Neos\Flow\Http\Response::sendHeaders PHP Method

    public function sendHeaders()
    {
        if (headers_sent() === true) {
            return;
        }
        foreach ($this->renderHeaders() as $header) {
            header($header);
        }
        foreach ($this->headers->getCookies() as $cookie) {
            header('Set-Cookie: ' . $cookie, false);
        }
    }