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.TH CURLOPT_PROXYHEADER 3 "January 02, 2023" "libcurl 7.88.1" "curl_easy_setopt options"

.SH NAME
CURLOPT_PROXYHEADER \- set of HTTP headers to pass to proxy
.SH SYNOPSIS
.nf
#include <curl/curl.h>

CURLcode curl_easy_setopt(CURL *handle, CURLOPT_PROXYHEADER,
                          struct curl_slist *headers);
.SH 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
\fICURLOPT_HTTPHEADER(3)\fP option's.

The headers set with this option is only ever used in requests sent to a proxy
- when there's 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 will only cause your request to send an invalid header.

Pass a NULL to this to reset back to no custom headers.
.SH DEFAULT
NULL
.SH PROTOCOLS
HTTP
.SH EXAMPLE
.nf
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 */
}
.fi
.SH AVAILABILITY
Added in 7.37.0
.SH RETURN VALUE
Returns CURLE_OK if the option is supported, and CURLE_UNKNOWN_OPTION if not.
.SH "SEE ALSO"
.BR CURLOPT_HEADEROPT "(3), " CURLOPT_HTTPHEADER "(3), "