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+.\" **************************************************************************
+.\" *                                  _   _ ____  _
+.\" *  Project                     ___| | | |  _ \| |
+.\" *                             / __| | | | |_) | |
+.\" *                            | (__| |_| |  _ <| |___
+.\" *                             \___|\___/|_| \_\_____|
+.\" *
+.\" * Copyright (C) 1998 - 2017, Daniel Stenberg, <daniel@haxx.se>, 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.haxx.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.
+.\" *
+.\" **************************************************************************
+.\"
+.TH CURLOPT_HEADEROPT 3 "19 Jun 2014" "libcurl 7.37.0" "curl_easy_setopt options"
+.SH NAME
+CURLOPT_HEADEROPT \- set how to send HTTP headers
+.SH SYNOPSIS
+#include <curl/curl.h>
+
+CURLcode curl_easy_setopt(CURL *handle, CURLOPT_HEADEROPT, long bitmask);
+.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 will be used in requests both to servers and
+proxies. With this option enabled, \fICURLOPT_PROXYHEADER(3)\fP will 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 will send both server headers and proxy
+headers. When doing CONNECT, libcurl will send \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
+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), " CURLOPT_PROXYHEADER "(3), "