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CURLOPT_HEADEROPT(3)	   Library Functions Manual	  CURLOPT_HEADEROPT(3)

NAME
       CURLOPT_HEADEROPT  -  send HTTP headers to both proxy and host or sepa-
       rately

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(3) are
       used in requests	both to	servers	and proxies. With this option enabled,
       CURLOPT_PROXYHEADER(3) does not have any	effect.

       CURLHEADER_SEPARATE - makes CURLOPT_HTTPHEADER(3) headers only get sent
       to  a  server  and  not to a proxy. Proxy headers must be set with CUR-
       LOPT_PROXYHEADER(3) 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 CURLOPT_PROXYHEADER(3)	 headers  only
       to the proxy and	then CURLOPT_HTTPHEADER(3) headers only	to the server.

DEFAULT
       CURLHEADER_SEPARATE  (changed in	7.42.1,	used CURLHEADER_UNIFIED	before
       then)

PROTOCOLS
       This functionality affects http only

EXAMPLE
       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, (long)CURLHEADER_SEPARATE);
	   ret = curl_easy_perform(curl);
	   curl_slist_free_all(list);
	   curl_easy_cleanup(curl);
	 }
       }

AVAILABILITY
       Added in	curl 7.37.0

RETURN VALUE
       curl_easy_setopt(3) returns a CURLcode indicating success or error.

       CURLE_OK	(0) means everything was OK, non-zero means an error occurred,
       see libcurl-errors(3).

SEE ALSO
       CURLOPT_HTTPHEADER(3), CURLOPT_PROXYHEADER(3)

libcurl				  2025-06-03		  CURLOPT_HEADEROPT(3)

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