Tribblix: manual page: CURLOPT

CURLOPT_PROXYHEADER(3) Introduction to Library Functions

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
request sent to a proxy. The rules for this list is identical to the
CURLOPT_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).