From 27b22f4ef5f3f291204f0e0f9f414ac503f6c8a8 Mon Sep 17 00:00:00 2001
From: hongymagic <d.hong@me.com>
Date: Mon, 11 Nov 2013 13:28:36 +1100
Subject: Fix #14503: Cast to string before setting XHR header. Close gh-1427.

---
 src/ajax/xhr.js | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

(limited to 'src/ajax')

diff --git a/src/ajax/xhr.js b/src/ajax/xhr.js
index fe24b6751..d747093d5 100644
--- a/src/ajax/xhr.js
+++ b/src/ajax/xhr.js
@@ -74,7 +74,15 @@ if ( xhrSupported ) {
 
 					// Set headers
 					for ( i in headers ) {
-						xhr.setRequestHeader( i, headers[ i ] );
+						// Support: IE<9
+						// IE's ActiveXObject throws a 'Type Mismatch' exception when setting
+						// request header to a null-value.
+						//
+						// To keep consistent with other XHR implementations, cast the value
+						// to string and ignore `undefined`.
+						if ( headers[ i ] !== undefined ) {
+							xhr.setRequestHeader( i, headers[ i ] + "" );
+						}
 					}
 
 					// Do send the request
-- 
cgit v1.2.3