server.pre((request, response, next) => {
    response.header('Access-Control-Allow-Origin', '*');
    response.header('Access-Control-Allow-Methods', 'DELETE, GET, HEAD, POST');
    response.header('Access-Control-Allow-Headers', 'Content-Type');
    if (request.method === 'OPTIONS') {
        response.send();
        return next(false);
    }

    return next();
});