From fd9a03e147aac7e952c6dda1f381fd4662276ba2 Mon Sep 17 00:00:00 2001
From: Igor Minar <igor@angularjs.org>
Date: Thu, 2 Jan 2014 22:47:39 -0800
Subject: [PATCH] fix(httpBackend): fix 'type mismatch' error on IE8 after each
 request

---
 src/ng/httpBackend.js | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/src/ng/httpBackend.js b/src/ng/httpBackend.js
index c72ae4bbecd6..ffc51abf2957 100644
--- a/src/ng/httpBackend.js
+++ b/src/ng/httpBackend.js
@@ -75,7 +75,9 @@ function createHttpBackend($browser, createXhr, $browserDefer, callbacks, rawDoc
           // onreadystatechange might by called multiple times
           // with readyState === 4 on mobile webkit caused by
           // xhrs that are resolved while the app is in the background (see #5426).
-          xhr.onreadystatechange = undefined;
+          //
+          // we must delete the property instead of setting it to undefined/null to make IE8 happy.
+          delete xhr.onreadystatechange;
 
           var responseHeaders = null,
               response = null;