CURLOPT_HAPROXYPROTOCOL(3)                            curl_easy_setopt options

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.

       Most applications do not need this option.

DEFAULT
       0, do not send any HAProxy PROXY protocol header

PROTOCOLS
       HTTP

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

AVAILABILITY
       Along with HTTP. Added in 7.60.0.

RETURN VALUE
       Returns CURLE_OK if HTTP is enabled, and CURLE_UNKNOWN_OPTION if not.

libcurl 7.77.0                 November 4, 2020     CURLOPT_HAPROXYPROTOCOL(3)