.\" generated by cd2nroff 0.1 from CURLOPT_SSL_SESSIONID_CACHE.md
.TH CURLOPT_SSL_SESSIONID_CACHE 3 "2024-11-18" libcurl
.SH NAME
CURLOPT_SSL_SESSIONID_CACHE \- use the SSL session\-ID cache
.SH SYNOPSIS
.nf
#include <curl/curl.h>

CURLcode curl_easy_setopt(CURL *handle, CURLOPT_SSL_SESSIONID_CACHE,
                         long enabled);
.fi
.SH DESCRIPTION
Pass a long set to 0 to disable libcurl\(aqs 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.
.SH DEFAULT
1
.SH PROTOCOLS
This functionality affects all TLS based protocols: HTTPS, FTPS, IMAPS, POP3S, SMTPS etc.

All TLS backends support this option.
.SH EXAMPLE
.nf
int main(void)
{
  CURL *curl = curl_easy_init();
  if(curl) {
    CURLcode res;
    curl_easy_setopt(curl, CURLOPT_URL, "https://example.com/");
    /* switch off session-id use! */
    curl_easy_setopt(curl, CURLOPT_SSL_SESSIONID_CACHE, 0L);
    res = curl_easy_perform(curl);
    curl_easy_cleanup(curl);
  }
}
.fi
.SH AVAILABILITY
Added in curl 7.16.0
.SH RETURN VALUE
Returns CURLE_OK if the option is supported, and CURLE_UNKNOWN_OPTION if not.
.SH SEE ALSO
.BR CURLOPT_DNS_CACHE_TIMEOUT (3),
.BR CURLOPT_MAXAGE_CONN (3),
.BR CURLOPT_MAXLIFETIME_CONN (3),
.BR CURLOPT_SSLVERSION (3)