CURLOPT_HAPROXYPROTOCOL: support the HAProxy PROXY protocol

Add --haproxy-protocol for the command line tool

Closes #2162

4 files changed, 61 insertions, 0 deletions

diff --git a/docs/libcurl/curl_easy_setopt.3 b/docs/libcurl/curl_easy_setopt.3
index 1efb467e6..b7d67f360 100644
--- a/docs/libcurl/curl_easy_setopt.3
+++ b/docs/libcurl/curl_easy_setopt.3
@@ -185,6 +185,8 @@ Socks5 GSSAPI service name. \fICURLOPT_SOCKS5_GSSAPI_SERVICE(3)\fP
 Socks5 GSSAPI NEC mode. See \fICURLOPT_SOCKS5_GSSAPI_NEC(3)\fP
 .IP CURLOPT_PROXY_SERVICE_NAME
 Proxy authentication service name. \fICURLOPT_PROXY_SERVICE_NAME(3)\fP
+.IP CURLOPT_HAPROXYPROTOCOL
+Send an HAProxy PROXY protocol header. See \fICURLOPT_HAPROXYPROTOCOL(3)\fP
 .IP CURLOPT_SERVICE_NAME
 Authentication service name. \fICURLOPT_SERVICE_NAME(3)\fP
 .IP CURLOPT_INTERFACE
diff --git a/docs/libcurl/opts/CURLOPT_HAPROXYPROTOCOL.3 b/docs/libcurl/opts/CURLOPT_HAPROXYPROTOCOL.3
new file mode 100644
index 000000000..01e667d16
--- /dev/null
+++ b/docs/libcurl/opts/CURLOPT_HAPROXYPROTOCOL.3
@@ -0,0 +1,57 @@
+.\" **************************************************************************
+.\" *                                  _   _ ____  _
+.\" *  Project                     ___| | | |  _ \| |
+.\" *                             / __| | | | |_) | |
+.\" *                            | (__| |_| |  _ <| |___
+.\" *                             \___|\___/|_| \_\_____|
+.\" *
+.\" * Copyright (C) 1998 - 2017, Daniel Stenberg, <daniel@haxx.se>, et al.
+.\" *
+.\" * This software is licensed as described in the file COPYING, which
+.\" * you should have received as part of this distribution. The terms
+.\" * are also available at https://curl.haxx.se/docs/copyright.html.
+.\" *
+.\" * You may opt to use, copy, modify, merge, publish, distribute and/or sell
+.\" * copies of the Software, and permit persons to whom the Software is
+.\" * furnished to do so, under the terms of the COPYING file.
+.\" *
+.\" * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
+.\" * KIND, either express or implied.
+.\" *
+.\" **************************************************************************
+.\"
+.TH CURLOPT_HAPROXYPROTOCOL 3 "5 Feb 2018" "libcurl 7.60.0" "curl_easy_setopt options"
+.SH NAME
+CURLOPT_HAPROXYPROTOCOL \- send HAProxy PROXY protocol header
+.SH SYNOPSIS
+#include <curl/curl.h>
+
+CURLcode curl_easy_setopt(CURL *handle, CURLOPT_HAPROXYPROTOCOL,
+                          long haproxy_protocol);
+.SH DESCRIPTION
+A long parameter set to 1 tells the library to send an HAProxy PROXY
+protocol 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.
+.SH DEFAULT
+0, do not send HAProxy PROXY protocol header
+.SH PROTOCOLS
+HTTP
+.SH EXAMPLE
+.nf
+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);
+}
+.fi
+.SH AVAILABILITY
+Along with HTTP. Added in 7.60.0.
+.SH RETURN VALUE
+Returns CURLE_OK if HTTP is enabled, and CURLE_UNKNOWN_OPTION if not.
diff --git a/docs/libcurl/opts/Makefile.inc b/docs/libcurl/opts/Makefile.inc
index 2aa1acf33..b370082d6 100644
--- a/docs/libcurl/opts/Makefile.inc
+++ b/docs/libcurl/opts/Makefile.inc
@@ -137,6 +137,7 @@ man_MANS =                                      \
   CURLOPT_FTP_USE_PRET.3                        \
   CURLOPT_GSSAPI_DELEGATION.3                   \
   CURLOPT_HAPPY_EYEBALLS_TIMEOUT_MS.3           \
+  CURLOPT_HAPROXYPROTOCOL.3                     \
   CURLOPT_HEADER.3                              \
   CURLOPT_HEADERDATA.3                          \
   CURLOPT_HEADERFUNCTION.3                      \
diff --git a/docs/libcurl/symbols-in-versions b/docs/libcurl/symbols-in-versions
index c58086fb7..2877de7f1 100644
--- a/docs/libcurl/symbols-in-versions
+++ b/docs/libcurl/symbols-in-versions
@@ -404,6 +404,7 @@ CURLOPT_FTP_USE_EPSV            7.9.2
 CURLOPT_FTP_USE_PRET            7.20.0
 CURLOPT_GSSAPI_DELEGATION       7.22.0
 CURLOPT_HAPPY_EYEBALLS_TIMEOUT_MS 7.59.0
+CURLOPT_HAPROXYPROTOCOL         7.60.0
 CURLOPT_HEADER                  7.1
 CURLOPT_HEADERDATA              7.10
 CURLOPT_HEADERFUNCTION          7.7.2