GatewayWorker异步http客户端获得数据后怎么给用户客户端返回?

$loop    = Worker::getEventLoop();
$client  = new \React\HttpClient\Client($loop);
$request = $client->request('GET', 'http://baidu.com');
$request->on('error', function(Exception $e) use($roomId){
    Gateway::sendToGroup($roomId,$e->message);
});
$request->on('response', function ($response) use($roomId){
    $response->on('data', function ($data)  use($roomId){
        Gateway::sendToGroup($roomId,$data);
    });
});
$request->end();