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CURLOPT_HAPROXYPROTOCOL(3) Library Functions Manual 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 proto- col 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 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) libcurl 2026-06-11 CURLOPT_HAPROXYPROTOCOL(3)
NAME | SYNOPSIS | DESCRIPTION | DEFAULT | PROTOCOLS | EXAMPLE | AVAILABILITY | RETURN VALUE | SEE ALSO
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