1, c, d, a, b, in[14] + 0xa679438e, 17);
+  MD5STEP(F1, b, c, d, a, in[15] + 0x49b40821, 22);
+
+  MD5STEP(F2, a, b, c, d, in[1] + 0xf61e2562, 5);
+  MD5STEP(F2, d, a, b, c, in[6] + 0xc040b340, 9);
+  MD5STEP(F2, c, d, a, b, in[11] + 0x265e5a51, 14);
+  MD5STEP(F2, b, c, d, a, in[0] + 0xe9b6c7aa, 20);
+  MD5STEP(F2, a, b, c, d, in[5] + 0xd62f105d, 5);
+  MD5STEP(F2, d, a, b, c, in[10] + 0x02441453, 9);
+  MD5STEP(F2, c, d, a, b, in[15] + 0xd8a1e681, 14);
+  MD5STEP(F2, b, c, d, a, in[4] + 0xe7d3fbc8, 20);
+  MD5STEP(F2, a, b, c, d, in[9] + 0x21e1cde6, 5);
+  MD5STEP(F2, d, a, b, c, in[14] + 0xc33707d6, 9);
+  MD5STEP(F2, c, d, a, b, in[3] + 0xf4d50d87, 14);
+  MD5STEP(F2, b, c, d, a, in[8] + 0x455a14ed, 20);
+  MD5STEP(F2, a, b, c, d, in[13] + 0xa9e3e905, 5);
+  MD5STEP(F2, d, a, b, c, in[2] + 0xfcefa3f8, 9);
+  MD5STEP(F2, c, d, a, b, in[7] + 0x676f02d9, 14);
+  MD5STEP(F2, b, c, d, a, in[12] + 0x8d2a4c8a, 20);
+
+  MD5STEP(F3, a, b, c, d, in[5] + 0xfffa3942, 4);
+  MD5STEP(F3, d, a, b, c, in[8] + 0x8771f681, 11);
+  MD5STEP(F3, c, d, a, b, in[11] + 0x6d9d6122, 16);
+  MD5STEP(F3, b, c, d, a, in[14] + 0xfde5380c, 23);
+  MD5STEP(F3, a, b, c, d, in[1] + 0xa4beea44, 4);
+  MD5STEP(F3, d, a, b, c, in[4] + 0x4bdecfa9, 11);
+  MD5STEP(F3, c, d, a, b, in[7] + 0xf6bb4b60, 16);
+  MD5STEP(F3, b, c, d, a, in[10] + 0xbebfbc70, 23);
+  MD5STEP(F3, a, b, c, d, in[13] + 0x289b7ec6, 4);
+  MD5STEP(F3, d, a, b, c, in[0] + 0xeaa127fa, 11);
+  MD5STEP(F3, c, d, a, b, in[3] + 0xd4ef3085, 16);
+  MD5STEP(F3, b, c, d, a, in[6] + 0x04881d05, 23);
+  MD5STEP(F3, a, b, c, d, in[9] + 0xd9d4d039, 4);
+  MD5STEP(F3, d, a, b, c, in[12] + 0xe6db99e5, 11);
+  MD5STEP(F3, c, d, a, b, in[15] + 0x1fa27cf8, 16);
+  MD5STEP(F3, b, c, d, a, in[2] + 0xc4ac5665, 23);
+
+  MD5STEP(F4, a, b, c, d, in[0] + 0xf4292244, 6);
+  MD5STEP(F4, d, a, b, c, in[7] + 0x432aff97, 10);
+  MD5STEP(F4, c, d, a, b, in[14] + 0xab9423a7, 15);
+  MD5STEP(F4, b, c, d, a, in[5] + 0xfc93a039, 21);
+  MD5STEP(F4, a, b, c, d, in[12] + 0x655b59c3, 6);
+  MD5STEP(F4, d, a, b, c, in[3] + 0x8f0ccc92, 10);
+  MD5STEP(F4, c, d, a, b, in[10] + 0xffeff47d, 15);
+  MD5STEP(F4, b, c, d, a, in[1] + 0x85845dd1, 21);
+  MD5STEP(F4, a, b, c, d, in[8] + 0x6fa87e4f, 6);
+  MD5STEP(F4, d, a, b, c, in[15] + 0xfe2ce6e0, 10);
+  MD5STEP(F4, c, d, a, b, in[6] + 0xa3014314, 15);
+  MD5STEP(F4, b, c, d, a, in[13] + 0x4e0811a1, 21);
+  MD5STEP(F4, a, b, c, d, in[4] + 0xf7537e82, 6);
+  MD5STEP(F4, d, a, b, c, in[11] + 0xbd3af235, 10);
+  MD5STEP(F4, c, d, a, b, in[2] + 0x2ad7d2bb, 15);
+  MD5STEP(F4, b, c, d, a, in[9] + 0xeb86d391, 21);
+
+  buf[0] += a;
+  buf[1] += b;
+  buf[2] += c;
+  buf[3] += d;
+}
+
+static void MD5Update(MD5_CTX *ctx, unsigned char const *buf, unsigned len) {
+  uint32_t t;
+
+  t = ctx->bits[0];
+  if ((ctx->bits[0] = t + ((uint32_t) len << 3)) < t)
+    ctx->bits[1]++;
+  ctx->bits[1] += len >> 29;
+
+  t = (t >> 3) & 0x3f;
+
+  if (t) {
+    unsigned char *p = (unsigned char *) ctx->in + t;
+
+    t = 64 - t;
+    if (len < t) {
+      memcpy(p, buf, len);
+      return;
+    }
+    memcpy(p, buf, t);
+    byteReverse(ctx->in, 16);
+    MD5Transform(ctx->buf, (uint32_t *) ctx->in);
+    buf += t;
+    len -= t;
+  }
+
+  while (len >= 64) {
+    memcpy(ctx->in, buf, 64);
+    byteReverse(ctx->in, 16);
+    MD5Transform(ctx->buf, (uint32_t *) ctx->in);
+    buf += 64;
+    len -= 64;
+  }
+
+  memcpy(ctx->in, buf, len);
+}
+
+static void MD5Final(unsigned char digest[16], MD5_CTX *ctx) {
+  unsigned count;
+  unsigned char *p;
+
+  count = (ctx->bits[0] >> 3) & 0x3F;
+
+  p = ctx->in + count;
+  *p++ = 0x80;
+  count = 64 - 1 - count;
+  if (count < 8) {
+    memset(p, 0, count);
+    byteReverse(ctx->in, 16);
+    MD5Transform(ctx->buf, (uint32_t *) ctx->in);
+    memset(ctx->in, 0, 56);
+  } else {
+    memset(p, 0, count - 8);
+  }
+  byteReverse(ctx->in, 14);
+
+  ((uint32_t *) ctx->in)[14] = ctx->bits[0];
+  ((uint32_t *) ctx->in)[15] = ctx->bits[1];
+
+  MD5Transform(ctx->buf, (uint32_t *) ctx->in);
+  byteReverse((unsigned char *) ctx->buf, 4);
+  memcpy(digest, ctx->buf, 16);
+  memset((char *) ctx, 0, sizeof(*ctx));
+}
+#endif // !HAVE_MD5
+
+// Stringify binary data. Output buffer must be twice as big as input,
+// because each byte takes 2 bytes in string representation
+static void bin2str(char *to, const unsigned char *p, size_t len) {
+  static const char *hex = "0123456789abcdef";
+
+  for (; len--; p++) {
+    *to++ = hex[p[0] >> 4];
+    *to++ = hex[p[0] & 0x0f];
+  }
+  *to = '\0';
+}
+
+// Return stringified MD5 hash for list of strings. Buffer must be 33 bytes.
+void mg_md5(char buf[33], ...) {
+  unsigned char hash[16];
+  const char *p;
+  va_list ap;
+  MD5_CTX ctx;
+
+  MD5Init(&ctx);
+
+  va_start(ap, buf);
+  while ((p = va_arg(ap, const char *)) != NULL) {
+    MD5Update(&ctx, (const unsigned char *) p, (unsigned) strlen(p));
+  }
+  va_end(ap);
+
+  MD5Final(hash, &ctx);
+  bin2str(buf, hash, sizeof(hash));
+}
+
+// Check the user's password, return 1 if OK
+static int check_password(const char *method, const char *ha1, const char *uri,
+                          const char *nonce, const char *nc, const char *cnonce,
+                          const char *qop, const char *response) {
+  char ha2[32 + 1], expected_response[32 + 1];
+
+  // Some of the parameters may be NULL
+  if (method == NULL || nonce == NULL || nc == NULL || cnonce == NULL ||
+      qop == NULL || response == NULL) {
+    return 0;
+  }
+
+  // NOTE(lsm): due to a bug in MSIE, we do not compare the URI
+  // TODO(lsm): check for authentication timeout
+  if (// strcmp(dig->uri, c->ouri) != 0 ||
+      strlen(response) != 32
+      // || now - strtoul(dig->nonce, NULL, 10) > 3600
+      ) {
+    return 0;
+  }
+
+  mg_md5(ha2, method, ":", uri, NULL);
+  mg_md5(expected_response, ha1, ":", nonce, ":", nc,
+      ":", cnonce, ":", qop, ":", ha2, NULL);
+
+  return mg_strcasecmp(response, expected_response) == 0;
+}
+
+// Use the global passwords file, if specified by auth_gpass option,
+// or search for .htpasswd in the requested directory.
+static void open_auth_file(struct mg_connection *conn, const char *path,
+                           struct file *filep) {
+  char name[PATH_MAX];
+  const char *p, *e, *gpass = conn->ctx->config[GLOBAL_PASSWORDS_FILE];
+
+  if (gpass != NULL) {
+    // Use global passwords file
+    if (!mg_fopen(conn, gpass, "r", filep)) {
+      cry(conn, "fopen(%s): %s", gpass, strerror(ERRNO));
+    }
+  } else if (mg_stat(conn, path, filep) && filep->is_directory) {
+    mg_snprintf(conn, name, sizeof(name), "%s%c%s",
+                path, '/', PASSWORDS_FILE_NAME);
+    mg_fopen(conn, name, "r", filep);
+  } else {
+     // Try to find .htpasswd in requested directory.
+    for (p = path, e = p + strlen(p) - 1; e > p; e--)
+      if (e[0] == '/')
+        break;
+    mg_snprintf(conn, name, sizeof(name), "%.*s%c%s",
+                (int) (e - p), p, '/', PASSWORDS_FILE_NAME);
+    mg_fopen(conn, name, "r", filep);
+  }
+}
+
+// Parsed Authorization header
+struct ah {
+  char *user, *uri, *cnonce, *response, *qop, *nc, *nonce;
+};
+
+// Return 1 on success. Always initializes the ah structure.
+static int parse_auth_header(struct mg_connection *conn, char *buf,
+                             size_t buf_size, struct ah *ah) {
+  char *name, *value, *s;
+  const char *auth_header;
+
+  (void) memset(ah, 0, sizeof(*ah));
+  if ((auth_header = mg_get_header(conn, "Authorization")) == NULL ||
+      mg_strncasecmp(auth_header, "Digest ", 7) != 0) {
+    return 0;
+  }
+
+  // Make modifiable copy of the auth header
+  (void) mg_strlcpy(buf, auth_header + 7, buf_size);
+  s = buf;
+
+  // Parse authorization header
+  for (;;) {
+    // Gobble initial spaces
+    while (isspace(* (unsigned char *) s)) {
+      s++;
+    }
+    name = skip_quoted(&s, "=", " ", 0);
+    // Value is either quote-delimited, or ends at first comma or space.
+    if (s[0] == '\"') {
+      s++;
+      value = skip_quoted(&s, "\"", " ", '\\');
+      if (s[0] == ',') {
+        s++;
+      }
+    } else {
+      value = skip_quoted(&s, ", ", " ", 0);  // IE uses commas, FF uses spaces
+    }
+    if (*name == '\0') {
+      break;
+    }
+
+    if (!strcmp(name, "username")) {
+      ah->user = value;
+    } else if (!strcmp(name, "cnonce")) {
+      ah->cnonce = value;
+    } else if (!strcmp(name, "response")) {
+      ah->response = value;
+    } else if (!strcmp(name, "uri")) {
+      ah->uri = value;
+    } else if (!strcmp(name, "qop")) {
+      ah->qop = value;
+    } else if (!strcmp(name, "nc")) {
+      ah->nc = value;
+    } else if (!strcmp(name, "nonce")) {
+      ah->nonce = value;
+    }
+  }
+
+  // CGI needs it as REMOTE_USER
+  if (ah->user != NULL) {
+    conn->request_info.remote_user = mg_strdup(ah->user);
+  } else {
+    return 0;
+  }
+
+  return 1;
+}
+
+static char *mg_fgets(char *buf, size_t size, struct file *filep, char **p) {
+  char *eof;
+  size_t len;
+
+  if (filep->membuf != NULL && *p != NULL) {
+    eof = memchr(*p, '\n', &filep->membuf[filep->size] - *p);
+    len = (size_t) (eof - *p) > size - 1 ? size - 1 : (size_t) (eof - *p);
+    memcpy(buf, *p, len);
+    buf[len] = '\0';
+    *p = eof;
+    return eof;
+  } else if (filep->fp != NULL) {
+    return fgets(buf, size, filep->fp);
+  } else {
+    return NULL;
+  }
+}
+
+// Authorize against the opened passwords file. Return 1 if authorized.
+static int authorize(struct mg_connection *conn, struct file *filep) {
+  struct ah ah;
+  char line[256], f_user[256], ha1[256], f_domain[256], buf[MG_BUF_LEN], *p;
+
+  if (!parse_auth_header(conn, buf, sizeof(buf), &ah)) {
+    return 0;
+  }
+
+  // Loop over passwords file
+  p = (char *) filep->membuf;
+  while (mg_fgets(line, sizeof(line), filep, &p) != NULL) {
+    if (sscanf(line, "%[^:]:%[^:]:%s", f_user, f_domain, ha1) != 3) {
+      continue;
+    }
+
+    if (!strcmp(ah.user, f_user) &&
+        !strcmp(conn->ctx->config[AUTHENTICATION_DOMAIN], f_domain))
+      return check_password(conn->request_info.request_method, ha1, ah.uri,
+                            ah.nonce, ah.nc, ah.cnonce, ah.qop, ah.response);
+  }
+
+  return 0;
+}
+
+// Return 1 if request is authorised, 0 otherwise.
+static int check_authorization(struct mg_connection *conn, const char *path) {
+  char fname[PATH_MAX];
+  struct vec uri_vec, filename_vec;
+  const char *list;
+  struct file file = STRUCT_FILE_INITIALIZER;
+  int authorized = 1;
+
+  list = conn->ctx->config[PROTECT_URI];
+  while ((list = next_option(list, &uri_vec, &filename_vec)) != NULL) {
+    if (!memcmp(conn->request_info.uri, uri_vec.ptr, uri_vec.len)) {
+      mg_snprintf(conn, fname, sizeof(fname), "%.*s",
+                  (int) filename_vec.len, filename_vec.ptr);
+      if (!mg_fopen(conn, fname, "r", &file)) {
+        cry(conn, "%s: cannot open %s: %s", __func__, fname, strerror(errno));
+      }
+      break;
+    }
+  }
+
+  if (!is_file_opened(&file)) {
+    open_auth_file(conn, path, &file);
+  }
+
+  if (is_file_opened(&file)) {
+    authorized = authorize(conn, &file);
+    mg_fclose(&file);
+  }
+
+  return authorized;
+}
+
+static void send_authorization_request(struct mg_connection *conn) {
+  conn->status_code = 401;
+  mg_printf(conn,
+            "HTTP/1.1 401 Unauthorized\r\n"
+            "Content-Length: 0\r\n"
+            "WWW-Authenticate: Digest qop=\"auth\", "
+            "realm=\"%s\", nonce=\"%lu\"\r\n\r\n",
+            conn->ctx->config[AUTHENTICATION_DOMAIN],
+            (unsigned long) time(NULL));
+}
+
+static int is_authorized_for_put(struct mg_connection *conn) {
+  struct file file = STRUCT_FILE_INITIALIZER;
+  const char *passfile = conn->ctx->config[PUT_DELETE_PASSWORDS_FILE];
+  int ret = 0;
+
+  if (passfile != NULL && mg_fopen(conn, passfile, "r", &file)) {
+    ret = authorize(conn, &file);
+    mg_fclose(&file);
+  }
+
+  return ret;
+}
+
+int mg_modify_passwords_file(const char *fname, const char *domain,
+                             const char *user, const char *pass) {
+  int found;
+  char line[512], u[512], d[512], ha1[33], tmp[PATH_MAX];
+  FILE *fp, *fp2;
+
+  found = 0;
+  fp = fp2 = NULL;
+
+  // Regard empty password as no password - remove user record.
+  if (pass != NULL && pass[0] == '\0') {
+    pass = NULL;
+  }
+
+  (void) snprintf(tmp, sizeof(tmp), "%s.tmp", fname);
+
+  // Create the file if does not exist
+  if ((fp = fopen(fname, "a+")) != NULL) {
+    (void) fclose(fp);
+  }
+
+  // Open the given file and temporary file
+  if ((fp = fopen(fname, "r")) == NULL) {
+    return 0;
+  } else if ((fp2 = fopen(tmp, "w+")) == NULL) {
+    fclose(fp);
+    return 0;
+  }
+
+  // Copy the stuff to temporary file
+  while (fgets(line, sizeof(line), fp) != NULL) {
+    if (sscanf(line, "%[^:]:%[^:]:%*s", u, d) != 2) {
+      continue;
+    }
+
+    if (!strcmp(u, user) && !strcmp(d, domain)) {
+      found++;
+      if (pass != NULL) {
+        mg_md5(ha1, user, ":", domain, ":", pass, NULL);
+        fprintf(fp2, "%s:%s:%s\n", user, domain, ha1);
+      }
+    } else {
+      fprintf(fp2, "%s", line);
+    }
+  }
+
+  // If new user, just add it
+  if (!found && pass != NULL) {
+    mg_md5(ha1, user, ":", domain, ":", pass, NULL);
+    fprintf(fp2, "%s:%s:%s\n", user, domain, ha1);
+  }
+
+  // Close files
+  fclose(fp);
+  fclose(fp2);
+
+  // Put the temp file in place of real file
+  remove(fname);
+  rename(tmp, fname);
+
+  return 1;
+}
+
+struct de {
+  struct mg_connection *conn;
+  char *file_name;
+  struct file file;
+};
+
+static void url_encode(const char *src, char *dst, size_t dst_len) {
+  static const char *dont_escape = "._-$,;~()";
+  static const char *hex = "0123456789abcdef";
+  const char *end = dst + dst_len - 1;
+
+  for (; *src != '\0' && dst < end; src++, dst++) {
+    if (isalnum(*(const unsigned char *) src) ||
+        strchr(dont_escape, * (const unsigned char *) src) != NULL) {
+      *dst = *src;
+    } else if (dst + 2 < end) {
+      dst[0] = '%';
+      dst[1] = hex[(* (const unsigned char *) src) >> 4];
+      dst[2] = hex[(* (const unsigned char *) src) & 0xf];
+      dst += 2;
+    }
+  }
+
+  *dst = '\0';
+}
+
+static void print_dir_entry(struct de *de) {
+  char size[64], mod[64], href[PATH_MAX];
+
+  if (de->file.is_directory) {
+    mg_snprintf(de->conn, size, sizeof(size), "%s", "[DIRECTORY]");
+  } else {
+     // We use (signed) cast below because MSVC 6 compiler cannot
+     // convert unsigned __int64 to double. Sigh.
