/**
* Close a connection with an HTTP response.
*
* @param NetworkConnectionInterface $conn
* @param int $code
* @return null
*/
protected function close(NetworkConnectionInterface $conn, $code = 400)
{
$response = new HttpResponse($code, ['Sec-WebSocket-Version' => $this->wsDriver->getVersionHeader()]);
$conn->send($response);
$conn->close();
unset($conn->WebSocket);
}
