diff --git a/jquery.iecors.js b/jquery.iecors.js
index 3c9d418..9bd3554 100755
--- a/jquery.iecors.js
+++ b/jquery.iecors.js
@@ -23,12 +23,11 @@
             var headers = { 'Content-Type': xdr.contentType };
             complete(200, 'OK', { text: xdr.responseText }, headers);
           };
-          
+
           // Apply custom fields if provided
-					if ( s.xhrFields ) {
-            xhr.onerror = s.xhrFields.error;
-            xhr.ontimeout = s.xhrFields.timeout;
-					}
+          if ( s.xdrFields ) {
+            $.extend(xdr, s.xdrFields);
+          }
 
           xdr.open( s.type, s.url );