+    if (de->file.size < 1024) {
+      mg_snprintf(de->conn, size, sizeof(size), "%d", (int) de->file.size);
+    } else if (de->file.size < 0x100000) {
+      mg_snprintf(de->conn, size, sizeof(size),
+                  "%.1fk", (double) de->file.size / 1024.0);
+    } else if (de->file.size < 0x40000000) {
+      mg_snprintf(de->conn, size, sizeof(size),
+                  "%.1fM", (double) de->file.size / 1048576);
+    } else {
+      mg_snprintf(de->conn, size, sizeof(size),
+                  "%.1fG", (double) de->file.size / 1073741824);
+    }
+  }
+  strftime(mod, sizeof(mod), "%d-%b-%Y %H:%M",
+           localtime(&de->file.modification_time));
+  url_encode(de->file_name, href, sizeof(href));
+  de->conn->num_bytes_sent += mg_printf(de->conn,
+      "<tr><td><a href=\"%s%s%s\">%s%s</a></td>"
+      "<td>&nbsp;%s</td><td>&nbsp;&nbsp;%s</td></tr>\n",
+      de->conn->request_info.uri, href, de->file.is_directory ? "/" : "",
+      de->file_name, de->file.is_directory ? "/" : "", mod, size);
+}
+
+// This function is called from send_directory() and used for
+// sorting directory entries by size, or name, or modification time.
+// On windows, __cdecl specification is needed in case if project is built
+// with __stdcall convention. qsort always requires __cdels callback.
+static int WINCDECL compare_dir_entries(const void *p1, const void *p2) {
+  const struct de *a = (const struct de *) p1, *b = (const struct de *) p2;
+  const char *query_string = a->conn->request_info.query_string;
+  int cmp_result = 0;
+
+  if (query_string == NULL) {
+    query_string = "na";
+  }
+
+  if (a->file.is_directory && !b->file.is_directory) {
+    return -1;  // Always put directories on top
+  } else if (!a->file.is_directory && b->file.is_directory) {
+    return 1;   // Always put directories on top
+  } else if (*query_string == 'n') {
+    cmp_result = strcmp(a->file_name, b->file_name);
+  } else if (*query_string == 's') {
+    cmp_result = a->file.size == b->file.size ? 0 :
+      a->file.size > b->file.size ? 1 : -1;
+  } else if (*query_string == 'd') {
+    cmp_result = a->file.modification_time == b->file.modification_time ? 0 :
+      a->file.modification_time > b->file.modification_time ? 1 : -1;
+  }
+
+  return query_string[1] == 'd' ? -cmp_result : cmp_result;
+}
+
+static int must_hide_file(struct mg_connection *conn, const char *path) {
+  const char *pw_pattern = "**" PASSWORDS_FILE_NAME "$";
+  const char *pattern = conn->ctx->config[HIDE_FILES];
+  return match_prefix(pw_pattern, strlen(pw_pattern), path) > 0 ||
+    (pattern != NULL && match_prefix(pattern, strlen(pattern), path) > 0);
+}
+
+static int scan_directory(struct mg_connection *conn, const char *dir,
+                          void *data, void (*cb)(struct de *, void *)) {
+  char path[PATH_MAX];
+  struct dirent *dp;
+  DIR *dirp;
+  struct de de;
+
+  if ((dirp = opendir(dir)) == NULL) {
+    return 0;
+  } else {
+    de.conn = conn;
+
+    while ((dp = readdir(dirp)) != NULL) {
+      // Do not show current dir and hidden files
+      if (!strcmp(dp->d_name, ".") ||
+          !strcmp(dp->d_name, "..") ||
+          must_hide_file(conn, dp->d_name)) {
+        continue;
+      }
+
+      mg_snprintf(conn, path, sizeof(path), "%s%c%s", dir, '/', dp->d_name);
+
+      // If we don't memset stat structure to zero, mtime will have
+      // garbage and strftime() will segfault later on in
+      // print_dir_entry(). memset is required only if mg_stat()
+      // fails. For more details, see
+      // http://code.google.com/p/mongoose/issues/detail?id=79
+      memset(&de.file, 0, sizeof(de.file));
+      mg_stat(conn, path, &de.file);
+
+      de.file_name = dp->d_name;
+      cb(&de, data);
+    }
+    (void) closedir(dirp);
+  }
+  return 1;
+}
+
+struct dir_scan_data {
+  struct de *entries;
+  int num_entries;
+  int arr_size;
+};
+
+static void dir_scan_callback(struct de *de, void *data) {
+  struct dir_scan_data *dsd = (struct dir_scan_data *) data;
+
+  if (dsd->entries == NULL || dsd->num_entries >= dsd->arr_size) {
+    dsd->arr_size *= 2;
+    dsd->entries = (struct de *) realloc(dsd->entries, dsd->arr_size *
+                                         sizeof(dsd->entries[0]));
+  }
+  if (dsd->entries == NULL) {
+    // TODO(lsm): propagate an error to the caller
+    dsd->num_entries = 0;
+  } else {
+    dsd->entries[dsd->num_entries].file_name = mg_strdup(de->file_name);
+    dsd->entries[dsd->num_entries].file = de->file;
+    dsd->entries[dsd->num_entries].conn = de->conn;
+    dsd->num_entries++;
+  }
+}
+
+static void handle_directory_request(struct mg_connection *conn,
+                                     const char *dir) {
+  int i, sort_direction;
+  struct dir_scan_data data = { NULL, 0, 128 };
+
+  if (!scan_directory(conn, dir, &data, dir_scan_callback)) {
+    send_http_error(conn, 500, "Cannot open directory",
+                    "Error: opendir(%s): %s", dir, strerror(ERRNO));
+    return;
+  }
+
+  sort_direction = conn->request_info.query_string != NULL &&
+    conn->request_info.query_string[1] == 'd' ? 'a' : 'd';
+
+  conn->must_close = 1;
+  mg_printf(conn, "%s",
+            "HTTP/1.1 200 OK\r\n"
+            "Connection: close\r\n"
+            "Content-Type: text/html; charset=utf-8\r\n\r\n");
+
+  conn->num_bytes_sent += mg_printf(conn,
+      "<html><head><title>Index of %s</title>"
+      "<style>th {text-align: left;}</style></head>"
+      "<body><h1>Index of %s</h1><pre><table cellpadding=\"0\">"
+      "<tr><th><a href=\"?n%c\">Name</a></th>"
+      "<th><a href=\"?d%c\">Modified</a></th>"
+      "<th><a href=\"?s%c\">Size</a></th></tr>"
+      "<tr><td colspan=\"3\"><hr></td></tr>",
+      conn->request_info.uri, conn->request_info.uri,
+      sort_direction, sort_direction, sort_direction);
+
+  // Print first entry - link to a parent directory
+  conn->num_bytes_sent += mg_printf(conn,
+      "<tr><td><a href=\"%s%s\">%s</a></td>"
+      "<td>&nbsp;%s</td><td>&nbsp;&nbsp;%s</td></tr>\n",
+      conn->request_info.uri, "..", "Parent directory", "-", "-");
+
+  // Sort and print directory entries
+  qsort(data.entries, (size_t) data.num_entries, sizeof(data.entries[0]),
+        compare_dir_entries);
+  for (i = 0; i < data.num_entries; i++) {
+    print_dir_entry(&data.entries[i]);
+    free(data.entries[i].file_name);
+  }
+  free(data.entries);
+
+  conn->num_bytes_sent += mg_printf(conn, "%s", "</table></body></html>");
+  conn->status_code = 200;
+}
+
+// Send len bytes from the opened file to the client.
+static void send_file_data(struct mg_connection *conn, struct file *filep,
+                           int64_t offset, int64_t len) {
+  char buf[MG_BUF_LEN];
+  int to_read, num_read, num_written;
+
+  if (len > 0 && filep->membuf != NULL && filep->size > 0) {
+    if (len > filep->size - offset) {
+      len = filep->size - offset;
+    }
+    mg_write(conn, filep->membuf + offset, (size_t) len);
+  } else if (len > 0 && filep->fp != NULL) {
+    fseeko(filep->fp, offset, SEEK_SET);
+    while (len > 0) {
+      // Calculate how much to read from the file in the buffer
+      to_read = sizeof(buf);
+      if ((int64_t) to_read > len) {
+        to_read = (int) len;
+      }
+
+      // Read from file, exit the loop on error
+      if ((num_read = fread(buf, 1, (size_t) to_read, filep->fp)) <= 0) {
+        break;
+      }
+
+      // Send read bytes to the client, exit the loop on error
+      if ((num_written = mg_write(conn, buf, (size_t) num_read)) != num_read) {
+        break;
+      }
+
+      // Both read and were successful, adjust counters
+      conn->num_bytes_sent += num_written;
+      len -= num_written;
+    }
+  }
+}
+
+static int parse_range_header(const char *header, int64_t *a, int64_t *b) {
+  return sscanf(header, "bytes=%" INT64_FMT "-%" INT64_FMT, a, b);
+}
+
+static void gmt_time_string(char *buf, size_t buf_len, time_t *t) {
+  strftime(buf, buf_len, "%a, %d %b %Y %H:%M:%S GMT", gmtime(t));
+}
+
+static void construct_etag(char *buf, size_t buf_len,
+                           const struct file *filep) {
+  snprintf(buf, buf_len, "\"%lx.%" INT64_FMT "\"",
+           (unsigned long) filep->modification_time, filep->size);
+}
+
+static void fclose_on_exec(struct file *filep) {
+  if (filep != NULL && filep->fp != NULL) {
+#ifndef _WIN32
+    fcntl(fileno(filep->fp), F_SETFD, FD_CLOEXEC);
+#endif
+  }
+}
+
+static void handle_file_request(struct mg_connection *conn, const char *path,
+                                struct file *filep) {
+  char date[64], lm[64], etag[64], range[64];
+  const char *msg = "OK", *hdr;
+  time_t curtime = time(NULL);
+  int64_t cl, r1, r2;
+  struct vec mime_vec;
+  int n;
+
+  get_mime_type(conn->ctx, path, &mime_vec);
+  cl = filep->size;
+  conn->status_code = 200;
+  range[0] = '\0';
+
+  if (!mg_fopen(conn, path, "rb", filep)) {
+    send_http_error(conn, 500, http_500_error,
+                    "fopen(%s): %s", path, strerror(ERRNO));
+    return;
+  }
+  fclose_on_exec(filep);
+
+  // If Range: header specified, act accordingly
+  r1 = r2 = 0;
+  hdr = mg_get_header(conn, "Range");
+  if (hdr != NULL && (n = parse_range_header(hdr, &r1, &r2)) > 0 &&
+      r1 >= 0 && r2 > 0) {
+    conn->status_code = 206;
+    cl = n == 2 ? (r2 > cl ? cl : r2) - r1 + 1: cl - r1;
+    mg_snprintf(conn, range, sizeof(range),
+                "Content-Range: bytes "
+                "%" INT64_FMT "-%"
+                INT64_FMT "/%" INT64_FMT "\r\n",
+                r1, r1 + cl - 1, filep->size);
+    msg = "Partial Content";
+  }
+
+  // Prepare Etag, Date, Last-Modified headers. Must be in UTC, according to
+  // http://www.w3.org/Protocols/rfc2616/rfc2616-sec3.html#sec3.3
+  gmt_time_string(date, sizeof(date), &curtime);
+  gmt_time_string(lm, sizeof(lm), &filep->modification_time);
+  construct_etag(etag, sizeof(etag), filep);
+
+  (void) mg_printf(conn,
+      "HTTP/1.1 %d %s\r\n"
+      "Date: %s\r\n"
+      "Last-Modified: %s\r\n"
+      "Etag: %s\r\n"
+      "Content-Type: %.*s\r\n"
+      "Content-Length: %" INT64_FMT "\r\n"
+      "Connection: %s\r\n"
+      "Accept-Ranges: bytes\r\n"
+      "%s\r\n",
+      conn->status_code, msg, date, lm, etag, (int) mime_vec.len,
+      mime_vec.ptr, cl, suggest_connection_header(conn), range);
+
+  if (strcmp(conn->request_info.request_method, "HEAD") != 0) {
+    send_file_data(conn, filep, r1, cl);
+  }
+  mg_fclose(filep);
+}
+
+void mg_send_file(struct mg_connection *conn, const char *path) {
+  struct file file = STRUCT_FILE_INITIALIZER;
+  if (mg_stat(conn, path, &file)) {
+    handle_file_request(conn, path, &file);
+  } else {
+    send_http_error(conn, 404, "Not Found", "%s", "File not found");
+  }
+}
+
+
+// Parse HTTP headers from the given buffer, advance buffer to the point
+// where parsing stopped.
+static void parse_http_headers(char **buf, struct mg_request_info *ri) {
+  int i;
+
+  for (i = 0; i < (int) ARRAY_SIZE(ri->http_headers); i++) {
+    ri->http_headers[i].name = skip_quoted(buf, ":", " ", 0);
+    ri->http_headers[i].value = skip(buf, "\r\n");
+    if (ri->http_headers[i].name[0] == '\0')
+      break;
+    ri->num_headers = i + 1;
+  }
+}
+
+static int is_valid_http_method(const char *method) {
+  return !strcmp(method, "GET") || !strcmp(method, "POST") ||
+    !strcmp(method, "HEAD") || !strcmp(method, "CONNECT") ||
+    !strcmp(method, "PUT") || !strcmp(method, "DELETE") ||
+    !strcmp(method, "OPTIONS") || !strcmp(method, "PROPFIND");
+}
+
+// Parse HTTP request, fill in mg_request_info structure.
+// This function modifies the buffer by NUL-terminating
+// HTTP request components, header names and header values.
+static int parse_http_message(char *buf, int len, struct mg_request_info *ri) {
+  int is_request, request_length = get_request_len(buf, len);
+  if (request_length > 0) {
+    // Reset attributes. DO NOT TOUCH is_ssl, remote_ip, remote_port
+    ri->remote_user = ri->request_method = ri->uri = ri->http_version = NULL;
+    ri->num_headers = 0;
+
+    buf[request_length - 1] = '\0';
+
+    // RFC says that all initial whitespaces should be ingored
+    while (*buf != '\0' && isspace(* (unsigned char *) buf)) {
+      buf++;
+    }
+    ri->request_method = skip(&buf, " ");
+    ri->uri = skip(&buf, " ");
+    ri->http_version = skip(&buf, "\r\n");
+    if (((is_request = is_valid_http_method(ri->request_method)) &&
+         memcmp(ri->http_version, "HTTP/", 5) != 0) ||
+        (!is_request && memcmp(ri->request_method, "HTTP/", 5)) != 0) {
+      request_length = -1;
+    } else {
+      if (is_request) {
+        ri->http_version += 5;
+      }
+      parse_http_headers(&buf, ri);
+    }
+  }
+  return request_length;
+}
+
+// Keep reading the input (either opened file descriptor fd, or socket sock,
+// or SSL descriptor ssl) into buffer buf, until \r\n\r\n appears in the
+// buffer (which marks the end of HTTP request). Buffer buf may already
+// have some data. The length of the data is stored in nread.
+// Upon every read operation, increase nread by the number of bytes read.
+static int read_request(FILE *fp, struct mg_connection *conn,
+                        char *buf, int bufsiz, int *nread) {
+  int request_len, n = 0;
+
+  request_len = get_request_len(buf, *nread);
+  while (*nread < bufsiz && request_len == 0 &&
+         (n = pull(fp, conn, buf + *nread, bufsiz - *nread)) > 0) {
+    *nread += n;
+    assert(*nread <= bufsiz);
+    request_len = get_request_len(buf, *nread);
+  }
+
+  return request_len <= 0 && n <= 0 ? -1 : request_len;
+}
+
+// For given directory path, substitute it to valid index file.
+// Return 0 if index file has been found, -1 if not found.
+// If the file is found, it's stats is returned in stp.
+static int substitute_index_file(struct mg_connection *conn, char *path,
+                                 size_t path_len, struct file *filep) {
+  const char *list = conn->ctx->config[INDEX_FILES];
+  struct file file = STRUCT_FILE_INITIALIZER;
+  struct vec filename_vec;
+  size_t n = strlen(path);
+  int found = 0;
+
+  // The 'path' given to us points to the directory. Remove all trailing
+  // directory separator characters from the end of the path, and
+  // then append single directory separator character.
+  while (n > 0 && path[n - 1] == '/') {
+    n--;
+  }
+  path[n] = '/';
+
+  // Traverse index files list. For each entry, append it to the given
+  // path and see if the file exists. If it exists, break the loop
+  while ((list = next_option(list, &filename_vec, NULL)) != NULL) {
+
+    // Ignore too long entries that may overflow path buffer
+    if (filename_vec.len > path_len - (n + 2))
+      continue;
+
+    // Prepare full path to the index file
+    mg_strlcpy(path + n + 1, filename_vec.ptr, filename_vec.len + 1);
+
+    // Does it exist?
+    if (mg_stat(conn, path, &file)) {
+      // Yes it does, break the loop
+      *filep = file;
+      found = 1;
+      break;
+    }
+  }
+
+  // If no index file exists, restore directory path
+  if (!found) {
+    path[n] = '\0';
+  }
+
+  return found;
+}
+
+// Return True if we should reply 304 Not Modified.
