HTTP Caching by using serve-static package

server.js

/** 
 * Docs about `serve-static` package:  https://expressjs.com/en/resources/middleware/serve-static.html#setheaders
 * Link on full Glitch project and article about HTTP caching: https://web.dev/codelab-http-cache/
 */ 
const express = require('express');
const app = express();

app.use(express.static('public', {
  etag: true,
  lastModified: true,
  setHeaders: (res, path) => {
    const hashRegExp = new RegExp('\\.[0-9a-f]{8}\\.');
    
    if (path.endsWith('.html')) {
      // All of the project's HTML files end in .html
      res.setHeader('Cache-Control', 'no-cache')
    } else if (hashRegExp.test(path)) {
      // If the RegExp matched, then we have a versioned URL.
      res.setHeader('Cache-Control', 'max-age=31536000');
    }
  }
}));

const listener = app.listen(process.env.PORT, function() {
  console.log('Your server is running on port ' + listener.address().port);
});