mg_check_digest_access_authentication( conn, realm, filename );| Parameter | Type | Description | 
|---|---|---|
| conn | struct mg_connection * | A pointer to the connection to be used to send data | 
| realm | const char * | The requested authentication realm or NULL | 
| filename | const char * | The path to the passwords file | 
| Type | Description | 
|---|---|
| int | An integer indicating success or failure | 
This function can be used to check if a request header contains HTTP digest authentication
information, matching user and password encoded within the password file.
If the authentication realm (also called authentication domain) is NULL, the parameter
authentication_domain as specified in the server configuration (mg_start()) is used.
A positive return value means, the user name, realm and a correct password hash have been found in the passwords file. A return of 0 means, reading the password file succeeded, but there was no matching user, realm and password. The function returns a negative number on errors.