## NAME

CURLOPT_HEADEROPT - set how to send HTTP headers

## SYNOPSIS

#include <curl/curl.h>

CURLcode curl_easy_setopt(CURL *handle, CURLOPT_HEADEROPT, long bitmask);

## DESCRIPTION

Pass a long that is a bitmask of options of how to deal with headers. The two mutually exclusive options are:

CURLHEADER_UNIFIED - the headers specified in CURLOPT_HTTPHEADER will be used in requests both to servers and proxies. With this option enabled, CURLOPT_PROXYHEADER will not have any effect.

CURLHEADER_SEPARATE - makes CURLOPT_HTTPHEADER headers only get sent to a server and not to a proxy. Proxy headers must be set with CURLOPT_PROXYHEADER 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 CURLOPT_PROXYHEADER headers only to the proxy and then CURLOPT_HTTPHEADER headers only to the server.

## DEFAULT

CURLHEADER_SEPARATE (changed in 7.42.1, ased CURLHEADER_UNIFIED before then)

## PROTOCOLS

HTTP

## EXAMPLE

TODO

## AVAILABILITY

Added in 7.37.0

## RETURN VALUE

Returns CURLE_OK if the option is supported, and CURLE_UNKNOWN_OPTION if not.

## SEE ALSO

CURLOPT_HTTPHEADER, CURLOPT_PROXYHEADER,

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