.\" ************************************************************************** .\" * _ _ ____ _ .\" * Project ___| | | | _ \| | .\" * / __| | | | |_) | | .\" * | (__| |_| | _ <| |___ .\" * \___|\___/|_| \_\_____| .\" * .\" * Copyright (C) Daniel Stenberg, , et al. .\" * .\" * This software is licensed as described in the file COPYING, which .\" * you should have received as part of this distribution. The terms .\" * are also available at https://curl.se/docs/copyright.html. .\" * .\" * You may opt to use, copy, modify, merge, publish, distribute and/or sell .\" * copies of the Software, and permit persons to whom the Software is .\" * furnished to do so, under the terms of the COPYING file. .\" * .\" * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY .\" * KIND, either express or implied. .\" * .\" * SPDX-License-Identifier: curl .\" * .\" ************************************************************************** .\" .TH CURLOPT_HEADEROPT 3 "19 Jun 2014" libcurl libcurl .SH NAME CURLOPT_HEADEROPT \- send HTTP headers to both proxy and host or separately .SH SYNOPSIS .nf #include CURLcode curl_easy_setopt(CURL *handle, CURLOPT_HEADEROPT, long bitmask); .fi .SH DESCRIPTION Pass a long that is a bitmask of options of how to deal with headers. The two mutually exclusive options are: \fBCURLHEADER_UNIFIED\fP - the headers specified in \fICURLOPT_HTTPHEADER(3)\fP are used in requests both to servers and proxies. With this option enabled, \fICURLOPT_PROXYHEADER(3)\fP does not have any effect. \fBCURLHEADER_SEPARATE\fP - makes \fICURLOPT_HTTPHEADER(3)\fP headers only get sent to a server and not to a proxy. Proxy headers must be set with \fICURLOPT_PROXYHEADER(3)\fP to get used. Note that if a non-CONNECT request is sent to a proxy, libcurl sends both server headers and proxy headers. When doing CONNECT, libcurl sends \fICURLOPT_PROXYHEADER(3)\fP headers only to the proxy and then \fICURLOPT_HTTPHEADER(3)\fP headers only to the server. .SH DEFAULT CURLHEADER_SEPARATE (changed in 7.42.1, used CURLHEADER_UNIFIED before then) .SH PROTOCOLS HTTP .SH EXAMPLE .nf int main(void) { CURL *curl = curl_easy_init(); if(curl) { CURLcode ret; struct curl_slist *list; list = curl_slist_append(NULL, "Shoesize: 10"); list = curl_slist_append(list, "Accept:"); curl_easy_setopt(curl, CURLOPT_URL, "https://example.com/"); curl_easy_setopt(curl, CURLOPT_PROXY, "http://localhost:8080"); curl_easy_setopt(curl, CURLOPT_HTTPHEADER, list); /* HTTPS over a proxy makes a separate CONNECT to the proxy, so tell libcurl to not send the custom headers to the proxy. Keep them separate! */ curl_easy_setopt(curl, CURLOPT_HEADEROPT, CURLHEADER_SEPARATE); ret = curl_easy_perform(curl); curl_slist_free_all(list); curl_easy_cleanup(curl); } } .fi .SH AVAILABILITY Added in 7.37.0 .SH RETURN VALUE Returns CURLE_OK if the option is supported, and CURLE_UNKNOWN_OPTION if not. .SH "SEE ALSO" .BR CURLOPT_HTTPHEADER (3), .BR CURLOPT_PROXYHEADER (3)