+static int is_not_modified(const struct mg_connection *conn,
+                           const struct file *filep) {
+  char etag[64];
+  const char *ims = mg_get_header(conn, "If-Modified-Since");
+  const char *inm = mg_get_header(conn, "If-None-Match");
+  construct_etag(etag, sizeof(etag), filep);
+  return (inm != NULL && !mg_strcasecmp(etag, inm)) ||
+    (ims != NULL && filep->modification_time <= parse_date_string(ims));
+}
+
+static int forward_body_data(struct mg_connection *conn, FILE *fp,
+                             SOCKET sock, SSL *ssl) {
+  const char *expect, *body;
+  char buf[MG_BUF_LEN];
+  int to_read, nread, buffered_len, success = 0;
+
+  expect = mg_get_header(conn, "Expect");
+  assert(fp != NULL);
+
+  if (conn->content_len == -1) {
+    send_http_error(conn, 411, "Length Required", "%s", "");
+  } else if (expect != NULL && mg_strcasecmp(expect, "100-continue")) {
+    send_http_error(conn, 417, "Expectation Failed", "%s", "");
+  } else {
+    if (expect != NULL) {
+      (void) mg_printf(conn, "%s", "HTTP/1.1 100 Continue\r\n\r\n");
+    }
+
+    body = conn->buf + conn->request_len + conn->consumed_content;
+    buffered_len = &conn->buf[conn->data_len] - body;
+    assert(buffered_len >= 0);
+    assert(conn->consumed_content == 0);
+
+    if (buffered_len > 0) {
+      if ((int64_t) buffered_len > conn->content_len) {
+        buffered_len = (int) conn->content_len;
+      }
+      push(fp, sock, ssl, body, (int64_t) buffered_len);
+      conn->consumed_content += buffered_len;
+    }
+
+    nread = 0;
+    while (conn->consumed_content < conn->content_len) {
+      to_read = sizeof(buf);
+      if ((int64_t) to_read > conn->content_len - conn->consumed_content) {
+        to_read = (int) (conn->content_len - conn->consumed_content);
+      }
+      nread = pull(NULL, conn, buf, to_read);
+      if (nread <= 0 || push(fp, sock, ssl, buf, nread) != nread) {
+        break;
+      }
+      conn->consumed_content += nread;
+    }
+
+    if (conn->consumed_content == conn->content_len) {
+      success = nread >= 0;
+    }
+
+    // Each error code path in this function must send an error
+    if (!success) {
+      send_http_error(conn, 577, http_500_error, "%s", "");
+    }
+  }
+
+  return success;
+}
+
+#if !defined(NO_CGI)
+// This structure helps to create an environment for the spawned CGI program.
+// Environment is an array of "VARIABLE=VALUE\0" ASCIIZ strings,
+// last element must be NULL.
+// However, on Windows there is a requirement that all these VARIABLE=VALUE\0
+// strings must reside in a contiguous buffer. The end of the buffer is
+// marked by two '\0' characters.
+// We satisfy both worlds: we create an envp array (which is vars), all
+// entries are actually pointers inside buf.
+struct cgi_env_block {
+  struct mg_connection *conn;
+  char buf[CGI_ENVIRONMENT_SIZE]; // Environment buffer
+  int len; // Space taken
+  char *vars[MAX_CGI_ENVIR_VARS]; // char **envp
+  int nvars; // Number of variables
+};
+
+static char *addenv(struct cgi_env_block *block,
+                    PRINTF_FORMAT_STRING(const char *fmt), ...)
+  PRINTF_ARGS(2, 3);
+
+// Append VARIABLE=VALUE\0 string to the buffer, and add a respective
+// pointer into the vars array.
+static char *addenv(struct cgi_env_block *block, const char *fmt, ...) {
+  int n, space;
+  char *added;
+  va_list ap;
+
+  // Calculate how much space is left in the buffer
+  space = sizeof(block->buf) - block->len - 2;
+  assert(space >= 0);
+
+  // Make a pointer to the free space int the buffer
+  added = block->buf + block->len;
+
+  // Copy VARIABLE=VALUE\0 string into the free space
+  va_start(ap, fmt);
+  n = mg_vsnprintf(block->conn, added, (size_t) space, fmt, ap);
+  va_end(ap);
+
+  // Make sure we do not overflow buffer and the envp array
+  if (n > 0 && n + 1 < space &&
+      block->nvars < (int) ARRAY_SIZE(block->vars) - 2) {
+    // Append a pointer to the added string into the envp array
+    block->vars[block->nvars++] = added;
+    // Bump up used length counter. Include \0 terminator
+    block->len += n + 1;
+  } else {
+    cry(block->conn, "%s: CGI env buffer truncated for [%s]", __func__, fmt);
+  }
+
+  return added;
+}
+
+static void prepare_cgi_environment(struct mg_connection *conn,
+                                    const char *prog,
+                                    struct cgi_env_block *blk) {
+  const char *s, *slash;
+  struct vec var_vec;
+  char *p, src_addr[20];
+  int  i;
+
+  blk->len = blk->nvars = 0;
+  blk->conn = conn;
+  sockaddr_to_string(src_addr, sizeof(src_addr), &conn->client.rsa);
+
+  addenv(blk, "SERVER_NAME=%s", conn->ctx->config[AUTHENTICATION_DOMAIN]);
+  addenv(blk, "SERVER_ROOT=%s", conn->ctx->config[DOCUMENT_ROOT]);
+  addenv(blk, "DOCUMENT_ROOT=%s", conn->ctx->config[DOCUMENT_ROOT]);
+
+  // Prepare the environment block
+  addenv(blk, "%s", "GATEWAY_INTERFACE=CGI/1.1");
+  addenv(blk, "%s", "SERVER_PROTOCOL=HTTP/1.1");
+  addenv(blk, "%s", "REDIRECT_STATUS=200"); // For PHP
+
+  // TODO(lsm): fix this for IPv6 case
+  addenv(blk, "SERVER_PORT=%d", ntohs(conn->client.lsa.sin.sin_port));
+
+  addenv(blk, "REQUEST_METHOD=%s", conn->request_info.request_method);
+  addenv(blk, "REMOTE_ADDR=%s", src_addr);
+  addenv(blk, "REMOTE_PORT=%d", conn->request_info.remote_port);
+  addenv(blk, "REQUEST_URI=%s", conn->request_info.uri);
+
+  // SCRIPT_NAME
+  assert(conn->request_info.uri[0] == '/');
+  slash = strrchr(conn->request_info.uri, '/');
+  if ((s = strrchr(prog, '/')) == NULL)
+    s = prog;
+  addenv(blk, "SCRIPT_NAME=%.*s%s", (int) (slash - conn->request_info.uri),
+         conn->request_info.uri, s);
+
+  addenv(blk, "SCRIPT_FILENAME=%s", prog);
+  addenv(blk, "PATH_TRANSLATED=%s", prog);
+  addenv(blk, "HTTPS=%s", conn->ssl == NULL ? "off" : "on");
+
+  if ((s = mg_get_header(conn, "Content-Type")) != NULL)
+    addenv(blk, "CONTENT_TYPE=%s", s);
+
+  if (conn->request_info.query_string != NULL)
+    addenv(blk, "QUERY_STRING=%s", conn->request_info.query_string);
+
+  if ((s = mg_get_header(conn, "Content-Length")) != NULL)
+    addenv(blk, "CONTENT_LENGTH=%s", s);
+
+  if ((s = getenv("PATH")) != NULL)
+    addenv(blk, "PATH=%s", s);
+
+  if (conn->path_info != NULL) {
+    addenv(blk, "PATH_INFO=%s", conn->path_info);
+  }
+
+#if defined(_WIN32)
+  if ((s = getenv("COMSPEC")) != NULL) {
+    addenv(blk, "COMSPEC=%s", s);
+  }
+  if ((s = getenv("SYSTEMROOT")) != NULL) {
+    addenv(blk, "SYSTEMROOT=%s", s);
+  }
+  if ((s = getenv("SystemDrive")) != NULL) {
+    addenv(blk, "SystemDrive=%s", s);
+  }
+#else
+  if ((s = getenv("LD_LIBRARY_PATH")) != NULL)
+    addenv(blk, "LD_LIBRARY_PATH=%s", s);
+#endif // _WIN32
+
+  if ((s = getenv("PERLLIB")) != NULL)
+    addenv(blk, "PERLLIB=%s", s);
+
+  if (conn->request_info.remote_user != NULL) {
+    addenv(blk, "REMOTE_USER=%s", conn->request_info.remote_user);
+    addenv(blk, "%s", "AUTH_TYPE=Digest");
+  }
+
+  // Add all headers as HTTP_* variables
+  for (i = 0; i < conn->request_info.num_headers; i++) {
+    p = addenv(blk, "HTTP_%s=%s",
+        conn->request_info.http_headers[i].name,
+        conn->request_info.http_headers[i].value);
+
+    // Convert variable name into uppercase, and change - to _
+    for (; *p != '=' && *p != '\0'; p++) {
+      if (*p == '-')
+        *p = '_';
+      *p = (char) toupper(* (unsigned char *) p);
+    }
+  }
+
+  // Add user-specified variables
+  s = conn->ctx->config[CGI_ENVIRONMENT];
+  while ((s = next_option(s, &var_vec, NULL)) != NULL) {
+    addenv(blk, "%.*s", (int) var_vec.len, var_vec.ptr);
+  }
+
+  blk->vars[blk->nvars++] = NULL;
+  blk->buf[blk->len++] = '\0';
+
+  assert(blk->nvars < (int) ARRAY_SIZE(blk->vars));
+  assert(blk->len > 0);
+  assert(blk->len < (int) sizeof(blk->buf));
+}
+
+static void handle_cgi_request(struct mg_connection *conn, const char *prog) {
+  int headers_len, data_len, i, fd_stdin[2], fd_stdout[2];
+  const char *status, *status_text;
+  char buf[16384], *pbuf, dir[PATH_MAX], *p;
+  struct mg_request_info ri;
+  struct cgi_env_block blk;
+  FILE *in, *out;
+  struct file fout = STRUCT_FILE_INITIALIZER;
+  pid_t pid;
+
+  prepare_cgi_environment(conn, prog, &blk);
+
+  // CGI must be executed in its own directory. 'dir' must point to the
+  // directory containing executable program, 'p' must point to the
+  // executable program name relative to 'dir'.
+  (void) mg_snprintf(conn, dir, sizeof(dir), "%s", prog);
+  if ((p = strrchr(dir, '/')) != NULL) {
+    *p++ = '\0';
+  } else {
+    dir[0] = '.', dir[1] = '\0';
+    p = (char *) prog;
+  }
+
+  pid = (pid_t) -1;
+  fd_stdin[0] = fd_stdin[1] = fd_stdout[0] = fd_stdout[1] = -1;
+  in = out = NULL;
+
+  if (pipe(fd_stdin) != 0 || pipe(fd_stdout) != 0) {
+    send_http_error(conn, 500, http_500_error,
+        "Cannot create CGI pipe: %s", strerror(ERRNO));
+    goto done;
+  }
+
+  pid = spawn_process(conn, p, blk.buf, blk.vars, fd_stdin[0], fd_stdout[1],
+                      dir);
+  // spawn_process() must close those!
+  // If we don't mark them as closed, close() attempt before
+  // return from this function throws an exception on Windows.
+  // Windows does not like when closed descriptor is closed again.
+  fd_stdin[0] = fd_stdout[1] = -1;
+
+  if (pid == (pid_t) -1) {
+    send_http_error(conn, 500, http_500_error,
+        "Cannot spawn CGI process [%s]: %s", prog, strerror(ERRNO));
+    goto done;
+  }
+
+  if ((in = fdopen(fd_stdin[1], "wb")) == NULL ||
+      (out = fdopen(fd_stdout[0], "rb")) == NULL) {
+    send_http_error(conn, 500, http_500_error,
+        "fopen: %s", strerror(ERRNO));
+    goto done;
+  }
+
+  setbuf(in, NULL);
+  setbuf(out, NULL);
+  fout.fp = out;
+
+  // Send POST data to the CGI process if needed
+  if (!strcmp(conn->request_info.request_method, "POST") &&
+      !forward_body_data(conn, in, INVALID_SOCKET, NULL)) {
+    goto done;
+  }
+
+  // Close so child gets an EOF.
+  fclose(in);
+  in = NULL;
+  fd_stdin[1] = -1;
+
+  // Now read CGI reply into a buffer. We need to set correct
+  // status code, thus we need to see all HTTP headers first.
+  // Do not send anything back to client, until we buffer in all
+  // HTTP headers.
+  data_len = 0;
+  headers_len = read_request(out, conn, buf, sizeof(buf), &data_len);
+  if (headers_len <= 0) {
+    send_http_error(conn, 500, http_500_error,
+                    "CGI program sent malformed or too big (>%u bytes) "
+                    "HTTP headers: [%.*s]",
+                    (unsigned) sizeof(buf), data_len, buf);
+    goto done;
+  }
+  pbuf = buf;
+  buf[headers_len - 1] = '\0';
+  parse_http_headers(&pbuf, &ri);
+
+  // Make up and send the status line
+  status_text = "OK";
+  if ((status = get_header(&ri, "Status")) != NULL) {
+    conn->status_code = atoi(status);
+    status_text = status;
+    while (isdigit(* (unsigned char *) status_text) || *status_text == ' ') {
+      status_text++;
+    }
+  } else if (get_header(&ri, "Location") != NULL) {
+    conn->status_code = 302;
+  } else {
+    conn->status_code = 200;
+  }
+  if (get_header(&ri, "Connection") != NULL &&
+      !mg_strcasecmp(get_header(&ri, "Connection"), "keep-alive")) {
+    conn->must_close = 1;
+  }
+  (void) mg_printf(conn, "HTTP/1.1 %d %s\r\n", conn->status_code,
+                   status_text);
+
+  // Send headers
+  for (i = 0; i < ri.num_headers; i++) {
+    mg_printf(conn, "%s: %s\r\n",
+              ri.http_headers[i].name, ri.http_headers[i].value);
+  }
+  mg_write(conn, "\r\n", 2);
+
+  // Send chunk of data that may have been read after the headers
+  conn->num_bytes_sent += mg_write(conn, buf + headers_len,
+                                   (size_t)(data_len - headers_len));
+
+  // Read the rest of CGI output and send to the client
+  send_file_data(conn, &fout, 0, INT64_MAX);
+
+done:
+  if (pid != (pid_t) -1) {
+    kill(pid, SIGKILL);
+  }
+  if (fd_stdin[0] != -1) {
+    close(fd_stdin[0]);
+  }
+  if (fd_stdout[1] != -1) {
+    close(fd_stdout[1]);
+  }
+
+  if (in != NULL) {
+    fclose(in);
+  } else if (fd_stdin[1] != -1) {
+    close(fd_stdin[1]);
+  }
+
+  if (out != NULL) {
+    fclose(out);
+  } else if (fd_stdout[0] != -1) {
+    close(fd_stdout[0]);
+  }
+}
+#endif // !NO_CGI
+
+// For a given PUT path, create all intermediate subdirectories
+// for given path. Return 0 if the path itself is a directory,
+// or -1 on error, 1 if OK.
+static int put_dir(struct mg_connection *conn, const char *path) {
+  char buf[PATH_MAX];
+  const char *s, *p;
+  struct file file = STRUCT_FILE_INITIALIZER;
+  int len, res = 1;
+
+  for (s = p = path + 2; (p = strchr(s, '/')) != NULL; s = ++p) {
+    len = p - path;
+    if (len >= (int) sizeof(buf)) {
+      res = -1;
+      break;
+    }
+    memcpy(buf, path, len);
+    buf[len] = '\0';
+
+    // Try to create intermediate directory
+    DEBUG_TRACE(("mkdir(%s)", buf));
+    if (!mg_stat(conn, buf, &file) && mg_mkdir(buf, 0755) != 0) {
+      res = -1;
+      break;
+    }
+
+    // Is path itself a directory?
+    if (p[1] == '\0') {
+      res = 0;
+    }
+  }
+
+  return res;
+}
+
+static void put_file(struct mg_connection *conn, const char *path) {
+  struct file file = STRUCT_FILE_INITIALIZER;
+  const char *range;
+  int64_t r1, r2;
+  int rc;
+
+  conn->status_code = mg_stat(conn, path, &file) ? 200 : 201;
+
+  if ((rc = put_dir(conn, path)) == 0) {
+    mg_printf(conn, "HTTP/1.1 %d OK\r\n\r\n", conn->status_code);
+  } else if (rc == -1) {
+    send_http_error(conn, 500, http_500_error,
+                    "put_dir(%s): %s", path, strerror(ERRNO));
+  } else if (!mg_fopen(conn, path, "wb+", &file) || file.fp == NULL) {
+    mg_fclose(&file);
+    send_http_error(conn, 500, http_500_error,
+                    "fopen(%s): %s", path, strerror(ERRNO));
+  } else {
+    fclose_on_exec(&file);
+    range = mg_get_header(conn, "Content-Range");
+    r1 = r2 = 0;
+    if (range != NULL && parse_range_header(range, &r1, &r2) > 0) {
+      conn->status_code = 206;
+      fseeko(file.fp, r1, SEEK_SET);
+    }
+    if (forward_body_data(conn, file.fp, INVALID_SOCKET, NULL)) {
+      mg_printf(conn, "HTTP/1.1 %d OK\r\n\r\n", conn->status_code);
+    }
+    mg_fclose(&file);
+  }
+}
+
+static void send_ssi_file(struct mg_connection *, const char *,
+                          struct file *, int);
+
+static void do_ssi_include(struct mg_connection *conn, const char *ssi,
+                           char *tag, int include_level) {
+  char file_name[MG_BUF_LEN], path[PATH_MAX], *p;
+  struct file file = STRUCT_FILE_INITIALIZER;
+
+  // sscanf() is safe here, since send_ssi_file() also uses buffer
+  // of size MG_BUF_LEN to get the tag. So strlen(tag) is always < MG_BUF_LEN.
