From c0a796b3e31de4f22eef00d93164e7238d9aa3ba Mon Sep 17 00:00:00 2001
From: Jarrett Cruger <jcrugzz@gmail.com>
Date: Wed, 17 Sep 2014 07:53:18 -0400
Subject: [PATCH] [fix] perf optimization so we have a precompiled regexp

---
 lib/http-proxy/common.js | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/lib/http-proxy/common.js b/lib/http-proxy/common.js
index 52cb0ff7c..7c374b0c8 100644
--- a/lib/http-proxy/common.js
+++ b/lib/http-proxy/common.js
@@ -2,6 +2,7 @@ var common = exports,
     url    = require('url'),
     extend = require('util')._extend;
 
+var upgradeHeader = /(^|,)\s*upgrade\s*($|,)/i;
 /**
  * Copies the right headers from `options` and `req` to
  * `outgoing` which is then used to fire the proxied
@@ -53,7 +54,7 @@ common.setupOutgoing = function(outgoing, options, req, forward) {
   if (!outgoing.agent) {
     outgoing.headers = outgoing.headers || {};
     if (typeof outgoing.headers.connection !== 'string'
-        || ! /(^|,)\s*upgrade\s*($|,)/i.test(outgoing.headers.connection)
+        || ! upgradeHeader.test(outgoing.headers.connection)
        ) { outgoing.headers.connection = 'close'; }
   }