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(3)  will  be  used  in
       requests  both  to  servers  and proxies. With this option enabled, CURLOPT_PROXYHEADER(3)
       will 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 CURLOPT_PROXYHEADER(3) 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(3) headers
       only to the proxy and then CURLOPT_HTTPHEADER(3) headers only to the server.

DEFAULT

       CURLHEADER_SEPARATE (changed in 7.42.1, ased CURLHEADER_UNIFIED before then)

PROTOCOLS

       HTTP

EXAMPLE

       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");

         /* 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_easy_cleanup(curl);
       }

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(3), CURLOPT_PROXYHEADER(3),