NAME

       CURLOPT_CA_CACHE_TIMEOUT - life-time for cached certificate stores

SYNOPSIS

       #include <curl/curl.h>

       CURLcode curl_easy_setopt(CURL *handle, CURLOPT_CA_CACHE_TIMEOUT, long age);

DESCRIPTION

       Pass  a  long,  this  sets the timeout in seconds. This tells libcurl the maximum time any
       cached CA certificate store it has in memory may be kept and reused for  new  connections.
       Once  the timeout has expired, a subsequent fetch requiring a CA certificate has to reload
       it.

       Building a CA certificate store from a CURLOPT_CAINFO(3) file is a slow operation so  curl
       may cache the generated certificate store internally to speed up future connections.

       Set  the  timeout to zero to completely disable caching, or set to -1 to retain the cached
       store remain forever. By default, libcurl caches this info for 24 hours.

DEFAULT

       86400 (24 hours)

PROTOCOLS

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

       This option works only with the following TLS  backends:  GnuTLS,  OpenSSL,  Schannel  and
       wolfSSL

EXAMPLE

       int main(void)
       {
         CURL *curl = curl_easy_init();
         if(curl) {
           CURLcode res;
           curl_easy_setopt(curl, CURLOPT_URL, "https://example.com/foo.bin");

           /* only reuse certificate stores for a short time */
           curl_easy_setopt(curl, CURLOPT_CA_CACHE_TIMEOUT, 60L);

           res = curl_easy_perform(curl);

           /* in this second request, the cache is not used if more than
              sixty seconds passed since the previous connection */
           res = curl_easy_perform(curl);

           curl_easy_cleanup(curl);
         }
       }

HISTORY

       This  option is supported by OpenSSL and its forks (since 7.87.0), Schannel (since 8.5.0),
       wolfSSL (since 8.9.0) and GnuTLS (since 8.9.0).

AVAILABILITY

       Added in curl 7.87.0

RETURN VALUE

       Returns CURLE_OK

SEE ALSO

       CURLOPT_CAINFO(3), CURLOPT_CAINFO_BLOB(3),  CURLOPT_CAPATH(3),  CURLOPT_SSL_VERIFYHOST(3),
       CURLOPT_SSL_VERIFYPEER(3)