+  if (sscanf(tag, " virtual=\"%[^\"]\"", file_name) == 1) {
+    // File name is relative to the webserver root
+    (void) mg_snprintf(conn, path, sizeof(path), "%s%c%s",
+        conn->ctx->config[DOCUMENT_ROOT], '/', file_name);
+  } else if (sscanf(tag, " file=\"%[^\"]\"", file_name) == 1) {
+    // File name is relative to the webserver working directory
+    // or it is absolute system path
+    (void) mg_snprintf(conn, path, sizeof(path), "%s", file_name);
+  } else if (sscanf(tag, " \"%[^\"]\"", file_name) == 1) {
+    // File name is relative to the currect document
+    (void) mg_snprintf(conn, path, sizeof(path), "%s", ssi);
+    if ((p = strrchr(path, '/')) != NULL) {
+      p[1] = '\0';
+    }
+    (void) mg_snprintf(conn, path + strlen(path),
+        sizeof(path) - strlen(path), "%s", file_name);
+  } else {
+    cry(conn, "Bad SSI #include: [%s]", tag);
+    return;
+  }
+
+  if (!mg_fopen(conn, path, "rb", &file)) {
+    cry(conn, "Cannot open SSI #include: [%s]: fopen(%s): %s",
+        tag, path, strerror(ERRNO));
+  } else {
+    fclose_on_exec(&file);
+    if (match_prefix(conn->ctx->config[SSI_EXTENSIONS],
+                     strlen(conn->ctx->config[SSI_EXTENSIONS]), path) > 0) {
+      send_ssi_file(conn, path, &file, include_level + 1);
+    } else {
+      send_file_data(conn, &file, 0, INT64_MAX);
+    }
+    mg_fclose(&file);
+  }
+}
+
+#if !defined(NO_POPEN)
+static void do_ssi_exec(struct mg_connection *conn, char *tag) {
+  char cmd[MG_BUF_LEN];
+  struct file file = STRUCT_FILE_INITIALIZER;
+
+  if (sscanf(tag, " \"%[^\"]\"", cmd) != 1) {
+    cry(conn, "Bad SSI #exec: [%s]", tag);
+  } else if ((file.fp = popen(cmd, "r")) == NULL) {
+    cry(conn, "Cannot SSI #exec: [%s]: %s", cmd, strerror(ERRNO));
+  } else {
+    send_file_data(conn, &file, 0, INT64_MAX);
+    pclose(file.fp);
+  }
+}
+#endif // !NO_POPEN
+
+static int mg_fgetc(struct file *filep, int offset) {
+  if (filep->membuf != NULL && offset >=0 && offset < filep->size) {
+    return ((unsigned char *) filep->membuf)[offset];
+  } else if (filep->fp != NULL) {
+    return fgetc(filep->fp);
+  } else {
+    return EOF;
+  }
+}
+
+static void send_ssi_file(struct mg_connection *conn, const char *path,
+                          struct file *filep, int include_level) {
+  char buf[MG_BUF_LEN];
+  int ch, offset, len, in_ssi_tag;
+
+  if (include_level > 10) {
+    cry(conn, "SSI #include level is too deep (%s)", path);
+    return;
+  }
+
+  in_ssi_tag = len = offset = 0;
+  while ((ch = mg_fgetc(filep, offset)) != EOF) {
+    if (in_ssi_tag && ch == '>') {
+      in_ssi_tag = 0;
+      buf[len++] = (char) ch;
+      buf[len] = '\0';
+      assert(len <= (int) sizeof(buf));
+      if (len < 6 || memcmp(buf, "<!--#", 5) != 0) {
+        // Not an SSI tag, pass it
+        (void) mg_write(conn, buf, (size_t) len);
+      } else {
+        if (!memcmp(buf + 5, "include", 7)) {
+          do_ssi_include(conn, path, buf + 12, include_level);
+#if !defined(NO_POPEN)
+        } else if (!memcmp(buf + 5, "exec", 4)) {
+          do_ssi_exec(conn, buf + 9);
+#endif // !NO_POPEN
+        } else {
+          cry(conn, "%s: unknown SSI " "command: \"%s\"", path, buf);
+        }
+      }
+      len = 0;
+    } else if (in_ssi_tag) {
+      if (len == 5 && memcmp(buf, "<!--#", 5) != 0) {
+        // Not an SSI tag
+        in_ssi_tag = 0;
+      } else if (len == (int) sizeof(buf) - 2) {
+        cry(conn, "%s: SSI tag is too large", path);
+        len = 0;
+      }
+      buf[len++] = ch & 0xff;
+    } else if (ch == '<') {
+      in_ssi_tag = 1;
+      if (len > 0) {
+        mg_write(conn, buf, (size_t) len);
+      }
+      len = 0;
+      buf[len++] = ch & 0xff;
+    } else {
+      buf[len++] = ch & 0xff;
+      if (len == (int) sizeof(buf)) {
+        mg_write(conn, buf, (size_t) len);
+        len = 0;
+      }
+    }
+  }
+
+  // Send the rest of buffered data
+  if (len > 0) {
+    mg_write(conn, buf, (size_t) len);
+  }
+}
+
+static void handle_ssi_file_request(struct mg_connection *conn,
+                                    const char *path) {
+  struct file file = STRUCT_FILE_INITIALIZER;
+
+  if (!mg_fopen(conn, path, "rb", &file)) {
+    send_http_error(conn, 500, http_500_error, "fopen(%s): %s", path,
+                    strerror(ERRNO));
+  } else {
+    conn->must_close = 1;
+    fclose_on_exec(&file);
+    mg_printf(conn, "HTTP/1.1 200 OK\r\n"
+              "Content-Type: text/html\r\nConnection: %s\r\n\r\n",
+              suggest_connection_header(conn));
+    send_ssi_file(conn, path, &file, 0);
+    mg_fclose(&file);
+  }
+}
+
+static void send_options(struct mg_connection *conn) {
+  conn->status_code = 200;
+
+  mg_printf(conn, "%s", "HTTP/1.1 200 OK\r\n"
+            "Allow: GET, POST, HEAD, CONNECT, PUT, DELETE, OPTIONS\r\n"
+            "DAV: 1\r\n\r\n");
+}
+
+// Writes PROPFIND properties for a collection element
+static void print_props(struct mg_connection *conn, const char* uri,
+                        struct file *filep) {
+  char mtime[64];
+  gmt_time_string(mtime, sizeof(mtime), &filep->modification_time);
+  conn->num_bytes_sent += mg_printf(conn,
+      "<d:response>"
+       "<d:href>%s</d:href>"
+       "<d:propstat>"
+        "<d:prop>"
+         "<d:resourcetype>%s</d:resourcetype>"
+         "<d:getcontentlength>%" INT64_FMT "</d:getcontentlength>"
+         "<d:getlastmodified>%s</d:getlastmodified>"
+        "</d:prop>"
+        "<d:status>HTTP/1.1 200 OK</d:status>"
+       "</d:propstat>"
+      "</d:response>\n",
+      uri,
+      filep->is_directory ? "<d:collection/>" : "",
+      filep->size,
+      mtime);
+}
+
+static void print_dav_dir_entry(struct de *de, void *data) {
+  char href[PATH_MAX];
+  struct mg_connection *conn = (struct mg_connection *) data;
+  mg_snprintf(conn, href, sizeof(href), "%s%s",
+              conn->request_info.uri, de->file_name);
+  print_props(conn, href, &de->file);
+}
+
+static void handle_propfind(struct mg_connection *conn, const char *path,
+                            struct file *filep) {
+  const char *depth = mg_get_header(conn, "Depth");
+
+  conn->must_close = 1;
+  conn->status_code = 207;
+  mg_printf(conn, "HTTP/1.1 207 Multi-Status\r\n"
+            "Connection: close\r\n"
+            "Content-Type: text/xml; charset=utf-8\r\n\r\n");
+
+  conn->num_bytes_sent += mg_printf(conn,
+      "<?xml version=\"1.0\" encoding=\"utf-8\"?>"
+      "<d:multistatus xmlns:d='DAV:'>\n");
+
+  // Print properties for the requested resource itself
+  print_props(conn, conn->request_info.uri, filep);
+
+  // If it is a directory, print directory entries too if Depth is not 0
+  if (filep->is_directory &&
+      !mg_strcasecmp(conn->ctx->config[ENABLE_DIRECTORY_LISTING], "yes") &&
+      (depth == NULL || strcmp(depth, "0") != 0)) {
+    scan_directory(conn, path, conn, &print_dav_dir_entry);
+  }
+
+  conn->num_bytes_sent += mg_printf(conn, "%s\n", "</d:multistatus>");
+}
+
+#if defined(USE_WEBSOCKET)
+
+// START OF SHA-1 code
+// Copyright(c) By Steve Reid <steve@edmweb.com>
+#define SHA1HANDSOFF
+#if defined(__sun)
+#include "solarisfixes.h"
+#endif
+
+union char64long16 { unsigned char c[64]; uint32_t l[16]; };
+
+#define rol(value, bits) (((value) << (bits)) | ((value) >> (32 - (bits))))
+
+static uint32_t blk0(union char64long16 *block, int i) {
+  // Forrest: SHA expect BIG_ENDIAN, swap if LITTLE_ENDIAN
+  if (!is_big_endian()) {
+    block->l[i] = (rol(block->l[i], 24) & 0xFF00FF00) |
+      (rol(block->l[i], 8) & 0x00FF00FF);
+  }
+  return block->l[i];
+}
+
+#define blk(i) (block->l[i&15] = rol(block->l[(i+13)&15]^block->l[(i+8)&15] \
+    ^block->l[(i+2)&15]^block->l[i&15],1))
+#define R0(v,w,x,y,z,i) z+=((w&(x^y))^y)+blk0(block, i)+0x5A827999+rol(v,5);w=rol(w,30);
+#define R1(v,w,x,y,z,i) z+=((w&(x^y))^y)+blk(i)+0x5A827999+rol(v,5);w=rol(w,30);
+#define R2(v,w,x,y,z,i) z+=(w^x^y)+blk(i)+0x6ED9EBA1+rol(v,5);w=rol(w,30);
+#define R3(v,w,x,y,z,i) z+=(((w|x)&y)|(w&x))+blk(i)+0x8F1BBCDC+rol(v,5);w=rol(w,30);
+#define R4(v,w,x,y,z,i) z+=(w^x^y)+blk(i)+0xCA62C1D6+rol(v,5);w=rol(w,30);
+
+typedef struct {
+    uint32_t state[5];
+    uint32_t count[2];
+    unsigned char buffer[64];
+} SHA1_CTX;
+
+static void SHA1Transform(uint32_t state[5], const unsigned char buffer[64]) {
+  uint32_t a, b, c, d, e;
+  union char64long16 block[1];
+
+  memcpy(block, buffer, 64);
+  a = state[0];
+  b = state[1];
+  c = state[2];
+  d = state[3];
+  e = state[4];
+  R0(a,b,c,d,e, 0); R0(e,a,b,c,d, 1); R0(d,e,a,b,c, 2); R0(c,d,e,a,b, 3);
+  R0(b,c,d,e,a, 4); R0(a,b,c,d,e, 5); R0(e,a,b,c,d, 6); R0(d,e,a,b,c, 7);
+  R0(c,d,e,a,b, 8); R0(b,c,d,e,a, 9); R0(a,b,c,d,e,10); R0(e,a,b,c,d,11);
+  R0(d,e,a,b,c,12); R0(c,d,e,a,b,13); R0(b,c,d,e,a,14); R0(a,b,c,d,e,15);
+  R1(e,a,b,c,d,16); R1(d,e,a,b,c,17); R1(c,d,e,a,b,18); R1(b,c,d,e,a,19);
+  R2(a,b,c,d,e,20); R2(e,a,b,c,d,21); R2(d,e,a,b,c,22); R2(c,d,e,a,b,23);
+  R2(b,c,d,e,a,24); R2(a,b,c,d,e,25); R2(e,a,b,c,d,26); R2(d,e,a,b,c,27);
+  R2(c,d,e,a,b,28); R2(b,c,d,e,a,29); R2(a,b,c,d,e,30); R2(e,a,b,c,d,31);
+  R2(d,e,a,b,c,32); R2(c,d,e,a,b,33); R2(b,c,d,e,a,34); R2(a,b,c,d,e,35);
+  R2(e,a,b,c,d,36); R2(d,e,a,b,c,37); R2(c,d,e,a,b,38); R2(b,c,d,e,a,39);
+  R3(a,b,c,d,e,40); R3(e,a,b,c,d,41); R3(d,e,a,b,c,42); R3(c,d,e,a,b,43);
+  R3(b,c,d,e,a,44); R3(a,b,c,d,e,45); R3(e,a,b,c,d,46); R3(d,e,a,b,c,47);
+  R3(c,d,e,a,b,48); R3(b,c,d,e,a,49); R3(a,b,c,d,e,50); R3(e,a,b,c,d,51);
+  R3(d,e,a,b,c,52); R3(c,d,e,a,b,53); R3(b,c,d,e,a,54); R3(a,b,c,d,e,55);
+  R3(e,a,b,c,d,56); R3(d,e,a,b,c,57); R3(c,d,e,a,b,58); R3(b,c,d,e,a,59);
+  R4(a,b,c,d,e,60); R4(e,a,b,c,d,61); R4(d,e,a,b,c,62); R4(c,d,e,a,b,63);
+  R4(b,c,d,e,a,64); R4(a,b,c,d,e,65); R4(e,a,b,c,d,66); R4(d,e,a,b,c,67);
+  R4(c,d,e,a,b,68); R4(b,c,d,e,a,69); R4(a,b,c,d,e,70); R4(e,a,b,c,d,71);
+  R4(d,e,a,b,c,72); R4(c,d,e,a,b,73); R4(b,c,d,e,a,74); R4(a,b,c,d,e,75);
+  R4(e,a,b,c,d,76); R4(d,e,a,b,c,77); R4(c,d,e,a,b,78); R4(b,c,d,e,a,79);
+  state[0] += a;
+  state[1] += b;
+  state[2] += c;
+  state[3] += d;
+  state[4] += e;
+  a = b = c = d = e = 0;
+  memset(block, '\0', sizeof(block));
+}
+
+static void SHA1Init(SHA1_CTX* context) {
+  context->state[0] = 0x67452301;
+  context->state[1] = 0xEFCDAB89;
+  context->state[2] = 0x98BADCFE;
+  context->state[3] = 0x10325476;
+  context->state[4] = 0xC3D2E1F0;
+  context->count[0] = context->count[1] = 0;
+}
+
+static void SHA1Update(SHA1_CTX* context, const unsigned char* data,
+                       uint32_t len) {
+  uint32_t i, j;
+
+  j = context->count[0];
+  if ((context->count[0] += len << 3) < j)
+    context->count[1]++;
+  context->count[1] += (len>>29);
+  j = (j >> 3) & 63;
+  if ((j + len) > 63) {
+    memcpy(&context->buffer[j], data, (i = 64-j));
+    SHA1Transform(context->state, context->buffer);
+    for ( ; i + 63 < len; i += 64) {
+      SHA1Transform(context->state, &data[i]);
+    }
+    j = 0;
+  }
+  else i = 0;
+  memcpy(&context->buffer[j], &data[i], len - i);
+}
+
+static void SHA1Final(unsigned char digest[20], SHA1_CTX* context) {
+  unsigned i;
+  unsigned char finalcount[8], c;
+
+  for (i = 0; i < 8; i++) {
+    finalcount[i] = (unsigned char)((context->count[(i >= 4 ? 0 : 1)]
+                                     >> ((3-(i & 3)) * 8) ) & 255);
+  }
+  c = 0200;
+  SHA1Update(context, &c, 1);
+  while ((context->count[0] & 504) != 448) {
+    c = 0000;
+    SHA1Update(context, &c, 1);
+  }
+  SHA1Update(context, finalcount, 8);
+  for (i = 0; i < 20; i++) {
+    digest[i] = (unsigned char)
+      ((context->state[i>>2] >> ((3-(i & 3)) * 8) ) & 255);
+  }
+  memset(context, '\0', sizeof(*context));
+  memset(&finalcount, '\0', sizeof(finalcount));
+}
+// END OF SHA1 CODE
+
+static void base64_encode(const unsigned char *src, int src_len, char *dst) {
+  static const char *b64 =
+    "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
+  int i, j, a, b, c;
+
+  for (i = j = 0; i < src_len; i += 3) {
+    a = src[i];
+    b = i + 1 >= src_len ? 0 : src[i + 1];
+    c = i + 2 >= src_len ? 0 : src[i + 2];
+
+    dst[j++] = b64[a >> 2];
+    dst[j++] = b64[((a & 3) << 4) | (b >> 4)];
+    if (i + 1 < src_len) {
+      dst[j++] = b64[(b & 15) << 2 | (c >> 6)];
+    }
+    if (i + 2 < src_len) {
+      dst[j++] = b64[c & 63];
+    }
+  }
+  while (j % 4 != 0) {
+    dst[j++] = '=';
+  }
+  dst[j++] = '\0';
+}
+
+static void send_websocket_handshake(struct mg_connection *conn) {
+  static const char *magic = "258EAFA5-E914-47DA-95CA-C5AB0DC85B11";
+  char buf[100], sha[20], b64_sha[sizeof(sha) * 2];
+  SHA1_CTX sha_ctx;
+
+  mg_snprintf(conn, buf, sizeof(buf), "%s%s",
+              mg_get_header(conn, "Sec-WebSocket-Key"), magic);
+  SHA1Init(&sha_ctx);
+  SHA1Update(&sha_ctx, (unsigned char *) buf, strlen(buf));
+  SHA1Final((unsigned char *) sha, &sha_ctx);
+  base64_encode((unsigned char *) sha, sizeof(sha), b64_sha);
+  mg_printf(conn, "%s%s%s",
+            "HTTP/1.1 101 Switching Protocols\r\n"
+            "Upgrade: websocket\r\n"
+            "Connection: Upgrade\r\n"
+            "Sec-WebSocket-Accept: ", b64_sha, "\r\n\r\n");
+}
+
+static void read_websocket(struct mg_connection *conn) {
+  unsigned char *buf = (unsigned char *) conn->buf + conn->request_len;
+  int n, len, mask_len, body_len, discard_len;
+
+  for (;;) {
+    if ((body_len = conn->data_len - conn->request_len) >= 2) {
+      len = buf[1] & 127;
+      mask_len = buf[1] & 128 ? 4 : 0;
+      if (len < 126) {
+        conn->content_len = 2 + mask_len + len;
+      } else if (len == 126 && body_len >= 4) {
+        conn->content_len = 4 + mask_len + ((((int) buf[2]) << 8) + buf[3]);
+      } else if (body_len >= 10) {
+        conn->content_len = 10 + mask_len +
+          (((uint64_t) htonl(* (uint32_t *) &buf[2])) << 32) +
+          htonl(* (uint32_t *) &buf[6]);
+      }
+    }
+
+    if (conn->content_len > 0) {
+      if (conn->ctx->callbacks.websocket_data != NULL &&
+          conn->ctx->callbacks.websocket_data(conn) == 0) {
+        break;  // Callback signalled to exit
+      }
+      discard_len = conn->content_len > body_len ?
