2020-11-03 06:17:01 +08:00
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.\" **************************************************************************
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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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2021-09-07 05:04:13 +08:00
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.\" * Copyright (C) 2020, 2021, Daniel Stenberg, <daniel@haxx.se>, et al.
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2020-11-03 06:17:01 +08:00
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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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2020-11-04 21:02:01 +08:00
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.\" * are also available at https://curl.se/docs/copyright.html.
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2020-11-03 06:17:01 +08:00
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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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.\" **************************************************************************
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.\"
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.TH CURLOPT_HSTS_CTRL 3 "4 Sep 2020" "libcurl 7.74.0" "curl_easy_setopt options"
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.SH NAME
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CURLOPT_HSTS_CTRL \- control HSTS behavior
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.SH SYNOPSIS
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.nf
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#include <curl/curl.h>
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#define CURLHSTS_ENABLE (1<<0)
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#define CURLHSTS_READONLYFILE (1<<1)
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CURLcode curl_easy_setopt(CURL *handle, CURLOPT_HSTS_CTRL, long bitmask);
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.fi
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.SH DESCRIPTION
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HSTS (HTTP Strict Transport Security) means that an HTTPS server can instruct
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the client to not contact it again over clear-text HTTP for a certain period
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into the future. libcurl will then automatically redirect HTTP attempts to
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such hosts to instead use HTTPS. This is done by libcurl retaining this
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knowledge in an in-memory cache.
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Populate the long \fIbitmask\fP with the correct set of features to instruct
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libcurl how to handle HSTS for the transfers using this handle.
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.SH BITS
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.IP "CURLHSTS_ENABLE"
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Enable the in-memory HSTS cache for this handle.
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.IP "CURLHSTS_READONLYFILE"
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Make the HSTS file (if specified) read-only - makes libcurl not save the cache
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to the file when closing the handle.
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.SH DEFAULT
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0. HSTS is disabled by default.
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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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CURL *curl = curl_easy_init();
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if(curl) {
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curl_easy_setopt(curl, CURLOPT_HSTS_CTRL, CURLHSTS_ENABLE);
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curl_easy_perform(curl);
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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_HSTS "(3), " CURLOPT_CONNECT_TO "(3), " CURLOPT_RESOLVE "(3), "
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.BR CURLOPT_ALTSVC "(3), "
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