React\HttpClient\Response::pipe PHP Method

    public function pipe(WritableStreamInterface $dest, array $options = [])
    {
        Util::pipe($this, $dest, $options);
        return $dest;
    }

 protected function saveTo()
 {
     $saveTo = $this->options['sink'];
     $writeStream = fopen($saveTo, 'w');
     stream_set_blocking($writeStream, 0);
     $saveToStream = new ReactStream($writeStream, $this->loop);
     $saveToStream->on('end', function () {
         $this->onEnd();
     });
     $this->httpResponse->pipe($saveToStream);
 }