curl / libcurl / API / curl_easy_setopt / CURLOPT_SSL_SESSIONID_CACHE

CURLOPT_SSL_SESSIONID_CACHE explained

Name

CURLOPT_SSL_SESSIONID_CACHE - use the SSL session-ID cache

Synopsis

#include <curl/curl.h>
 
CURLcode curl_easy_setopt(CURL *handle, CURLOPT_SSL_SESSIONID_CACHE,
                         long enabled);

Description

Pass a long set to 0 to disable libcurl's use of SSL session-ID caching. Set this to 1 to enable it. By default all transfers are done using the cache enabled. While nothing ever should get hurt by attempting to reuse SSL session-IDs, there seem to be or have been broken SSL implementations in the wild that may require you to disable this in order for you to succeed.

Default

Protocols

All TLS-based

Example

CURL *curl = curl_easy_init();
if(curl) {
  curl_easy_setopt(curl, CURLOPT_URL, "https://example.com/");
  /* switch off session-id use! */
  curl_easy_setopt(curl, CURLOPT_SSL_SESSIONID_CACHE, 0L);
  ret = curl_easy_perform(curl);
  curl_easy_cleanup(curl);
}

Availability

Added in 7.16.0

Return value

Returns CURLE_OK if the option is supported, and CURLE_UNKNOWN_OPTION if not.