Ajax: support non-RFC2616 methods for oldIE

Closes gh-1466
Fixes #13240

1 files changed, 13 insertions, 2 deletions

diff --git a/src/ajax/xhr.js b/src/ajax/xhr.js
index d747093d5..0f560f45a 100644
--- a/src/ajax/xhr.js
+++ b/src/ajax/xhr.js
@@ -8,9 +8,20 @@ define([
 // (This is still attached to ajaxSettings for backward compatibility)
 jQuery.ajaxSettings.xhr = window.ActiveXObject !== undefined ?
 	// Support: IE6+
-	// XHR cannot access local files, always use ActiveX for that case
 	function() {
-		return !this.isLocal && createStandardXHR() || createActiveXHR();
+
+		// XHR cannot access local files, always use ActiveX for that case
+		return !this.isLocal &&
+
+			// Support: IE7-8
+			// oldIE XHR does not support non-RFC2616 methods (#13240)
+			// See http://msdn.microsoft.com/en-us/library/ie/ms536648(v=vs.85).aspx
+			// and http://www.w3.org/Protocols/rfc2616/rfc2616-sec9.html#sec9
+			// Although this check for six methods instead of eight
+			// since IE also does not support "trace" and "connect"
+			/^(get|post|head|put|delete|options)$/i.test( this.type ) &&
+
+			createStandardXHR() || createActiveXHR();
 	} :
 	// For all other browsers, use the standard XMLHttpRequest object
 	createStandardXHR;