handleCaching = function handleCachingCors(req, res, next) {
    const method = req.method && req.method.toUpperCase && req.method.toUpperCase();
    if (method === 'OPTIONS') {
        // @NOTE: try to add native support for dynamic 'vary' header value in 'cors' module
        res.vary('Origin');
    }
    next();
}
@param {Express.Request} req
@param {Express.Response} res
@param {Function} next