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@@ -2176,14 +2176,21 @@ send_no_cache_header(struct mg_connection *conn)
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static int
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send_static_cache_header(struct mg_connection *conn)
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{
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+ /* Read the server config to check how long a file may be cached.
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+ * The configuration is in seconds. */
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int max_age = atoi(conn->ctx->config[STATIC_FILE_MAX_AGE]);
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if (max_age <= 0) {
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+ /* 0 means "do not cache". All values <0 are reserved
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+ * and may be used differently in the future. */
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+ /* If a file should not be cached, do not only send
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+ * max-age=0, but also pragmas and Expires headers. */
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return send_no_cache_header(conn);
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}
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/* Use "Cache-Control: max-age" instead of "Expires" header.
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* Reason: see https://www.mnot.net/blog/2007/05/15/expires_max-age */
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- return mg_printf(conn, "Cache-Control: max-age=%u\r\n", max_age);
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+ /* See also https://www.mnot.net/cache_docs/ */
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+ return mg_printf(conn, "Cache-Control: max-age=%u\r\n", (unsigned)max_age);
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}
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