CURLOPT_HAPROXYPROTOCOL(3)

NAME
CURLOPT_HAPROXYPROTOCOL - send HAProxy PROXY protocol v1 header

SYNOPSIS
#include <curl/curl.h>
CURLcode curl_easy_setopt(CURL *handle, CURLOPT_HAPROXYPROTOCOL,
                          long haproxy_protocol);

DESCRIPTION
A long parameter set to 1 tells the library to send an HAProxy PROXY protocol v1 header at beginning of the connection. The default action is not to send this header. This option is primarily useful when sending test requests to a service that expects this header. Note that the HAProxy protocol message is only is sent over a freshly setup connection. A subsequent transfer that reuses a previous connection does not send it again. Most applications do not need this option.

DEFAULT
0, do not send any HAProxy PROXY protocol header

PROTOCOLS
This functionality affects all supported protocols

EXAMPLE
int main(void)
{
  CURL *curl = curl_easy_init();
  if(curl) {
    CURLcode result;
    curl_easy_setopt(curl, CURLOPT_URL, "https://example.com/");
    curl_easy_setopt(curl, CURLOPT_HAPROXYPROTOCOL, 1L);
    result = curl_easy_perform(curl);
  }
}

AVAILABILITY
Added in curl 7.60.0

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_PROXY(3)