CURLOPT_PROXYHEADER(3) - Man pages

CURLOPT_PROXYHEADER(3)      Library Functions Manual     CURLOPT_PROXYHEADER(3)

NAME
       CURLOPT_PROXYHEADER - set of HTTP headers to pass to proxy

SYNOPSIS
       #include <curl/curl.h>

       CURLcode curl_easy_setopt(CURL *handle, CURLOPT_PROXYHEADER,
                                 struct curl_slist *headers);

DESCRIPTION
       Pass a pointer to a linked list of HTTP headers to pass in your HTTP re-
       quest  sent to a proxy. The rules for this list is identical to the CUR-
       LOPT_HTTPHEADER(3) option's.

       The headers set with this option is only ever used in requests sent to a
       proxy - when there is also a request sent to a host.

       The first line in a request (containing the method,  usually  a  GET  or
       POST) is NOT a header and cannot be replaced using this option. Only the
       lines following the request-line are headers. Adding this method line in
       this list of headers causes your request to send an invalid header.

       Using  this  option  multiple times makes the last set list override the
       previous ones. Set it to NULL to disable its use again.

       libcurl does not copy the list, it needs to be kept around  until  after
       the transfer has completed.

DEFAULT
       NULL

PROTOCOLS
       This functionality affects all supported protocols

EXAMPLE
       int main(void)
       {
         CURL *curl = curl_easy_init();

         struct curl_slist *list;

         if(curl) {
           curl_easy_setopt(curl, CURLOPT_URL, "https://example.com");
           curl_easy_setopt(curl, CURLOPT_PROXY, "http://proxy.example.com:80");

           list = curl_slist_append(NULL, "Shoesize: 10");
           list = curl_slist_append(list, "Accept:");

           curl_easy_setopt(curl, CURLOPT_PROXYHEADER, list);

           curl_easy_perform(curl);

           curl_slist_free_all(list); /* free the list again */
         }
       }

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_HEADEROPT(3), CURLOPT_HTTPHEADER(3)

libcurl                            2026-07-12            CURLOPT_PROXYHEADER(3)

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