code: function(request, xdrResult) {
          var me = this;
  
          // Using CORS with IE doesn't support readyState so we fake it
          if ((request.xhr && request.xhr.readyState == 4) || me.isXdr) {
              me.clearTimeout(request);
              me.onComplete(request, xdrResult);
              me.cleanup(request);
              Ext.EventManager.idleEvent.fire();
          }
      }
docs: Fires when the state of the xhr changes
  @private
  @param {Object} request The request