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125 lines
5.4 KiB
Groff
125 lines
5.4 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) 1998 - 2020, 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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.\" **************************************************************************
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.\"
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.TH CURLOPT_HTTPHEADER 3 "17 Jun 2014" "libcurl 7.37.0" "curl_easy_setopt options"
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.SH NAME
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CURLOPT_HTTPHEADER \- set custom HTTP headers
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.SH SYNOPSIS
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#include <curl/curl.h>
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CURLcode curl_easy_setopt(CURL *handle, CURLOPT_HTTPHEADER, struct curl_slist *headers);
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.SH DESCRIPTION
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Pass a pointer to a linked list of HTTP headers to pass to the server and/or
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proxy in your HTTP request. The same list can be used for both host and proxy
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requests!
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The linked list should be a fully valid list of \fBstruct curl_slist\fP
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structs properly filled in. Use \fIcurl_slist_append(3)\fP to create the list
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and \fIcurl_slist_free_all(3)\fP to clean up an entire list. If you add a
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header that is otherwise generated and used by libcurl internally, your added
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one will be used instead. If you add a header with no content as in 'Accept:'
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(no data on the right side of the colon), the internally used header will get
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disabled. With this option you can add new headers, replace internal headers
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and remove internal headers. To add a header with no content (nothing to the
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right side of the colon), use the form 'MyHeader;' (note the ending
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semicolon).
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The headers included in the linked list \fBmust not\fP be CRLF-terminated,
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because libcurl adds CRLF after each header item. Failure to comply with this
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will result in strange bugs because the server will most likely ignore part of
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the headers you specified.
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The first line in a request (containing the method, usually a GET or POST) is
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not a header and cannot be replaced using this option. Only the lines
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following the request-line are headers. Adding this method line in this list
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of headers will only cause your request to send an invalid header. Use
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\fICURLOPT_CUSTOMREQUEST(3)\fP to change the method.
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When this option is passed to \fIcurl_easy_setopt(3)\fP, libcurl will not copy
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the entire list so you \fBmust\fP keep it around until you no longer use this
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\fIhandle\fP for a transfer before you call \fIcurl_slist_free_all(3)\fP on
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the list.
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Pass a NULL to this option to reset back to no custom headers.
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The most commonly replaced headers have "shortcuts" in the options
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\fICURLOPT_COOKIE(3)\fP, \fICURLOPT_USERAGENT(3)\fP and
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\fICURLOPT_REFERER(3)\fP. We recommend using those.
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There's an alternative option that sets or replaces headers only for requests
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that are sent with CONNECT to a proxy: \fICURLOPT_PROXYHEADER(3)\fP. Use
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\fICURLOPT_HEADEROPT(3)\fP to control the behavior.
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.SH SECURITY CONCERNS
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By default, this option makes libcurl send the given headers in all HTTP
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requests done by this handle. You should therefore use this option with
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caution if you for example connect to the remote site using a proxy and a
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CONNECT request, you should to consider if that proxy is supposed to also get
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the headers. They may be private or otherwise sensitive to leak.
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Use \fICURLOPT_HEADEROPT(3)\fP to make the headers only get sent to where you
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intend them to get sent.
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Custom headers are sent in all requests done by the easy handles, which
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implies that if you tell libcurl to follow redirects
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(\fICURLOPT_FOLLOWLOCATION(3)\fP), the same set of custom headers will be sent
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in the subsequent request. Redirects can of course go to other hosts and thus
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those servers will get all the contents of your custom headers too.
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Starting in 7.58.0, libcurl will specifically prevent "Authorization:" headers
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from being sent to other hosts than the first used one, unless specifically
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permitted with the \fICURLOPT_UNRESTRICTED_AUTH(3)\fP option.
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Starting in 7.64.0, libcurl will specifically prevent "Cookie:" headers
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from being sent to other hosts than the first used one, unless specifically
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permitted with the \fICURLOPT_UNRESTRICTED_AUTH(3)\fP option.
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.SH DEFAULT
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NULL
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.SH PROTOCOLS
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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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struct curl_slist *list = NULL;
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if(curl) {
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curl_easy_setopt(curl, CURLOPT_URL, "https://example.com");
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list = curl_slist_append(list, "Shoesize: 10");
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list = curl_slist_append(list, "Accept:");
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curl_easy_setopt(curl, CURLOPT_HTTPHEADER, list);
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curl_easy_perform(curl);
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curl_slist_free_all(list); /* free the list again */
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}
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.fi
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.SH AVAILABILITY
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As long as HTTP is enabled
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.SH RETURN VALUE
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Returns CURLE_OK if HTTP is supported, and CURLE_UNKNOWN_OPTION if not.
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.SH "SEE ALSO"
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.BR CURLOPT_CUSTOMREQUEST "(3), " CURLOPT_HEADEROPT "(3), "
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.BR CURLOPT_PROXYHEADER "(3), " CURLOPT_HEADER "(3)"
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