84 lines
2.9 KiB
Groff
84 lines
2.9 KiB
Groff
.\" **************************************************************************
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.\" * _ _ ____ _
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.\" * Project ___| | | | _ \| |
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.\" * / __| | | | |_) | |
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.\" * | (__| |_| | _ <| |___
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.\" * \___|\___/|_| \_\_____|
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.\" *
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.\" * Copyright (C) Daniel Stenberg, <daniel@haxx.se>, et al.
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.\" *
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.\" * This software is licensed as described in the file COPYING, which
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.\" * you should have received as part of this distribution. The terms
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.\" * are also available at https://curl.se/docs/copyright.html.
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.\" *
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.\" * You may opt to use, copy, modify, merge, publish, distribute and/or sell
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.\" * copies of the Software, and permit persons to whom the Software is
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.\" * furnished to do so, under the terms of the COPYING file.
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.\" *
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.\" * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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.\" * KIND, either express or implied.
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.\" *
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.\" * SPDX-License-Identifier: curl
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.\" *
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.\" **************************************************************************
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.\"
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.TH CURLOPT_HSTS 3 "5 Feb 2019" libcurl libcurl
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.SH NAME
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CURLOPT_HSTS \- HSTS cache file name
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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_HSTS, char *filename);
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.fi
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.SH DESCRIPTION
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Make the \fIfilename\fP point to a file name to load an existing HSTS cache
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from, and to store the cache in when the easy handle is closed. Setting a file
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name with this option also enables HSTS for this handle (the equivalent of
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setting \fICURLHSTS_ENABLE\fP with \fICURLOPT_HSTS_CTRL(3)\fP).
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If the given file does not exist or contains no HSTS entries at startup, the
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HSTS cache simply starts empty. Setting the file name to NULL or "" only
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enables HSTS without reading from or writing to any file.
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If this option is set multiple times, libcurl loads cache entries from each
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given file but only stores the last used name for later writing.
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.SH "FILE FORMAT"
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The HSTS cache is saved to and loaded from a text file with one entry per
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physical line. Each line in the file has the following format:
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[host] [stamp]
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[host] is the domain name for the entry and the name is dot-prefixed if it is
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an entry valid for all subdomains to the name as well or only for the exact
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name.
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[stamp] is the time (in UTC) when the entry expires and it uses the format
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\&"YYYYMMDD HH:MM:SS".
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Lines starting with "#" are treated as comments and are ignored. There is
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currently no length or size limit.
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.SH DEFAULT
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NULL, no file name
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.SH PROTOCOLS
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HTTPS and HTTP
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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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curl_easy_setopt(curl, CURLOPT_HSTS, "/home/user/.hsts-cache");
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curl_easy_perform(curl);
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}
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}
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.fi
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.SH AVAILABILITY
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Added in 7.74.0
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.SH RETURN VALUE
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Returns CURLE_OK if the option is supported, and CURLE_UNKNOWN_OPTION if not.
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.SH "SEE ALSO"
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.BR CURLOPT_ALTSVC (3),
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.BR CURLOPT_HSTS_CTRL (3),
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.BR CURLOPT_RESOLVE (3)
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