ghost/core/server/web/parent/frontend.js

const debug = require('@tryghost/debug')('frontend');
const express = require('../../../shared/express');
const shared = require('../shared');

/**
 *
 * @param {import('../../../frontend/services/routing/router-manager').RouterConfig} routerConfig
 * @returns {import('express').RequestHandler}
 */
module.exports = (routerConfig) => {
    debug('FrontendApp setup start', routerConfig);

    // FRONTEND
    const frontendApp = express('frontend');

    // Force SSL if blog url is set to https. The redirects handling must happen before asset and page routing,
    // otherwise we serve assets/pages with http. This can cause mixed content warnings in the admin client.
    frontendApp.use(shared.middleware.urlRedirects.frontendSSLRedirect);

    frontendApp.lazyUse('/members', require('../members'));
    frontendApp.use('/', require('../../../frontend/web')(routerConfig));

    return frontendApp;
};