the-biergarten-app/web/frontend/server.js

import { createRequestHandler } from '@react-router/express';
import express from 'express';

const app = express();

app.use('/assets', express.static('build/client/assets', { immutable: true, maxAge: '1y' }));
app.use(express.static('build/client', { maxAge: '1h' }));

// Answers from Express alone so the container health check reports on this
// process only, independent of whether the API is reachable yet.
app.get('/healthz', (_req, res) => {
    res.status(200).type('text/plain').send('ok');
});

const requestHandler = createRequestHandler({
    build: () => import('./build/server/index.js'),
});
app.all('/', requestHandler);
app.all('/*splat', requestHandler);

const port = process.env.PORT || 3000;
app.listen(port, () => {
    console.log(`Server listening on port ${port}`);
});