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deps/curl/docs/libcurl/opts/CURLOPT_HAPROXYPROTOCOL.md

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+---
+c: Copyright (C) Daniel Stenberg, <daniel.se>, et al.
+SPDX-License-Identifier: curl
+Title: CURLOPT_HAPROXYPROTOCOL
+Section: 3
+Source: libcurl
+See-also:
+  - CURLOPT_PROXY (3)
+---
+
+# NAME
+
+CURLOPT_HAPROXYPROTOCOL - send HAProxy PROXY protocol v1 header
+
+# SYNOPSIS
+
+~~~c
+#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
+
+~~~c
+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_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.