_getSiteRouter(req) {
        let siteRouter = null;

        req.app._router.stack.every((router) => {
            if (router.name === 'SiteRouter') {
                siteRouter = router;
                return false;
            }

            return true;
        });

        return siteRouter;
    }
@description Helper function to find the site router in the express router stack.
@param {Object} req
@returns {import('express').Router}
@private