private void sendGetOnlyOptions(HttpServletRequest request, HttpServletResponse response) {
        response.setHeader("Allow", "GET, HEAD, OPTIONS");
        response.setHeader("Access-Control-Allow-Methods", "GET, HEAD, POST, OPTIONS");
        response.setContentType("application/octet-stream");
        response.setContentLength(0);
    }
@see jakarta.servlet.http.HttpServlet#doPost(jakarta.servlet.http.HttpServletRequest,
     jakarta.servlet.http.HttpServletResponse)
src/nu/validator/servlet/VerifierServlet.java