CURLOPT_HAPROXY_CLIENT_IP - Man Page

#include <curl/curl.h>

CURLcode curl_easy_setopt(CURL *handle, CURLOPT_HAPROXY_CLIENT_IP,
                          char *client_ip);

When this parameter is set to a valid IPv4 or IPv6 numerical address, the library sends this address as client address in the HAProxy PROXY protocol v1 header at beginning of the connection.

This option is an alternative to CURLOPT_HAPROXYPROTOCOL(3) as that one cannot use a specified address.

NULL, no HAProxy header is sent

All

int main(void)
{
  CURL *curl = curl_easy_init();
  if(curl) {
    CURLcode ret;
    curl_easy_setopt(curl, CURLOPT_URL, "https://example.com/");
    curl_easy_setopt(curl, CURLOPT_HAPROXY_CLIENT_IP, "1.1.1.1");
    ret = curl_easy_perform(curl);
  }
}

Along with HTTP. Added in 8.2.0.

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

CURLOPT_HAPROXYPROTOCOL(3), CURLOPT_PROXY(3)

curl_easy_setopt(3), libcurl-symbols(3).