+          body_len : (int) conn->content_len;
+      memmove(buf, buf + discard_len, conn->data_len - discard_len);
+      conn->data_len -= discard_len;
+      conn->content_len = conn->consumed_content = 0;
+    } else {
+      n = pull(NULL, conn, conn->buf + conn->data_len,
+               conn->buf_size - conn->data_len);
+      if (n <= 0) {
+        break;
+      }
+      conn->data_len += n;
+    }
+  }
+}
+
+static void handle_websocket_request(struct mg_connection *conn) {
+  if (strcmp(mg_get_header(conn, "Sec-WebSocket-Version"), "13") != 0) {
+    send_http_error(conn, 426, "Upgrade Required", "%s", "Upgrade Required");
+  } else if (conn->ctx->callbacks.websocket_connect != NULL &&
+             conn->ctx->callbacks.websocket_connect(conn) != 0) {
+    // Callback has returned non-zero, do not proceed with handshake
+  } else {
+    send_websocket_handshake(conn);
+    if (conn->ctx->callbacks.websocket_ready != NULL) {
+      conn->ctx->callbacks.websocket_ready(conn);
+    }
+    read_websocket(conn);
+  }
+}
+
+static int is_websocket_request(const struct mg_connection *conn) {
+  const char *host, *upgrade, *connection, *version, *key;
+
+  host = mg_get_header(conn, "Host");
+  upgrade = mg_get_header(conn, "Upgrade");
+  connection = mg_get_header(conn, "Connection");
+  key = mg_get_header(conn, "Sec-WebSocket-Key");
+  version = mg_get_header(conn, "Sec-WebSocket-Version");
+
+  return host != NULL && upgrade != NULL && connection != NULL &&
+    key != NULL && version != NULL &&
+    strstr(upgrade, "websocket") != NULL &&
+    strstr(connection, "Upgrade") != NULL;
+}
+#endif // !USE_WEBSOCKET
+
+static int isbyte(int n) {
+  return n >= 0 && n <= 255;
+}
+
+static int parse_net(const char *spec, uint32_t *net, uint32_t *mask) {
+  int n, a, b, c, d, slash = 32, len = 0;
+
+  if ((sscanf(spec, "%d.%d.%d.%d/%d%n", &a, &b, &c, &d, &slash, &n) == 5 ||
+      sscanf(spec, "%d.%d.%d.%d%n", &a, &b, &c, &d, &n) == 4) &&
+      isbyte(a) && isbyte(b) && isbyte(c) && isbyte(d) &&
+      slash >= 0 && slash < 33) {
+    len = n;
+    *net = ((uint32_t)a << 24) | ((uint32_t)b << 16) | ((uint32_t)c << 8) | d;
+    *mask = slash ? 0xffffffffU << (32 - slash) : 0;
+  }
+
+  return len;
+}
+
+static int set_throttle(const char *spec, uint32_t remote_ip, const char *uri) {
+  int throttle = 0;
+  struct vec vec, val;
+  uint32_t net, mask;
+  char mult;
+  double v;
+
+  while ((spec = next_option(spec, &vec, &val)) != NULL) {
+    mult = ',';
+    if (sscanf(val.ptr, "%lf%c", &v, &mult) < 1 || v < 0 ||
+        (lowercase(&mult) != 'k' && lowercase(&mult) != 'm' && mult != ',')) {
+      continue;
+    }
+    v *= lowercase(&mult) == 'k' ? 1024 : lowercase(&mult) == 'm' ? 1048576 : 1;
+    if (vec.len == 1 && vec.ptr[0] == '*') {
+      throttle = (int) v;
+    } else if (parse_net(vec.ptr, &net, &mask) > 0) {
+      if ((remote_ip & mask) == net) {
+        throttle = (int) v;
+      }
+    } else if (match_prefix(vec.ptr, vec.len, uri) > 0) {
+      throttle = (int) v;
+    }
+  }
+
+  return throttle;
+}
+
+static uint32_t get_remote_ip(const struct mg_connection *conn) {
+  return ntohl(* (uint32_t *) &conn->client.rsa.sin.sin_addr);
+}
+
+#ifdef USE_LUA
+
+#ifdef _WIN32
+static void *mmap(void *addr, int64_t len, int prot, int flags, int fd,
+                  int offset) {
+  HANDLE fh = (HANDLE) _get_osfhandle(fd);
+  HANDLE mh = CreateFileMapping(fh, 0, PAGE_READONLY, 0, 0, 0);
+  void *p = MapViewOfFile(mh, FILE_MAP_READ, 0, 0, (size_t) len);
+  CloseHandle(fh);
+  CloseHandle(mh);
+  return p;
+}
+#define munmap(x, y)  UnmapViewOfFile(x)
+#define MAP_FAILED NULL
+#define MAP_PRIVATE 0
+#define PROT_READ 0
+#else
+#include <sys/mman.h>
+#endif
+
+static void lsp(struct mg_connection *conn, const char *p, int64_t len,
+                lua_State *L) {
+  int i, j, pos = 0;
+
+  for (i = 0; i < len; i++) {
+    if (p[i] == '<' && p[i + 1] == '?') {
+      for (j = i + 1; j < len ; j++) {
+        if (p[j] == '?' && p[j + 1] == '>') {
+          mg_write(conn, p + pos, i - pos);
+          if (luaL_loadbuffer(L, p + (i + 2), j - (i + 2), "") == LUA_OK) {
+            lua_pcall(L, 0, LUA_MULTRET, 0);
+          }
+          pos = j + 2;
+          i = pos - 1;
+          break;
+        }
+      }
+    }
+  }
+
+  if (i > pos) {
+    mg_write(conn, p + pos, i - pos);
+  }
+}
+
+static int lsp_mg_print(lua_State *L) {
+  int i, num_args;
+  const char *str;
+  size_t size;
+  struct mg_connection *conn = lua_touserdata(L, lua_upvalueindex(1));
+
+  num_args = lua_gettop(L);
+  for (i = 1; i <= num_args; i++) {
+    if (lua_isstring(L, i)) {
+      str = lua_tolstring(L, i, &size);
+      mg_write(conn, str, size);
+    }
+  }
+
+  return 0;
+}
+
+static int lsp_mg_read(lua_State *L) {
+  struct mg_connection *conn = lua_touserdata(L, lua_upvalueindex(1));
+  char buf[1024];
+  int len = mg_read(conn, buf, sizeof(buf));
+
+  lua_settop(L, 0);
+  lua_pushlstring(L, buf, len);
+
+  return 1;
+}
+
+static void reg_string(struct lua_State *L, const char *name, const char *val) {
+  lua_pushstring(L, name);
+  lua_pushstring(L, val);
+  lua_rawset(L, -3);
+}
+
+static void reg_int(struct lua_State *L, const char *name, int val) {
+  lua_pushstring(L, name);
+  lua_pushinteger(L, val);
+  lua_rawset(L, -3);
+}
+
+static void prepare_lua_environment(struct mg_connection *conn, lua_State *L) {
+  const struct mg_request_info *ri = mg_get_request_info(conn);
+  extern void luaL_openlibs(lua_State *);
+  int i;
+
+  luaL_openlibs(L);
+#ifdef USE_LUA_SQLITE3
+  { extern int luaopen_lsqlite3(lua_State *); luaopen_lsqlite3(L); }
+#endif
+
+  // Register "print" function which calls mg_write()
+  lua_pushlightuserdata(L, conn);
+  lua_pushcclosure(L, lsp_mg_print, 1);
+  lua_setglobal(L, "print");
+
+  // Register mg_read()
+  lua_pushlightuserdata(L, conn);
+  lua_pushcclosure(L, lsp_mg_read, 1);
+  lua_setglobal(L, "read");
+
+  // Export request_info
+  lua_newtable(L);
+  reg_string(L, "request_method", ri->request_method);
+  reg_string(L, "uri", ri->uri);
+  reg_string(L, "http_version", ri->http_version);
+  reg_string(L, "query_string", ri->query_string);
+  reg_int(L, "remote_ip", ri->remote_ip);
+  reg_int(L, "remote_port", ri->remote_port);
+  reg_int(L, "num_headers", ri->num_headers);
+  lua_pushstring(L, "http_headers");
+  lua_newtable(L);
+  for (i = 0; i < ri->num_headers; i++) {
+    reg_string(L, ri->http_headers[i].name, ri->http_headers[i].value);
+  }
+  lua_rawset(L, -3);
+  lua_setglobal(L, "request_info");
+}
+
+static void handle_lsp_request(struct mg_connection *conn, const char *path,
+                               struct file *filep) {
+  void *p = NULL;
+  lua_State *L = NULL;
+
+  if (!mg_stat(conn, path, filep) || !mg_fopen(conn, path, "r", filep)) {
+    send_http_error(conn, 404, "Not Found", "%s", "File not found");
+  } else if (filep->membuf == NULL &&
+             (p = mmap(NULL, (size_t) filep->size, PROT_READ, MAP_PRIVATE,
+                       fileno(filep->fp), 0)) == MAP_FAILED) {
+    send_http_error(conn, 500, http_500_error, "mmap(%s, %zu, %d): %s", path,
+                    (size_t) filep->size, fileno(filep->fp), strerror(errno));
+  } else if ((L = luaL_newstate()) == NULL) {
+    send_http_error(conn, 500, http_500_error, "%s", "luaL_newstate failed");
+  } else {
+    // We're not sending HTTP headers here, Lua page must do it.
+    prepare_lua_environment(conn, L);
+    if (conn->ctx->callbacks.init_lua != NULL) {
+      conn->ctx->callbacks.init_lua(conn, L);
+    }
+    lsp(conn, filep->membuf == NULL ? p : filep->membuf, filep->size, L);
+  }
+
+  if (L) lua_close(L);
+  if (p) munmap(p, filep->size);
+  mg_fclose(filep);
+}
+#endif // USE_LUA
+
+int mg_upload(struct mg_connection *conn, const char *destination_dir) {
+  const char *content_type_header, *boundary_start;
+  char buf[MG_BUF_LEN], path[PATH_MAX], fname[1024], boundary[100], *s;
+  FILE *fp;
+  int bl, n, i, j, headers_len, boundary_len, len = 0, num_uploaded_files = 0;
+
+  // Request looks like this:
+  //
+  // POST /upload HTTP/1.1
+  // Host: 127.0.0.1:8080
+  // Content-Length: 244894
+  // Content-Type: multipart/form-data; boundary=----WebKitFormBoundaryRVr
+  //
+  // ------WebKitFormBoundaryRVr
+  // Content-Disposition: form-data; name="file"; filename="accum.png"
+  // Content-Type: image/png
+  //
+  //  <89>PNG
+  //  <PNG DATA>
+  // ------WebKitFormBoundaryRVr
+
+  // Extract boundary string from the Content-Type header
+  if ((content_type_header = mg_get_header(conn, "Content-Type")) == NULL ||
+      (boundary_start = strstr(content_type_header, "boundary=")) == NULL ||
+      (sscanf(boundary_start, "boundary=\"%99[^\"]\"", boundary) == 0 &&
+       sscanf(boundary_start, "boundary=%99s", boundary) == 0) ||
+      boundary[0] == '\0') {
+    return num_uploaded_files;
+  }
+
+  boundary_len = strlen(boundary);
+  bl = boundary_len + 4;  // \r\n--<boundary>
+  for (;;) {
+    // Pull in headers
+    assert(len >= 0 && len <= (int) sizeof(buf));
+    while ((n = mg_read(conn, buf + len, sizeof(buf) - len)) > 0) {
+      len += n;
+    }
+    if ((headers_len = get_request_len(buf, len)) <= 0) {
+      break;
+    }
+
+    // Fetch file name.
+    fname[0] = '\0';
+    for (i = j = 0; i < headers_len; i++) {
+      if (buf[i] == '\r' && buf[i + 1] == '\n') {
+        buf[i] = buf[i + 1] = '\0';
+        // TODO(lsm): don't expect filename to be the 3rd field,
+        // parse the header properly instead.
+        sscanf(&buf[j], "Content-Disposition: %*s %*s filename=\"%1023[^\"]",
+               fname);
+        j = i + 2;
+      }
+    }
+
+    // Give up if the headers are not what we expect
+    if (fname[0] == '\0') {
+      break;
+    }
+
+    // Move data to the beginning of the buffer
+    assert(len >= headers_len);
+    memmove(buf, &buf[headers_len], len - headers_len);
+    len -= headers_len;
+
+    // We open the file with exclusive lock held. This guarantee us
+    // there is no other thread can save into the same file simultaneously.
+    fp = NULL;
+    // Construct destination file name. Do not allow paths to have slashes.
+    if ((s = strrchr(fname, '/')) == NULL) {
+      s = fname;
+    }
+    // Open file in binary mode. TODO: set an exclusive lock.
+    snprintf(path, sizeof(path), "%s/%s", destination_dir, s);
+    if ((fp = fopen(path, "wb")) == NULL) {
+      break;
+    }
+
+    // Read POST data, write into file until boundary is found.
+    n = 0;
+    do {
+      len += n;
+      for (i = 0; i < len - bl; i++) {
+        if (!memcmp(&buf[i], "\r\n--", 4) &&
+            !memcmp(&buf[i + 4], boundary, boundary_len)) {
+          // Found boundary, that's the end of file data.
+          fwrite(buf, 1, i, fp);
+          fflush(fp);
+          num_uploaded_files++;
+          if (conn->ctx->callbacks.upload != NULL) {
+            conn->ctx->callbacks.upload(conn, path);
+          }
+          memmove(buf, &buf[i + bl], len - (i + bl));
+          len -= i + bl;
+          break;
+        }
+      }
+      if (len > bl) {
+        fwrite(buf, 1, len - bl, fp);
+        memmove(buf, &buf[len - bl], bl);
+        len = bl;
+      }
+    } while ((n = mg_read(conn, buf + len, sizeof(buf) - len)) > 0);
+    fclose(fp);
+  }
+
+  return num_uploaded_files;
+}
+
+static int is_put_or_delete_request(const struct mg_connection *conn) {
+  const char *s = conn->request_info.request_method;
+  return s != NULL && (!strcmp(s, "PUT") || !strcmp(s, "DELETE"));
+}
+
+static int get_first_ssl_listener_index(const struct mg_context *ctx) {
+  int i, index = -1;
+  for (i = 0; index == -1 && i < ctx->num_listening_sockets; i++) {
+    index = ctx->listening_sockets[i].is_ssl ? i : -1;
+  }
+  return index;
+}
+
+static void redirect_to_https_port(struct mg_connection *conn, int ssl_index) {
+  char host[1025];
+  const char *host_header;
+
+  if ((host_header = mg_get_header(conn, "Host")) == NULL ||
+      sscanf(host_header, "%1024[^:]", host) == 0) {
+    // Cannot get host from the Host: header. Fallback to our IP address.
+    sockaddr_to_string(host, sizeof(host), &conn->client.lsa);
+  }
+
+  mg_printf(conn, "HTTP/1.1 302 Found\r\nLocation: https://%s:%d%s\r\n\r\n",
+            host, (int) ntohs(conn->ctx->listening_sockets[ssl_index].
+                              lsa.sin.sin_port), conn->request_info.uri);
+}
+
+// This is the heart of the Mongoose's logic.
+// This function is called when the request is read, parsed and validated,
+// and Mongoose must decide what action to take: serve a file, or
+// a directory, or call embedded function, etcetera.
+static void handle_request(struct mg_connection *conn) {
+  struct mg_request_info *ri = &conn->request_info;
+  char path[PATH_MAX];
+  int uri_len, ssl_index;
+  struct file file = STRUCT_FILE_INITIALIZER;
+
+  if ((conn->request_info.query_string = strchr(ri->uri, '?')) != NULL) {
+    * ((char *) conn->request_info.query_string++) = '\0';
+  }
+  uri_len = (int) strlen(ri->uri);
+  url_decode(ri->uri, uri_len, (char *) ri->uri, uri_len + 1, 0);
+  remove_double_dots_and_double_slashes((char *) ri->uri);
+  convert_uri_to_file_name(conn, path, sizeof(path), &file);
+  conn->throttle = set_throttle(conn->ctx->config[THROTTLE],
+                                get_remote_ip(conn), ri->uri);
+
+  DEBUG_TRACE(("%s", ri->uri));
+  // Perform redirect and auth checks before calling begin_request() handler.
+  // Otherwise, begin_request() would need to perform auth checks and redirects.
+  if (!conn->client.is_ssl && conn->client.ssl_redir &&
+      (ssl_index = get_first_ssl_listener_index(conn->ctx)) > -1) {
+    redirect_to_https_port(conn, ssl_index);
+  } else if (!is_put_or_delete_request(conn) &&
+             !check_authorization(conn, path)) {
+    send_authorization_request(conn);
+  } else if (conn->ctx->callbacks.begin_request != NULL &&
+      conn->ctx->callbacks.begin_request(conn)) {
+    // Do nothing, callback has served the request
+#if defined(USE_WEBSOCKET)
+  } else if (is_websocket_request(conn)) {
+    handle_websocket_request(conn);
+#endif
+  } else if (!strcmp(ri->request_method, "OPTIONS")) {
+    send_options(conn);
+  } else if (conn->ctx->config[DOCUMENT_ROOT] == NULL) {
+    send_http_error(conn, 404, "Not Found", "Not Found");
+  } else if (is_put_or_delete_request(conn) &&
+             (conn->ctx->config[PUT_DELETE_PASSWORDS_FILE] == NULL ||
+              is_authorized_for_put(conn) != 1)) {
+    send_authorization_request(conn);
+  } else if (!strcmp(ri->request_method, "PUT")) {
+    put_file(conn, path);
+  } else if (!strcmp(ri->request_method, "DELETE")) {
+    if (mg_remove(path) == 0) {
+      send_http_error(conn, 200, "OK", "%s", "");
+    } else {
+      send_http_error(conn, 500, http_500_error, "remove(%s): %s", path,
+                      strerror(ERRNO));
+    }
+  } else if ((file.membuf == NULL && file.modification_time == (time_t) 0) ||
+             must_hide_file(conn, path)) {
+    send_http_error(conn, 404, "Not Found", "%s", "File not found");
+  } else if (file.is_directory && ri->uri[uri_len - 1] != '/') {
+    mg_printf(conn, "HTTP/1.1 301 Moved Permanently\r\n"
+              "Location: %s/\r\n\r\n", ri->uri);
+  } else if (!strcmp(ri->request_method, "PROPFIND")) {
+    handle_propfind(conn, path, &file);
+  } else if (file.is_directory &&
+             !substitute_index_file(conn, path, sizeof(path), &file)) {
+    if (!mg_strcasecmp(conn->ctx->config[ENABLE_DIRECTORY_LISTING], "yes")) {
+      handle_directory_request(conn, path);
+    } else {
+      send_http_error(conn, 403, "Directory Listing Denied",
+          "Directory listing denied");
+    }
+#ifdef USE_LUA
+  } else if (match_prefix("**.lp$", 6, path) > 0) {
+    handle_lsp_request(conn, path, &file);
+#endif
+#if !defined(NO_CGI)
+  } else if (match_prefix(conn->ctx->config[CGI_EXTENSIONS],
+                          strlen(conn->ctx->config[CGI_EXTENSIONS]),
+                          path) > 0) {
+    if (strcmp(ri->request_method, "POST") &&
+        strcmp(ri->request_method, "HEAD") &&
+        strcmp(ri->request_method, "GET")) {
+      send_http_error(conn, 501, "Not Implemented",
+                      "Method %s is not implemented", ri->request_method);
+    } else {
+      handle_cgi_request(conn, path);
+    }
+#endif // !NO_CGI
+  } else if (match_prefix(conn->ctx->config[SSI_EXTENSIONS],
+                          strlen(conn->ctx->config[SSI_EXTENSIONS]),
+                          path) > 0) {
+    handle_ssi_file_request(conn, path);
+  } else if (is_not_modified(conn, &file)) {
+    send_http_error(conn, 304, "Not Modified", "%s", "");
+  } else {
+    handle_file_request(conn, path, &file);
+  }
+}
+
+static void close_all_listening_sockets(struct mg_context *ctx) {
+  int i;
+  for (i = 0; i < ctx->num_listening_sockets; i++) {
+    closesocket(ctx->listening_sockets[i].sock);
+  }
+  free(ctx->listening_sockets);
+}
+
+// Valid listening port specification is: [ip_address:]port[s]
+// Examples: 80, 443s, 127.0.0.1:3128, 1.2.3.4:8080s
+// TODO(lsm): add parsing of the IPv6 address
+static int parse_port_string(const struct vec *vec, struct socket *so) {
+  int a, b, c, d, port, len;
+
+  // MacOS needs that. If we do not zero it, subsequent bind() will fail.
+  // Also, all-zeroes in the socket address means binding to all addresses
+  // for both IPv4 and IPv6 (INADDR_ANY and IN6ADDR_ANY_INIT).
