docs: function (evt) {
              if (evt.name == "environmentChanged") {
                  if (this._urlService) {
                      this._urlService.$dispose();
                      this._urlService = null;
                  }
  
                  if (this._requestHandler) {
                      this._requestHandler.$dispose();
                      this._requestHandler = null;
                  }
                  return;
              }
          }