Aerys\Websocket\Handshake::end PHP Méthode

    public function end(string $finalBodyChunk = null)
    {
        if ($this->status === 101 && isset($finalBodyChunk)) {
            throw new \DomainException("Cannot end() with body data; entity body content disallowed for Switching Protocols Response");
        }
        if (!$this->isStarted) {
            $this->handshake();
        }
        $this->isStarted = true;
        $this->response->end($finalBodyChunk);
        return $this;
    }