+  memset(so, 0, sizeof(*so));
+
+  if (sscanf(vec->ptr, "%d.%d.%d.%d:%d%n", &a, &b, &c, &d, &port, &len) == 5) {
+    // Bind to a specific IPv4 address
+    so->lsa.sin.sin_addr.s_addr = htonl((a << 24) | (b << 16) | (c << 8) | d);
+  } else if (sscanf(vec->ptr, "%d%n", &port, &len) != 1 ||
+             len <= 0 ||
+             len > (int) vec->len ||
+             (vec->ptr[len] && vec->ptr[len] != 's' &&
+              vec->ptr[len] != 'r' && vec->ptr[len] != ',')) {
+    return 0;
+  }
+
+  so->is_ssl = vec->ptr[len] == 's';
+  so->ssl_redir = vec->ptr[len] == 'r';
+#if defined(USE_IPV6)
+  so->lsa.sin6.sin6_family = AF_INET6;
+  so->lsa.sin6.sin6_port = htons((uint16_t) port);
+#else
+  so->lsa.sin.sin_family = AF_INET;
+  so->lsa.sin.sin_port = htons((uint16_t) port);
+#endif
+
+  return 1;
+}
+
+static int set_ports_option(struct mg_context *ctx) {
+  const char *list = ctx->config[LISTENING_PORTS];
+  int on = 1, success = 1;
+  struct vec vec;
+  struct socket so;
+
+  while (success && (list = next_option(list, &vec, NULL)) != NULL) {
+    if (!parse_port_string(&vec, &so)) {
+      cry(fc(ctx), "%s: %.*s: invalid port spec. Expecting list of: %s",
+          __func__, (int) vec.len, vec.ptr, "[IP_ADDRESS:]PORT[s|p]");
+      success = 0;
+    } else if (so.is_ssl && ctx->ssl_ctx == NULL) {
+      cry(fc(ctx), "Cannot add SSL socket, is -ssl_certificate option set?");
+      success = 0;
+    } else if ((so.sock = socket(so.lsa.sa.sa_family, SOCK_STREAM, 6)) ==
+               INVALID_SOCKET ||
+               // On Windows, SO_REUSEADDR is recommended only for
+               // broadcast UDP sockets
+               setsockopt(so.sock, SOL_SOCKET, SO_REUSEADDR,
+                          (void *) &on, sizeof(on)) != 0 ||
+               bind(so.sock, &so.lsa.sa, sizeof(so.lsa)) != 0 ||
+               listen(so.sock, SOMAXCONN) != 0) {
+      cry(fc(ctx), "%s: cannot bind to %.*s: %s", __func__,
+          (int) vec.len, vec.ptr, strerror(ERRNO));
+      closesocket(so.sock);
+      success = 0;
+    } else {
+      set_close_on_exec(so.sock);
+      // TODO: handle realloc failure
+      ctx->listening_sockets = realloc(ctx->listening_sockets,
+                                       (ctx->num_listening_sockets + 1) *
+                                       sizeof(ctx->listening_sockets[0]));
+      ctx->listening_sockets[ctx->num_listening_sockets] = so;
+      ctx->num_listening_sockets++;
+    }
+  }
+
+  if (!success) {
+    close_all_listening_sockets(ctx);
+  }
+
+  return success;
+}
+
+static void log_header(const struct mg_connection *conn, const char *header,
+                       FILE *fp) {
+  const char *header_value;
+
+  if ((header_value = mg_get_header(conn, header)) == NULL) {
+    (void) fprintf(fp, "%s", " -");
+  } else {
+    (void) fprintf(fp, " \"%s\"", header_value);
+  }
+}
+
+static void log_access(const struct mg_connection *conn) {
+  const struct mg_request_info *ri;
+  FILE *fp;
+  char date[64], src_addr[20];
+
+  fp = conn->ctx->config[ACCESS_LOG_FILE] == NULL ?  NULL :
+    fopen(conn->ctx->config[ACCESS_LOG_FILE], "a+");
+
+  if (fp == NULL)
+    return;
+
+  strftime(date, sizeof(date), "%d/%b/%Y:%H:%M:%S %z",
+           localtime(&conn->birth_time));
+
+  ri = &conn->request_info;
+  flockfile(fp);
+
+  sockaddr_to_string(src_addr, sizeof(src_addr), &conn->client.rsa);
+  fprintf(fp, "%s - %s [%s] \"%s %s HTTP/%s\" %d %" INT64_FMT,
+          src_addr, ri->remote_user == NULL ? "-" : ri->remote_user, date,
+          ri->request_method ? ri->request_method : "-",
+          ri->uri ? ri->uri : "-", ri->http_version,
+          conn->status_code, conn->num_bytes_sent);
+  log_header(conn, "Referer", fp);
+  log_header(conn, "User-Agent", fp);
+  fputc('\n', fp);
+  fflush(fp);
+
+  funlockfile(fp);
+  fclose(fp);
+}
+
+// Verify given socket address against the ACL.
+// Return -1 if ACL is malformed, 0 if address is disallowed, 1 if allowed.
+static int check_acl(struct mg_context *ctx, uint32_t remote_ip) {
+  int allowed, flag;
+  uint32_t net, mask;
+  struct vec vec;
+  const char *list = ctx->config[ACCESS_CONTROL_LIST];
+
+  // If any ACL is set, deny by default
+  allowed = list == NULL ? '+' : '-';
+
+  while ((list = next_option(list, &vec, NULL)) != NULL) {
+    flag = vec.ptr[0];
+    if ((flag != '+' && flag != '-') ||
+        parse_net(&vec.ptr[1], &net, &mask) == 0) {
+      cry(fc(ctx), "%s: subnet must be [+|-]x.x.x.x[/x]", __func__);
+      return -1;
+    }
+
+    if (net == (remote_ip & mask)) {
+      allowed = flag;
+    }
+  }
+
+  return allowed == '+';
+}
+
+#if !defined(_WIN32)
+static int set_uid_option(struct mg_context *ctx) {
+  struct passwd *pw;
+  const char *uid = ctx->config[RUN_AS_USER];
+  int success = 0;
+
+  if (uid == NULL) {
+    success = 1;
+  } else {
+    if ((pw = getpwnam(uid)) == NULL) {
+      cry(fc(ctx), "%s: unknown user [%s]", __func__, uid);
+    } else if (setgid(pw->pw_gid) == -1) {
+      cry(fc(ctx), "%s: setgid(%s): %s", __func__, uid, strerror(errno));
+    } else if (setuid(pw->pw_uid) == -1) {
+      cry(fc(ctx), "%s: setuid(%s): %s", __func__, uid, strerror(errno));
+    } else {
+      success = 1;
+    }
+  }
+
+  return success;
+}
+#endif // !_WIN32
+
+#if !defined(NO_SSL)
+static pthread_mutex_t *ssl_mutexes;
+
+static int sslize(struct mg_connection *conn, SSL_CTX *s, int (*func)(SSL *)) {
+  return (conn->ssl = SSL_new(s)) != NULL &&
+    SSL_set_fd(conn->ssl, conn->client.sock) == 1 &&
+    func(conn->ssl) == 1;
+}
+
+// Return OpenSSL error message
+static const char *ssl_error(void) {
+  unsigned long err;
+  err = ERR_get_error();
+  return err == 0 ? "" : ERR_error_string(err, NULL);
+}
+
+static void ssl_locking_callback(int mode, int mutex_num, const char *file,
+                                 int line) {
+  (void) line;
+  (void) file;
+
+  if (mode & 1) {  // 1 is CRYPTO_LOCK
+    (void) pthread_mutex_lock(&ssl_mutexes[mutex_num]);
+  } else {
+    (void) pthread_mutex_unlock(&ssl_mutexes[mutex_num]);
+  }
+}
+
+static unsigned long ssl_id_callback(void) {
+  return (unsigned long) pthread_self();
+}
+
+#if !defined(NO_SSL_DL)
+static int load_dll(struct mg_context *ctx, const char *dll_name,
+                    struct ssl_func *sw) {
+  union {void *p; void (*fp)(void);} u;
+  void  *dll_handle;
+  struct ssl_func *fp;
+
+  if ((dll_handle = dlopen(dll_name, RTLD_LAZY)) == NULL) {
+    cry(fc(ctx), "%s: cannot load %s", __func__, dll_name);
+    return 0;
+  }
+
+  for (fp = sw; fp->name != NULL; fp++) {
+#ifdef _WIN32
+    // GetProcAddress() returns pointer to function
+    u.fp = (void (*)(void)) dlsym(dll_handle, fp->name);
+#else
+    // dlsym() on UNIX returns void *. ISO C forbids casts of data pointers to
+    // function pointers. We need to use a union to make a cast.
+    u.p = dlsym(dll_handle, fp->name);
+#endif // _WIN32
+    if (u.fp == NULL) {
+      cry(fc(ctx), "%s: %s: cannot find %s", __func__, dll_name, fp->name);
+      return 0;
+    } else {
+      fp->ptr = u.fp;
+    }
+  }
+
+  return 1;
+}
+#endif // NO_SSL_DL
+
+// Dynamically load SSL library. Set up ctx->ssl_ctx pointer.
+static int set_ssl_option(struct mg_context *ctx) {
+  int i, size;
+  const char *pem;
+
+  // If PEM file is not specified, skip SSL initialization.
+  if ((pem = ctx->config[SSL_CERTIFICATE]) == NULL) {
+    return 1;
+  }
+
+#if !defined(NO_SSL_DL)
+  if (!load_dll(ctx, SSL_LIB, ssl_sw) ||
+      !load_dll(ctx, CRYPTO_LIB, crypto_sw)) {
+    return 0;
+  }
+#endif // NO_SSL_DL
+
+  // Initialize SSL library
+  SSL_library_init();
+  SSL_load_error_strings();
+
+  if ((ctx->ssl_ctx = SSL_CTX_new(SSLv23_server_method())) == NULL) {
+    cry(fc(ctx), "SSL_CTX_new (server) error: %s", ssl_error());
+    return 0;
+  }
+
+  // If user callback returned non-NULL, that means that user callback has
+  // set up certificate itself. In this case, skip sertificate setting.
+  if ((ctx->callbacks.init_ssl == NULL ||
+       !ctx->callbacks.init_ssl(ctx->ssl_ctx)) &&
+      (SSL_CTX_use_certificate_file(ctx->ssl_ctx, pem, 1) == 0 ||
+       SSL_CTX_use_PrivateKey_file(ctx->ssl_ctx, pem, 1) == 0)) {
+    cry(fc(ctx), "%s: cannot open %s: %s", __func__, pem, ssl_error());
+    return 0;
+  }
+
+  if (pem != NULL) {
+    (void) SSL_CTX_use_certificate_chain_file(ctx->ssl_ctx, pem);
+  }
+
+  // Initialize locking callbacks, needed for thread safety.
+  // http://www.openssl.org/support/faq.html#PROG1
+  size = sizeof(pthread_mutex_t) * CRYPTO_num_locks();
+  if ((ssl_mutexes = (pthread_mutex_t *) malloc((size_t)size)) == NULL) {
+    cry(fc(ctx), "%s: cannot allocate mutexes: %s", __func__, ssl_error());
+    return 0;
+  }
+
+  for (i = 0; i < CRYPTO_num_locks(); i++) {
+    pthread_mutex_init(&ssl_mutexes[i], NULL);
+  }
+
+  CRYPTO_set_locking_callback(&ssl_locking_callback);
+  CRYPTO_set_id_callback(&ssl_id_callback);
+
+  return 1;
+}
+
+static void uninitialize_ssl(struct mg_context *ctx) {
+  int i;
+  if (ctx->ssl_ctx != NULL) {
+    CRYPTO_set_locking_callback(NULL);
+    for (i = 0; i < CRYPTO_num_locks(); i++) {
+      pthread_mutex_destroy(&ssl_mutexes[i]);
+    }
+    CRYPTO_set_locking_callback(NULL);
+    CRYPTO_set_id_callback(NULL);
+  }
+}
+#endif // !NO_SSL
+
+static int set_gpass_option(struct mg_context *ctx) {
+  struct file file = STRUCT_FILE_INITIALIZER;
+  const char *path = ctx->config[GLOBAL_PASSWORDS_FILE];
+  if (path != NULL && !mg_stat(fc(ctx), path, &file)) {
+    cry(fc(ctx), "Cannot open %s: %s", path, strerror(ERRNO));
+    return 0;
+  }
+  return 1;
+}
+
+static int set_acl_option(struct mg_context *ctx) {
+  return check_acl(ctx, (uint32_t) 0x7f000001UL) != -1;
+}
+
+static void reset_per_request_attributes(struct mg_connection *conn) {
+  conn->path_info = NULL;
+  conn->num_bytes_sent = conn->consumed_content = 0;
+  conn->status_code = -1;
+  conn->must_close = conn->request_len = conn->throttle = 0;
+}
+
+static void close_socket_gracefully(struct mg_connection *conn) {
+#if defined(_WIN32)
+  char buf[MG_BUF_LEN];
+  int n;
+#endif
+  struct linger linger;
+
+  // Set linger option to avoid socket hanging out after close. This prevent
+  // ephemeral port exhaust problem under high QPS.
+  linger.l_onoff = 1;
+  linger.l_linger = 1;
+  setsockopt(conn->client.sock, SOL_SOCKET, SO_LINGER,
+             (char *) &linger, sizeof(linger));
+
+  // Send FIN to the client
+  shutdown(conn->client.sock, SHUT_WR);
+  set_non_blocking_mode(conn->client.sock);
+
+#if defined(_WIN32)
+  // Read and discard pending incoming data. If we do not do that and close the
+  // socket, the data in the send buffer may be discarded. This
+  // behaviour is seen on Windows, when client keeps sending data
+  // when server decides to close the connection; then when client
+  // does recv() it gets no data back.
+  do {
+    n = pull(NULL, conn, buf, sizeof(buf));
+  } while (n > 0);
+#endif
+
+  // Now we know that our FIN is ACK-ed, safe to close
+  closesocket(conn->client.sock);
+}
+
+static void close_connection(struct mg_connection *conn) {
+  conn->must_close = 1;
+  if (conn->client.sock != INVALID_SOCKET) {
+    close_socket_gracefully(conn);
+  }
+#ifndef NO_SSL
+  // Must be done AFTER socket is closed
+  if (conn->ssl != NULL) {
+    SSL_free(conn->ssl);
+  }
+#endif
+}
+
+void mg_close_connection(struct mg_connection *conn) {
+#ifndef NO_SSL
+  if (conn->client_ssl_ctx != NULL) {
+    SSL_CTX_free((SSL_CTX *) conn->client_ssl_ctx);
+  }
+#endif
+  close_connection(conn);
+  free(conn);
+}
+
+struct mg_connection *mg_connect(const char *host, int port, int use_ssl,
+                                 char *ebuf, size_t ebuf_len) {
+  static struct mg_context fake_ctx;
+  struct mg_connection *conn = NULL;
+  struct sockaddr_in sin;
+  struct hostent *he;
+  int sock;
+
+  if (host == NULL) {
+    snprintf(ebuf, ebuf_len, "%s", "NULL host");
+  } else if (use_ssl && SSLv23_client_method == NULL) {
+    snprintf(ebuf, ebuf_len, "%s", "SSL is not initialized");
+  } else if ((he = gethostbyname(host)) == NULL) {
+    snprintf(ebuf, ebuf_len, "gethostbyname(%s): %s", host, strerror(ERRNO));
+  } else if ((sock = socket(PF_INET, SOCK_STREAM, 0)) == INVALID_SOCKET) {
+    snprintf(ebuf, ebuf_len, "socket(): %s", strerror(ERRNO));
+  } else {
+    sin.sin_family = AF_INET;
+    sin.sin_port = htons((uint16_t) port);
+    sin.sin_addr = * (struct in_addr *) he->h_addr_list[0];
+    if (connect(sock, (struct sockaddr *) &sin, sizeof(sin)) != 0) {
+      snprintf(ebuf, ebuf_len, "connect(%s:%d): %s",
+               host, port, strerror(ERRNO));
+      closesocket(sock);
+    } else if ((conn = (struct mg_connection *)
+                calloc(1, sizeof(*conn) + MAX_REQUEST_SIZE)) == NULL) {
+      snprintf(ebuf, ebuf_len, "calloc(): %s", strerror(ERRNO));
+      closesocket(sock);
+#ifndef NO_SSL
+    } else if (use_ssl && (conn->client_ssl_ctx =
+                           SSL_CTX_new(SSLv23_client_method())) == NULL) {
+      snprintf(ebuf, ebuf_len, "SSL_CTX_new error");
+      closesocket(sock);
+      free(conn);
+      conn = NULL;
+#endif // NO_SSL
+    } else {
+      conn->buf_size = MAX_REQUEST_SIZE;
+      conn->buf = (char *) (conn + 1);
+      conn->ctx = &fake_ctx;
+      conn->client.sock = sock;
+      conn->client.rsa.sin = sin;
+      conn->client.is_ssl = use_ssl;
+#ifndef NO_SSL
+      if (use_ssl) {
+        // SSL_CTX_set_verify call is needed to switch off server certificate
+        // checking, which is off by default in OpenSSL and on in yaSSL.
+        SSL_CTX_set_verify(conn->client_ssl_ctx, 0, 0);
+        sslize(conn, conn->client_ssl_ctx, SSL_connect);
+      }
+#endif
+    }
+  }
+
+  return conn;
+}
+
+static int is_valid_uri(const char *uri) {
+  // Conform to http://www.w3.org/Protocols/rfc2616/rfc2616-sec5.html#sec5.1.2
+  // URI can be an asterisk (*) or should start with slash.
