code: function (_callback)
      {
          if (_callback) {
              _callback = _callback.bind(this._conn);
          } else {
              _callback = this._conn._connect_cb.bind(this._conn);
          }
          var body = this._buildBody();
          this._requests.push(
                  new Strophe.Request(body.tree(),
                      this._onRequestStateChange.bind(
                          this, _callback.bind(this._conn)),
                      body.tree().getAttribute("rid")));
          this._throttledRequestHandler();
      }
docs: PrivateFunction: _no_auth_received
  
  Called on stream start/restart when no stream:features
  has been received and sends a blank poll request.