From 2d42709c3283637de16a49e815b03e63432bbd29 Mon Sep 17 00:00:00 2001
From: indexzero <charlie.robbins@gmail.com>
Date: Thu, 26 Dec 2013 23:59:48 -0800
Subject: [PATCH] [fix] Optimize fix for `x-forwarded-for-port`.

---
 lib/node-http-proxy/http-proxy.js | 19 ++++++++++++-------
 1 file changed, 12 insertions(+), 7 deletions(-)

diff --git a/lib/node-http-proxy/http-proxy.js b/lib/node-http-proxy/http-proxy.js
index f453db8..43a6489 100644
--- a/lib/node-http-proxy/http-proxy.js
+++ b/lib/node-http-proxy/http-proxy.js
@@ -30,6 +30,13 @@ var events = require('events'),
     url = require('url'),
     httpProxy = require('../node-http-proxy');
 
+//
+// @private {RegExp} extractPort
+// Reusable regular expression for getting the
+// port from a host string.
+//
+var extractPort = /:(\d+)$/;
+
 //
 // ### function HttpProxy (options)
 // #### @options {Object} Options for this instance.
@@ -957,14 +964,12 @@ HttpProxy.prototype._forwardRequest = function (req) {
 };
 
 function getPortFromHostHeader(req) {
-  var portMatch = req.headers.host.match(/:(\d+)$/);
+  var match;
+  if ((match = extractPort.exec(req.headers.host))) {
+    return parseInt(match[1]);
+  }
 
-  if(portMatch) {
-    return parseInt(portMatch[1]);
-  }
-  else {
-    return getProto(req) === 'https' ? 443 : 80;
-  }
+  return getProto(req) === 'https' ? 443 : 80;
 }
 
 function getProto(req) {