+  return uri[0] == '/' || (uri[0] == '*' && uri[1] == '\0');
+}
+
+static int getreq(struct mg_connection *conn, char *ebuf, size_t ebuf_len) {
+  const char *cl;
+
+  ebuf[0] = '\0';
+  reset_per_request_attributes(conn);
+  conn->request_len = read_request(NULL, conn, conn->buf, conn->buf_size,
+                                   &conn->data_len);
+  assert(conn->request_len < 0 || conn->data_len >= conn->request_len);
+
+  if (conn->request_len == 0 && conn->data_len == conn->buf_size) {
+    snprintf(ebuf, ebuf_len, "%s", "Request Too Large");
+  } if (conn->request_len <= 0) {
+    snprintf(ebuf, ebuf_len, "%s", "Client closed connection");
+  } else if (parse_http_message(conn->buf, conn->buf_size,
+                                &conn->request_info) <= 0) {
+    snprintf(ebuf, ebuf_len, "Bad request: [%.*s]", conn->data_len, conn->buf);
+  } else {
+    // Request is valid
+    if ((cl = get_header(&conn->request_info, "Content-Length")) != NULL) {
+      conn->content_len = strtoll(cl, NULL, 10);
+    } else if (!mg_strcasecmp(conn->request_info.request_method, "POST") ||
+               !mg_strcasecmp(conn->request_info.request_method, "PUT")) {
+      conn->content_len = -1;
+    } else {
+      conn->content_len = 0;
+    }
+    conn->birth_time = time(NULL);
+  }
+  return ebuf[0] == '\0';
+}
+
+struct mg_connection *mg_download(const char *host, int port, int use_ssl,
+                                  char *ebuf, size_t ebuf_len,
+                                  const char *fmt, ...) {
+  struct mg_connection *conn;
+  va_list ap;
+
+  va_start(ap, fmt);
+  ebuf[0] = '\0';
+  if ((conn = mg_connect(host, port, use_ssl, ebuf, ebuf_len)) == NULL) {
+  } else if (mg_vprintf(conn, fmt, ap) <= 0) {
+    snprintf(ebuf, ebuf_len, "%s", "Error sending request");
+  } else {
+    getreq(conn, ebuf, ebuf_len);
+  }
+  if (ebuf[0] != '\0' && conn != NULL) {
+    mg_close_connection(conn);
+    conn = NULL;
+  }
+
+  return conn;
+}
+
+static void process_new_connection(struct mg_connection *conn) {
+  struct mg_request_info *ri = &conn->request_info;
+  int keep_alive_enabled, keep_alive, discard_len;
+  char ebuf[100];
+
+  keep_alive_enabled = !strcmp(conn->ctx->config[ENABLE_KEEP_ALIVE], "yes");
+  keep_alive = 0;
+
+  // Important: on new connection, reset the receiving buffer. Credit goes
+  // to crule42.
+  conn->data_len = 0;
+  do {
+    if (!getreq(conn, ebuf, sizeof(ebuf))) {
+      send_http_error(conn, 500, "Server Error", "%s", ebuf);
+    } else if (!is_valid_uri(conn->request_info.uri)) {
+      snprintf(ebuf, sizeof(ebuf), "Invalid URI: [%s]", ri->uri);
+      send_http_error(conn, 400, "Bad Request", "%s", ebuf);
+    } else if (strcmp(ri->http_version, "1.0") &&
+               strcmp(ri->http_version, "1.1")) {
+      snprintf(ebuf, sizeof(ebuf), "Bad HTTP version: [%s]", ri->http_version);
+      send_http_error(conn, 505, "Bad HTTP version", "%s", ebuf);
+    }
+
+    if (ebuf[0] == '\0') {
+      handle_request(conn);
+      if (conn->ctx->callbacks.end_request != NULL) {
+        conn->ctx->callbacks.end_request(conn, conn->status_code);
+      }
+      log_access(conn);
+    }
+    if (ri->remote_user != NULL) {
+      free((void *) ri->remote_user);
+    }
+
+    // NOTE(lsm): order is important here. should_keep_alive() call
+    // is using parsed request, which will be invalid after memmove's below.
+    // Therefore, memorize should_keep_alive() result now for later use
+    // in loop exit condition.
+    keep_alive = conn->ctx->stop_flag == 0 && keep_alive_enabled &&
+      conn->content_len >= 0 && should_keep_alive(conn);
+
+    // Discard all buffered data for this request
+    discard_len = conn->content_len >= 0 && conn->request_len > 0 &&
+      conn->request_len + conn->content_len < (int64_t) conn->data_len ?
+      (int) (conn->request_len + conn->content_len) : conn->data_len;
+    assert(discard_len >= 0);
+    memmove(conn->buf, conn->buf + discard_len, conn->data_len - discard_len);
+    conn->data_len -= discard_len;
+    assert(conn->data_len >= 0);
+    assert(conn->data_len <= conn->buf_size);
+  } while (keep_alive);
+}
+
+// Worker threads take accepted socket from the queue
+static int consume_socket(struct mg_context *ctx, struct socket *sp) {
+  (void) pthread_mutex_lock(&ctx->mutex);
+  DEBUG_TRACE(("going idle"));
+
+  // If the queue is empty, wait. We're idle at this point.
+  while (ctx->sq_head == ctx->sq_tail && ctx->stop_flag == 0) {
+    pthread_cond_wait(&ctx->sq_full, &ctx->mutex);
+  }
+
+  // If we're stopping, sq_head may be equal to sq_tail.
+  if (ctx->sq_head > ctx->sq_tail) {
+    // Copy socket from the queue and increment tail
+    *sp = ctx->queue[ctx->sq_tail % ARRAY_SIZE(ctx->queue)];
+    ctx->sq_tail++;
+    DEBUG_TRACE(("grabbed socket %d, going busy", sp->sock));
+
+    // Wrap pointers if needed
+    while (ctx->sq_tail > (int) ARRAY_SIZE(ctx->queue)) {
+      ctx->sq_tail -= ARRAY_SIZE(ctx->queue);
+      ctx->sq_head -= ARRAY_SIZE(ctx->queue);
+    }
+  }
+
+  (void) pthread_cond_signal(&ctx->sq_empty);
+  (void) pthread_mutex_unlock(&ctx->mutex);
+
+  return !ctx->stop_flag;
+}
+
+static void *worker_thread(void *thread_func_param) {
+  struct mg_context *ctx = thread_func_param;
+  struct mg_connection *conn;
+
+  conn = (struct mg_connection *) calloc(1, sizeof(*conn) + MAX_REQUEST_SIZE);
+  if (conn == NULL) {
+    cry(fc(ctx), "%s", "Cannot create new connection struct, OOM");
+  } else {
+    conn->buf_size = MAX_REQUEST_SIZE;
+    conn->buf = (char *) (conn + 1);
+    conn->ctx = ctx;
+    conn->request_info.user_data = ctx->user_data;
+
+    // Call consume_socket() even when ctx->stop_flag > 0, to let it signal
+    // sq_empty condvar to wake up the master waiting in produce_socket()
+    while (consume_socket(ctx, &conn->client)) {
+      conn->birth_time = time(NULL);
+
+      // Fill in IP, port info early so even if SSL setup below fails,
+      // error handler would have the corresponding info.
+      // Thanks to Johannes Winkelmann for the patch.
+      // TODO(lsm): Fix IPv6 case
+      conn->request_info.remote_port = ntohs(conn->client.rsa.sin.sin_port);
+      memcpy(&conn->request_info.remote_ip,
+             &conn->client.rsa.sin.sin_addr.s_addr, 4);
+      conn->request_info.remote_ip = ntohl(conn->request_info.remote_ip);
+      conn->request_info.is_ssl = conn->client.is_ssl;
+
+      if (!conn->client.is_ssl
+#ifndef NO_SSL
+          || sslize(conn, conn->ctx->ssl_ctx, SSL_accept)
+#endif
+         ) {
+        process_new_connection(conn);
+      }
+
+      close_connection(conn);
+    }
+    free(conn);
+  }
+
+  // Signal master that we're done with connection and exiting
+  (void) pthread_mutex_lock(&ctx->mutex);
+  ctx->num_threads--;
+  (void) pthread_cond_signal(&ctx->cond);
+  assert(ctx->num_threads >= 0);
+  (void) pthread_mutex_unlock(&ctx->mutex);
+
+  DEBUG_TRACE(("exiting"));
+  return NULL;
+}
+
+// Master thread adds accepted socket to a queue
+static void produce_socket(struct mg_context *ctx, const struct socket *sp) {
+  (void) pthread_mutex_lock(&ctx->mutex);
+
+  // If the queue is full, wait
+  while (ctx->stop_flag == 0 &&
+         ctx->sq_head - ctx->sq_tail >= (int) ARRAY_SIZE(ctx->queue)) {
+    (void) pthread_cond_wait(&ctx->sq_empty, &ctx->mutex);
+  }
+
+  if (ctx->sq_head - ctx->sq_tail < (int) ARRAY_SIZE(ctx->queue)) {
+    // Copy socket to the queue and increment head
+    ctx->queue[ctx->sq_head % ARRAY_SIZE(ctx->queue)] = *sp;
+    ctx->sq_head++;
+    DEBUG_TRACE(("queued socket %d", sp->sock));
+  }
+
+  (void) pthread_cond_signal(&ctx->sq_full);
+  (void) pthread_mutex_unlock(&ctx->mutex);
+}
+
+static int set_sock_timeout(SOCKET sock, int milliseconds) {
+#ifdef _WIN32
+  DWORD t = milliseconds;
+#else
+  struct timeval t;
+  t.tv_sec = milliseconds / 1000;
+  t.tv_usec = (milliseconds * 1000) % 1000000;
+#endif
+  return setsockopt(sock, SOL_SOCKET, SO_RCVTIMEO, (void *) &t, sizeof(t)) ||
+    setsockopt(sock, SOL_SOCKET, SO_SNDTIMEO, (void *) &t, sizeof(t));
+}
+
+static void accept_new_connection(const struct socket *listener,
+                                  struct mg_context *ctx) {
+  struct socket so;
+  char src_addr[20];
+  socklen_t len = sizeof(so.rsa);
+  int on = 1;
+
+  if ((so.sock = accept(listener->sock, &so.rsa.sa, &len)) == INVALID_SOCKET) {
+  } else if (!check_acl(ctx, ntohl(* (uint32_t *) &so.rsa.sin.sin_addr))) {
+    sockaddr_to_string(src_addr, sizeof(src_addr), &so.rsa);
+    cry(fc(ctx), "%s: %s is not allowed to connect", __func__, src_addr);
+    closesocket(so.sock);
+  } else {
+    // Put so socket structure into the queue
+    DEBUG_TRACE(("Accepted socket %d", (int) so.sock));
+    so.is_ssl = listener->is_ssl;
+    so.ssl_redir = listener->ssl_redir;
+    getsockname(so.sock, &so.lsa.sa, &len);
+    // Set TCP keep-alive. This is needed because if HTTP-level keep-alive
+    // is enabled, and client resets the connection, server won't get
+    // TCP FIN or RST and will keep the connection open forever. With TCP
+    // keep-alive, next keep-alive handshake will figure out that the client
+    // is down and will close the server end.
+    // Thanks to Igor Klopov who suggested the patch.
+    setsockopt(so.sock, SOL_SOCKET, SO_KEEPALIVE, (void *) &on, sizeof(on));
+    set_sock_timeout(so.sock, atoi(ctx->config[REQUEST_TIMEOUT]));
+    produce_socket(ctx, &so);
+  }
+}
+
+static void *master_thread(void *thread_func_param) {
+  struct mg_context *ctx = thread_func_param;
+  struct pollfd *pfd;
+  int i;
+
+  // Increase priority of the master thread
+#if defined(_WIN32)
+  SetThreadPriority(GetCurrentThread(), THREAD_PRIORITY_ABOVE_NORMAL);
+#endif
+
+#if defined(ISSUE_317)
+  struct sched_param sched_param;
+  sched_param.sched_priority = sched_get_priority_max(SCHED_RR);
+  pthread_setschedparam(pthread_self(), SCHED_RR, &sched_param);
+#endif
+
+  pfd = calloc(ctx->num_listening_sockets, sizeof(pfd[0]));
+  while (ctx->stop_flag == 0) {
+    for (i = 0; i < ctx->num_listening_sockets; i++) {
+      pfd[i].fd = ctx->listening_sockets[i].sock;
+      pfd[i].events = POLLIN;
+    }
+
+    if (poll(pfd, ctx->num_listening_sockets, 200) > 0) {
+      for (i = 0; i < ctx->num_listening_sockets; i++) {
+        if (ctx->stop_flag == 0 && pfd[i].revents == POLLIN) {
+          accept_new_connection(&ctx->listening_sockets[i], ctx);
+        }
+      }
+    }
+  }
+  free(pfd);
+  DEBUG_TRACE(("stopping workers"));
+
+  // Stop signal received: somebody called mg_stop. Quit.
+  close_all_listening_sockets(ctx);
+
+  // Wakeup workers that are waiting for connections to handle.
+  pthread_cond_broadcast(&ctx->sq_full);
+
+  // Wait until all threads finish
+  (void) pthread_mutex_lock(&ctx->mutex);
+  while (ctx->num_threads > 0) {
+    (void) pthread_cond_wait(&ctx->cond, &ctx->mutex);
+  }
+  (void) pthread_mutex_unlock(&ctx->mutex);
+
+  // All threads exited, no sync is needed. Destroy mutex and condvars
+  (void) pthread_mutex_destroy(&ctx->mutex);
+  (void) pthread_cond_destroy(&ctx->cond);
+  (void) pthread_cond_destroy(&ctx->sq_empty);
+  (void) pthread_cond_destroy(&ctx->sq_full);
+
+#if !defined(NO_SSL)
+  uninitialize_ssl(ctx);
+#endif
+  DEBUG_TRACE(("exiting"));
+
+  // Signal mg_stop() that we're done.
+  // WARNING: This must be the very last thing this
+  // thread does, as ctx becomes invalid after this line.
+  ctx->stop_flag = 2;
+  return NULL;
+}
+
+static void free_context(struct mg_context *ctx) {
+  int i;
+
+  // Deallocate config parameters
+  for (i = 0; i < NUM_OPTIONS; i++) {
+    if (ctx->config[i] != NULL)
+      free(ctx->config[i]);
+  }
+
+#ifndef NO_SSL
+  // Deallocate SSL context
+  if (ctx->ssl_ctx != NULL) {
+    SSL_CTX_free(ctx->ssl_ctx);
+  }
+  if (ssl_mutexes != NULL) {
+    free(ssl_mutexes);
+    ssl_mutexes = NULL;
+  }
+#endif // !NO_SSL
+
+  // Deallocate context itself
+  free(ctx);
+}
+
+void mg_stop(struct mg_context *ctx) {
+  ctx->stop_flag = 1;
+
+  // Wait until mg_fini() stops
+  while (ctx->stop_flag != 2) {
+    (void) mg_sleep(10);
+  }
+  free_context(ctx);
+
+#if defined(_WIN32) && !defined(__SYMBIAN32__)
+  (void) WSACleanup();
+#endif // _WIN32
+}
+
+struct mg_context *mg_start(const struct mg_callbacks *callbacks,
+                            void *user_data,
+                            const char **options) {
+  struct mg_context *ctx;
+  const char *name, *value, *default_value;
+  int i;
+
+#if defined(_WIN32) && !defined(__SYMBIAN32__)
+  WSADATA data;
+  WSAStartup(MAKEWORD(2,2), &data);
+  InitializeCriticalSection(&global_log_file_lock);
+#endif // _WIN32
+
+  // Allocate context and initialize reasonable general case defaults.
+  // TODO(lsm): do proper error handling here.
+  if ((ctx = (struct mg_context *) calloc(1, sizeof(*ctx))) == NULL) {
+    return NULL;
+  }
+  ctx->callbacks = *callbacks;
+  ctx->user_data = user_data;
+
+  while (options && (name = *options++) != NULL) {
+    if ((i = get_option_index(name)) == -1) {
+      cry(fc(ctx), "Invalid option: %s", name);
+      free_context(ctx);
+      return NULL;
+    } else if ((value = *options++) == NULL) {
+      cry(fc(ctx), "%s: option value cannot be NULL", name);
+      free_context(ctx);
+      return NULL;
+    }
+    if (ctx->config[i] != NULL) {
+      cry(fc(ctx), "warning: %s: duplicate option", name);
+      free(ctx->config[i]);
+    }
+    ctx->config[i] = mg_strdup(value);
+    DEBUG_TRACE(("[%s] -> [%s]", name, value));
+  }
+
+  // Set default value if needed
+  for (i = 0; config_options[i * ENTRIES_PER_CONFIG_OPTION] != NULL; i++) {
+    default_value = config_options[i * ENTRIES_PER_CONFIG_OPTION + 2];
+    if (ctx->config[i] == NULL && default_value != NULL) {
+      ctx->config[i] = mg_strdup(default_value);
+      DEBUG_TRACE(("Setting default: [%s] -> [%s]",
+                   config_options[i * ENTRIES_PER_CONFIG_OPTION + 1],
+                   default_value));
+    }
+  }
+
+  // NOTE(lsm): order is important here. SSL certificates must
+  // be initialized before listening ports. UID must be set last.
+  if (!set_gpass_option(ctx) ||
+#if !defined(NO_SSL)
+      !set_ssl_option(ctx) ||
+#endif
+      !set_ports_option(ctx) ||
+#if !defined(_WIN32)
+      !set_uid_option(ctx) ||
+#endif
+      !set_acl_option(ctx)) {
+    free_context(ctx);
+    return NULL;
+  }
+
+#if !defined(_WIN32) && !defined(__SYMBIAN32__)
+  // Ignore SIGPIPE signal, so if browser cancels the request, it
+  // won't kill the whole process.
+  (void) signal(SIGPIPE, SIG_IGN);
+  // Also ignoring SIGCHLD to let the OS to reap zombies properly.
+  (void) signal(SIGCHLD, SIG_IGN);
+#endif // !_WIN32
+
+  (void) pthread_mutex_init(&ctx->mutex, NULL);
+  (void) pthread_cond_init(&ctx->cond, NULL);
+  (void) pthread_cond_init(&ctx->sq_empty, NULL);
+  (void) pthread_cond_init(&ctx->sq_full, NULL);
+
+  // Start master (listening) thread
+  mg_start_thread(master_thread, ctx);
+
+  // Start worker threads
+  for (i = 0; i < atoi(ctx->config[NUM_THREADS]); i++) {
+    if (mg_start_thread(worker_thread, ctx) != 0) {
+      cry(fc(ctx), "Cannot start worker thread: %d", ERRNO);
+    } else {
+      ctx->num_threads++;
+    }
+  }
+
+  return ctx;
+}

mongoose.h

@@ -1,292 +1,293 @@
-// Copyright (c) 2004-2012 Sergey Lyubka
-//
-// Permission is hereby granted, free of charge, to any person obtaining a copy
-// of this software and associated documentation files (the "Software"), to deal
-// in the Software without restriction, including without limitation the rights
-// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
-// copies of the Software, and to permit persons to whom the Software is
-// furnished to do so, subject to the following conditions:
-//
-// The above copyright notice and this permission notice shall be included in
-// all copies or substantial portions of the Software.
-//
-// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
-// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
-// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
-// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
-// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
-// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
-// THE SOFTWARE.
-
-#ifndef MONGOOSE_HEADER_INCLUDED
-#define  MONGOOSE_HEADER_INCLUDED
-
-#include <stdio.h>
-#include <stddef.h>
-
-#ifdef __cplusplus
-extern "C" {
-#endif // __cplusplus
-
-struct mg_context;     // Handle for the HTTP service itself
-struct mg_connection;  // Handle for the individual connection
-
-
-// This structure contains information about the HTTP request.
