90 lines
1.9 KiB
Markdown
90 lines
1.9 KiB
Markdown
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---
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c: Copyright (C) Daniel Stenberg, <daniel@haxx.se>, et al.
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SPDX-License-Identifier: curl
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Title: CURLOPT_CA_CACHE_TIMEOUT
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Section: 3
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Source: libcurl
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See-also:
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- CURLOPT_CAINFO (3)
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- CURLOPT_CAINFO_BLOB (3)
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- CURLOPT_CAPATH (3)
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- CURLOPT_SSL_VERIFYHOST (3)
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- CURLOPT_SSL_VERIFYPEER (3)
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Protocol:
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- TLS
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TLS-backend:
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- GnuTLS
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- OpenSSL
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- Schannel
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- wolfSSL
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Added-in: 7.87.0
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---
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# NAME
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CURLOPT_CA_CACHE_TIMEOUT - life-time for cached certificate stores
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# SYNOPSIS
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~~~c
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#include <curl/curl.h>
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CURLcode curl_easy_setopt(CURL *handle, CURLOPT_CA_CACHE_TIMEOUT, long age);
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~~~
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# DESCRIPTION
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Pass a long, this sets the timeout in seconds. This tells libcurl the maximum
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time any cached CA certificate store it has in memory may be kept and reused
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for new connections. Once the timeout has expired, a subsequent fetch
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requiring a CA certificate has to reload it.
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Building a CA certificate store from a CURLOPT_CAINFO(3) file is a slow
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operation so curl may cache the generated certificate store internally to
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speed up future connections.
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Set the timeout to zero to completely disable caching, or set to -1 to retain
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the cached store remain forever. By default, libcurl caches this info for 24
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hours.
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# DEFAULT
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86400 (24 hours)
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# %PROTOCOLS%
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# EXAMPLE
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~~~c
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int main(void)
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{
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CURL *curl = curl_easy_init();
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if(curl) {
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CURLcode res;
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curl_easy_setopt(curl, CURLOPT_URL, "https://example.com/foo.bin");
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/* only reuse certificate stores for a short time */
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curl_easy_setopt(curl, CURLOPT_CA_CACHE_TIMEOUT, 60L);
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res = curl_easy_perform(curl);
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/* in this second request, the cache is not used if more than
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sixty seconds passed since the previous connection */
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res = curl_easy_perform(curl);
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curl_easy_cleanup(curl);
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}
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}
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~~~
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# HISTORY
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This option is supported by OpenSSL and its forks (since 7.87.0), Schannel
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(since 8.5.0), wolfSSL (since 8.9.0) and GnuTLS (since 8.9.0).
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# %AVAILABILITY%
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# RETURN VALUE
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Returns CURLE_OK
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