code: function Response(req, res) {
    if (!(this instanceof Response))
      return new Response(req, res);
  
    EventEmitter.call(this);
  
    this.req = req;
    this.res = res;
    this.sent = false;
    this.readable = false;
    this.writable = true;
    this.statusCode = 200;
    this.res.statusCode = 200;
  
    if (req)
      this.init(req, res);
  }
docs: Response
  @constructor
  @ignore