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CURLOPT_SSL_SESSIONID_CACHE(3)                        Library Functions Manual


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

       1


PROTOCOLS

       This functionality affects all TLS based protocols: HTTPS, FTPS, IMAPS,
       POP3S, SMTPS etc.

       All TLS backends support this option.


EXAMPLE

       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);
         }
       }


AVAILABILITY

       Added in curl 7.16.0


RETURN VALUE

       curl_easy_setopt(3) returns a CURLcode indicating success or error.

       CURLE_OK (0) means everything was OK, non-zero means an error occurred,
       see libcurl-errors(3).


SEE ALSO

       CURLOPT_DNS_CACHE_TIMEOUT(3), CURLOPT_MAXAGE_CONN(3),
       CURLOPT_MAXLIFETIME_CONN(3), CURLOPT_SSLVERSION(3)

libcurl                           2025-02-08    CURLOPT_SSL_SESSIONID_CACHE(3)

curl 8.12.0 - Generated Wed Feb 19 08:58:55 CST 2025
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