66 lines
2.0 KiB
Groff
66 lines
2.0 KiB
Groff
.\" generated by cd2nroff 0.1 from CURLOPT_CA_CACHE_TIMEOUT.md
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.TH CURLOPT_CA_CACHE_TIMEOUT 3 "2024-09-25" libcurl
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.SH NAME
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CURLOPT_CA_CACHE_TIMEOUT \- life\-time for cached certificate stores
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.SH SYNOPSIS
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.nf
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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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.fi
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.SH 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 \fICURLOPT_CAINFO(3)\fP 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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.SH DEFAULT
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86400 (24 hours)
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.SH PROTOCOLS
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This functionality affects all TLS based protocols: HTTPS, FTPS, IMAPS, POP3S, SMTPS etc.
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This option works only with the following TLS backends:
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GnuTLS, OpenSSL, Schannel and wolfSSL
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.SH EXAMPLE
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.nf
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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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.fi
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.SH 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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.SH AVAILABILITY
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Added in curl 7.87.0
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.SH RETURN VALUE
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Returns CURLE_OK
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.SH SEE ALSO
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.BR CURLOPT_CAINFO (3),
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.BR CURLOPT_CAINFO_BLOB (3),
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.BR CURLOPT_CAPATH (3),
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.BR CURLOPT_SSL_VERIFYHOST (3),
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.BR CURLOPT_SSL_VERIFYPEER (3)
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