code: function (driver, remote, options, deferred, response) {
        this.data = '';
        response.on('data', driver._concatDataChunks.bind(this));
        response.on('end', driver._onResponseEnd.bind(this, driver, response, remote, options, deferred));
        return this;
      }
docs: Response callback function
  
  @method _onResponse
  @param {DalekJs.Internal.Driver} driver Driver instance
  @param {object} remote Dummy request body (function name, url, method)
  @param {object} options Request options (method, port, path, headers, etc.)
  @param {object} deferred Webdriver command deferred
  @param {object} response Response from the webdriver server
  @chainable
  @private