.\" **************************************************************************
.\" *                                  _   _ ____  _
.\" *  Project                     ___| | | |  _ \| |
.\" *                             / __| | | | |_) | |
.\" *                            | (__| |_| |  _ <| |___
.\" *                             \___|\___/|_| \_\_____|
.\" *
.\" * Copyright (C) Daniel Stenberg, <daniel@haxx.se>, et al.
.\" *
.\" * This software is licensed as described in the file COPYING, which
.\" * you should have received as part of this distribution. The terms
.\" * are also available at https://curl.se/docs/copyright.html.
.\" *
.\" * You may opt to use, copy, modify, merge, publish, distribute and/or sell
.\" * copies of the Software, and permit persons to whom the Software is
.\" * furnished to do so, under the terms of the COPYING file.
.\" *
.\" * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
.\" * KIND, either express or implied.
.\" *
.\" * SPDX-License-Identifier: curl
.\" *
.\" **************************************************************************
.\"
.TH CURLOPT_SSL_SESSIONID_CACHE 3 "September 26, 2023" "ibcurl 8.4.0" 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);
.SH 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.
.SH DEFAULT
1
.SH PROTOCOLS
All TLS-based
.SH EXAMPLE
.nf
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);
}
.fi
.SH AVAILABILITY
Added in 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)