-struct mg_request_info {
-  const char *request_method; // "GET", "POST", etc
-  const char *uri;            // URL-decoded URI
-  const char *http_version;   // E.g. "1.0", "1.1"
-  const char *query_string;   // URL part after '?', not including '?', or NULL
-  const char *remote_user;    // Authenticated user, or NULL if no auth used
-  long remote_ip;             // Client's IP address
-  int remote_port;            // Client's port
-  int is_ssl;                 // 1 if SSL-ed, 0 if not
-  void *user_data;            // User data pointer passed to mg_start()
-
-  int num_headers;            // Number of HTTP headers
-  struct mg_header {
-    const char *name;         // HTTP header name
-    const char *value;        // HTTP header value
-  } http_headers[64];         // Maximum 64 headers
-};
-
-
-// This structure needs to be passed to mg_start(), to let mongoose know
-// which callbacks to invoke. For detailed description, see
-// https://github.com/valenok/mongoose/blob/master/UserManual.md
-struct mg_callbacks {
-  int  (*begin_request)(struct mg_connection *);
-  void (*end_request)(const struct mg_connection *, int reply_status_code);
-  int  (*log_message)(const struct mg_connection *, const char *message);
-  int  (*init_ssl)(void *ssl_context);
-  int (*websocket_connect)(const struct mg_connection *);
-  void (*websocket_ready)(struct mg_connection *);
-  int  (*websocket_data)(struct mg_connection *);
-  const char * (*open_file)(const struct mg_connection *,
-                             const char *path, size_t *data_len);
-  void (*init_lua)(struct mg_connection *, void *lua_context);
-  void (*upload)(struct mg_connection *, const char *file_name);
-};
-
-// Start web server.
-//
-// Parameters:
-//   callbacks: mg_callbacks structure with user-defined callbacks.
-//   options: NULL terminated list of option_name, option_value pairs that
-//            specify Mongoose configuration parameters.
-//
-// Side-effects: on UNIX, ignores SIGCHLD and SIGPIPE signals. If custom
-//    processing is required for these, signal handlers must be set up
-//    after calling mg_start().
-//
-//
-// Example:
-//   const char *options[] = {
-//     "document_root", "/var/www",
-//     "listening_ports", "80,443s",
-//     NULL
-//   };
-//   struct mg_context *ctx = mg_start(&my_func, NULL, options);
-//
-// Please refer to http://code.google.com/p/mongoose/wiki/MongooseManual
-// for the list of valid option and their possible values.
-//
-// Return:
-//   web server context, or NULL on error.
-struct mg_context *mg_start(const struct mg_callbacks *callbacks,
-                            void *user_data,
-                            const char **configuration_options);
-
-
-// Stop the web server.
-//
-// Must be called last, when an application wants to stop the web server and
-// release all associated resources. This function blocks until all Mongoose
-// threads are stopped. Context pointer becomes invalid.
-void mg_stop(struct mg_context *);
-
-
-// Get the value of particular configuration parameter.
-// The value returned is read-only. Mongoose does not allow changing
-// configuration at run time.
-// If given parameter name is not valid, NULL is returned. For valid
-// names, return value is guaranteed to be non-NULL. If parameter is not
-// set, zero-length string is returned.
-const char *mg_get_option(const struct mg_context *ctx, const char *name);
-
-
-// Return array of strings that represent valid configuration options.
-// For each option, a short name, long name, and default value is returned.
-// Array is NULL terminated.
-const char **mg_get_valid_option_names(void);
-
-
-// Add, edit or delete the entry in the passwords file.
-//
-// This function allows an application to manipulate .htpasswd files on the
-// fly by adding, deleting and changing user records. This is one of the
-// several ways of implementing authentication on the server side. For another,
-// cookie-based way please refer to the examples/chat.c in the source tree.
-//
-// If password is not NULL, entry is added (or modified if already exists).
-// If password is NULL, entry is deleted.
-//
-// Return:
-//   1 on success, 0 on error.
-int mg_modify_passwords_file(const char *passwords_file_name,
-                             const char *domain,
-                             const char *user,
-                             const char *password);
-
-
-// Return information associated with the request.
-struct mg_request_info *mg_get_request_info(struct mg_connection *);
-
-
-// Send data to the client.
-// Return:
-//  0   when the connection has been closed
-//  -1  on error
-//  number of bytes written on success
-int mg_write(struct mg_connection *, const void *buf, size_t len);
-
-
-#undef PRINTF_FORMAT_STRING
-#if _MSC_VER >= 1400
-#include <sal.h>
-#if _MSC_VER > 1400
-#define PRINTF_FORMAT_STRING(s) _Printf_format_string_ s
-#else
-#define PRINTF_FORMAT_STRING(s) __format_string s
-#endif
-#else
-#define PRINTF_FORMAT_STRING(s) s
-#endif
-
-#ifdef __GNUC__
-#define PRINTF_ARGS(x, y) __attribute__((format(printf, x, y)))
-#else
-#define PRINTF_ARGS(x, y)
-#endif
-
-// Send data to the browser using printf() semantics.
-//
-// Works exactly like mg_write(), but allows to do message formatting.
-// Below are the macros for enabling compiler-specific checks for
-// printf-like arguments.
-int mg_printf(struct mg_connection *,
-              PRINTF_FORMAT_STRING(const char *fmt), ...) PRINTF_ARGS(2, 3);
-
-
-// Send contents of the entire file together with HTTP headers.
-void mg_send_file(struct mg_connection *conn, const char *path);
-
-
-// Read data from the remote end, return number of bytes read.
-int mg_read(struct mg_connection *, void *buf, size_t len);
-
-
-// Get the value of particular HTTP header.
-//
-// This is a helper function. It traverses request_info->http_headers array,
-// and if the header is present in the array, returns its value. If it is
-// not present, NULL is returned.
-const char *mg_get_header(const struct mg_connection *, const char *name);
-
-
-// Get a value of particular form variable.
-//
-// Parameters:
-//   data: pointer to form-uri-encoded buffer. This could be either POST data,
-//         or request_info.query_string.
-//   data_len: length of the encoded data.
-//   var_name: variable name to decode from the buffer
-//   dst: destination buffer for the decoded variable
-//   dst_len: length of the destination buffer
-//
-// Return:
-//   On success, length of the decoded variable.
-//   On error:
-//      -1 (variable not found).
-//      -2 (destination buffer is NULL, zero length or too small to hold the decoded variable).
-//
-// Destination buffer is guaranteed to be '\0' - terminated if it is not
-// NULL or zero length.
-int mg_get_var(const char *data, size_t data_len,
-               const char *var_name, char *dst, size_t dst_len);
-
-// Fetch value of certain cookie variable into the destination buffer.
-//
-// Destination buffer is guaranteed to be '\0' - terminated. In case of
-// failure, dst[0] == '\0'. Note that RFC allows many occurrences of the same
-// parameter. This function returns only first occurrence.
-//
-// Return:
-//   On success, value length.
-//   On error:
-//      -1 (either "Cookie:" header is not present at all or the requested parameter is not found).
-//      -2 (destination buffer is NULL, zero length or too small to hold the value).
-int mg_get_cookie(const struct mg_connection *,
-                  const char *cookie_name, char *buf, size_t buf_len);
-
-
-// Download data from the remote web server.
-//   host: host name to connect to, e.g. "foo.com", or "10.12.40.1".
-//   port: port number, e.g. 80.
-//   use_ssl: wether to use SSL connection.
-//   error_buffer, error_buffer_size: error message placeholder.
-//   request_fmt,...: HTTP request.
-// Return:
-//   On success, valid pointer to the new connection, suitable for mg_read().
-//   On error, NULL. error_buffer contains error message.
-// Example:
-//   char ebuf[100];
-//   struct mg_connection *conn;
-//   conn = mg_download("google.com", 80, 0, ebuf, sizeof(ebuf),
-//                      "%s", "GET / HTTP/1.0\r\nHost: google.com\r\n\r\n");
-struct mg_connection *mg_download(const char *host, int port, int use_ssl,
-                                  char *error_buffer, size_t error_buffer_size,
-                                  PRINTF_FORMAT_STRING(const char *request_fmt),
-                                  ...) PRINTF_ARGS(6, 7);
-
-
-// Close the connection opened by mg_download().
-void mg_close_connection(struct mg_connection *conn);
-
-
-// File upload functionality. Each uploaded file gets saved into a temporary
-// file and MG_UPLOAD event is sent.
-// Return number of uploaded files.
-int mg_upload(struct mg_connection *conn, const char *destination_dir);
-
-
-// Convenience function -- create detached thread.
-// Return: 0 on success, non-0 on error.
-typedef void * (*mg_thread_func_t)(void *);
-int mg_start_thread(mg_thread_func_t f, void *p);
-
-
-// Return builtin mime type for the given file name.
-// For unrecognized extensions, "text/plain" is returned.
-const char *mg_get_builtin_mime_type(const char *file_name);
-
-
-// Return Mongoose version.
-const char *mg_version(void);
-
-
-// MD5 hash given strings.
-// Buffer 'buf' must be 33 bytes long. Varargs is a NULL terminated list of
-// ASCIIz strings. When function returns, buf will contain human-readable
-// MD5 hash. Example:
-//   char buf[33];
-//   mg_md5(buf, "aa", "bb", NULL);
-void mg_md5(char buf[33], ...);
-
-
-#ifdef __cplusplus
-}
-#endif // __cplusplus
-
-#endif // MONGOOSE_HEADER_INCLUDED
+// Copyright (c) 2004-2012 Sergey Lyubka
+//
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to deal
+// in the Software without restriction, including without limitation the rights
+// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+// copies of the Software, and to permit persons to whom the Software is
+// furnished to do so, subject to the following conditions:
+//
+// The above copyright notice and this permission notice shall be included in
+// all copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+// THE SOFTWARE.
+
+#ifndef MONGOOSE_HEADER_INCLUDED
+#define  MONGOOSE_HEADER_INCLUDED
+
+#include <stdio.h>
+#include <stddef.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif // __cplusplus
+
+struct mg_context;     // Handle for the HTTP service itself
+struct mg_connection;  // Handle for the individual connection
+
+
+// This structure contains information about the HTTP request.
+struct mg_request_info {
+  const char *request_method; // "GET", "POST", etc
+  const char *uri;            // URL-decoded URI
+  const char *http_version;   // E.g. "1.0", "1.1"
+  const char *query_string;   // URL part after '?', not including '?', or NULL
+  const char *remote_user;    // Authenticated user, or NULL if no auth used
+  long remote_ip;             // Client's IP address
+  int remote_port;            // Client's port
+  int is_ssl;                 // 1 if SSL-ed, 0 if not
+  void *user_data;            // User data pointer passed to mg_start()
+
+  int num_headers;            // Number of HTTP headers
+  struct mg_header {
+    const char *name;         // HTTP header name
+    const char *value;        // HTTP header value
+  } http_headers[64];         // Maximum 64 headers
+};
+
+
+// This structure needs to be passed to mg_start(), to let mongoose know
+// which callbacks to invoke. For detailed description, see
+// https://github.com/valenok/mongoose/blob/master/UserManual.md
+struct mg_callbacks {
+  int  (*begin_request)(struct mg_connection *);
+  void (*end_request)(const struct mg_connection *, int reply_status_code);
+  int  (*log_message)(const struct mg_connection *, const char *message);
+  int  (*init_ssl)(void *ssl_context);
+  int (*websocket_connect)(const struct mg_connection *);
+  void (*websocket_ready)(struct mg_connection *);
+  int  (*websocket_data)(struct mg_connection *);
+  const char * (*open_file)(const struct mg_connection *,
+                             const char *path, size_t *data_len);
+  void (*init_lua)(struct mg_connection *, void *lua_context);
+  void (*upload)(struct mg_connection *, const char *file_name);
+  int  (*http_error)(struct mg_connection *, int status);
+};
+
+// Start web server.
+//
+// Parameters:
+//   callbacks: mg_callbacks structure with user-defined callbacks.
+//   options: NULL terminated list of option_name, option_value pairs that
+//            specify Mongoose configuration parameters.
+//
+// Side-effects: on UNIX, ignores SIGCHLD and SIGPIPE signals. If custom
+//    processing is required for these, signal handlers must be set up
+//    after calling mg_start().
+//
+//
+// Example:
+//   const char *options[] = {
+//     "document_root", "/var/www",
+//     "listening_ports", "80,443s",
+//     NULL
+//   };
+//   struct mg_context *ctx = mg_start(&my_func, NULL, options);
+//
+// Please refer to http://code.google.com/p/mongoose/wiki/MongooseManual
+// for the list of valid option and their possible values.
+//
+// Return:
+//   web server context, or NULL on error.
+struct mg_context *mg_start(const struct mg_callbacks *callbacks,
+                            void *user_data,
+                            const char **configuration_options);
+
+
+// Stop the web server.
+//
+// Must be called last, when an application wants to stop the web server and
+// release all associated resources. This function blocks until all Mongoose
+// threads are stopped. Context pointer becomes invalid.
+void mg_stop(struct mg_context *);
+
+
+// Get the value of particular configuration parameter.
+// The value returned is read-only. Mongoose does not allow changing
+// configuration at run time.
+// If given parameter name is not valid, NULL is returned. For valid
+// names, return value is guaranteed to be non-NULL. If parameter is not
+// set, zero-length string is returned.
+const char *mg_get_option(const struct mg_context *ctx, const char *name);
+
+
+// Return array of strings that represent valid configuration options.
+// For each option, a short name, long name, and default value is returned.
+// Array is NULL terminated.
+const char **mg_get_valid_option_names(void);
+
+
+// Add, edit or delete the entry in the passwords file.
+//
+// This function allows an application to manipulate .htpasswd files on the
+// fly by adding, deleting and changing user records. This is one of the
+// several ways of implementing authentication on the server side. For another,
+// cookie-based way please refer to the examples/chat.c in the source tree.
+//
+// If password is not NULL, entry is added (or modified if already exists).
+// If password is NULL, entry is deleted.
+//
+// Return:
+//   1 on success, 0 on error.
+int mg_modify_passwords_file(const char *passwords_file_name,
+                             const char *domain,
+                             const char *user,
+                             const char *password);
+
+
+// Return information associated with the request.
+struct mg_request_info *mg_get_request_info(struct mg_connection *);
+
+
+// Send data to the client.
+// Return:
+//  0   when the connection has been closed
+//  -1  on error
+//  number of bytes written on success
+int mg_write(struct mg_connection *, const void *buf, size_t len);
+
+
+#undef PRINTF_FORMAT_STRING
+#if _MSC_VER >= 1400
+#include <sal.h>
+#if _MSC_VER > 1400
+#define PRINTF_FORMAT_STRING(s) _Printf_format_string_ s
+#else
+#define PRINTF_FORMAT_STRING(s) __format_string s
+#endif
+#else
+#define PRINTF_FORMAT_STRING(s) s
+#endif
+
+#ifdef __GNUC__
+#define PRINTF_ARGS(x, y) __attribute__((format(printf, x, y)))
+#else
+#define PRINTF_ARGS(x, y)
+#endif
+
+// Send data to the browser using printf() semantics.
+//
+// Works exactly like mg_write(), but allows to do message formatting.
+// Below are the macros for enabling compiler-specific checks for
+// printf-like arguments.
+int mg_printf(struct mg_connection *,
+              PRINTF_FORMAT_STRING(const char *fmt), ...) PRINTF_ARGS(2, 3);
+
+
+// Send contents of the entire file together with HTTP headers.
+void mg_send_file(struct mg_connection *conn, const char *path);
+
+
+// Read data from the remote end, return number of bytes read.
+int mg_read(struct mg_connection *, void *buf, size_t len);
+
+
+// Get the value of particular HTTP header.
+//
+// This is a helper function. It traverses request_info->http_headers array,
+// and if the header is present in the array, returns its value. If it is
+// not present, NULL is returned.
+const char *mg_get_header(const struct mg_connection *, const char *name);
+
+
+// Get a value of particular form variable.
+//
+// Parameters:
+//   data: pointer to form-uri-encoded buffer. This could be either POST data,
+//         or request_info.query_string.
+//   data_len: length of the encoded data.
+//   var_name: variable name to decode from the buffer
+//   dst: destination buffer for the decoded variable
+//   dst_len: length of the destination buffer
+//
+// Return:
+//   On success, length of the decoded variable.
+//   On error:
+//      -1 (variable not found).
+//      -2 (destination buffer is NULL, zero length or too small to hold the decoded variable).
+//
+// Destination buffer is guaranteed to be '\0' - terminated if it is not
+// NULL or zero length.
+int mg_get_var(const char *data, size_t data_len,
+               const char *var_name, char *dst, size_t dst_len);
+
+// Fetch value of certain cookie variable into the destination buffer.
+//
+// Destination buffer is guaranteed to be '\0' - terminated. In case of
+// failure, dst[0] == '\0'. Note that RFC allows many occurrences of the same
+// parameter. This function returns only first occurrence.
+//
+// Return:
+//   On success, value length.
+//   On error:
+//      -1 (either "Cookie:" header is not present at all or the requested parameter is not found).
+//      -2 (destination buffer is NULL, zero length or too small to hold the value).
+int mg_get_cookie(const struct mg_connection *,
+                  const char *cookie_name, char *buf, size_t buf_len);
+
+
+// Download data from the remote web server.
+//   host: host name to connect to, e.g. "foo.com", or "10.12.40.1".
+//   port: port number, e.g. 80.
+//   use_ssl: wether to use SSL connection.
+//   error_buffer, error_buffer_size: error message placeholder.
+//   request_fmt,...: HTTP request.
+// Return:
+//   On success, valid pointer to the new connection, suitable for mg_read().
+//   On error, NULL. error_buffer contains error message.
+// Example:
+//   char ebuf[100];
+//   struct mg_connection *conn;
+//   conn = mg_download("google.com", 80, 0, ebuf, sizeof(ebuf),
+//                      "%s", "GET / HTTP/1.0\r\nHost: google.com\r\n\r\n");
+struct mg_connection *mg_download(const char *host, int port, int use_ssl,
+                                  char *error_buffer, size_t error_buffer_size,
+                                  PRINTF_FORMAT_STRING(const char *request_fmt),
+                                  ...) PRINTF_ARGS(6, 7);
+
+
+// Close the connection opened by mg_download().
+void mg_close_connection(struct mg_connection *conn);
+
+
+// File upload functionality. Each uploaded file gets saved into a temporary
+// file and MG_UPLOAD event is sent.
+// Return number of uploaded files.
+int mg_upload(struct mg_connection *conn, const char *destination_dir);
+
+
+// Convenience function -- create detached thread.
+// Return: 0 on success, non-0 on error.
+typedef void * (*mg_thread_func_t)(void *);
+int mg_start_thread(mg_thread_func_t f, void *p);
+
+
+// Return builtin mime type for the given file name.
+// For unrecognized extensions, "text/plain" is returned.
+const char *mg_get_builtin_mime_type(const char *file_name);
+
+
+// Return Mongoose version.
+const char *mg_version(void);
+
+
+// MD5 hash given strings.
+// Buffer 'buf' must be 33 bytes long. Varargs is a NULL terminated list of
+// ASCIIz strings. When function returns, buf will contain human-readable
+// MD5 hash. Example:
+//   char buf[33];
+//   mg_md5(buf, "aa", "bb", NULL);
+void mg_md5(char buf[33], ...);
+
+
+#ifdef __cplusplus
+}
+#endif // __cplusplus
+
+#endif // MONGOOSE_HEADER_INCLUDED