server.js

const http = require("http");
const fs = require("fs");

const PORT = process.env.PORT || 3000

const server = http.createServer((req, res) => {
  console.log(req.url, req.method);

  res.setHeader("Content-Type", "text/html");

  let path = './';
  switch (req.url) {
    case '/':
      path += 'index.html';
      res.statusCode = 200;
      break;
    case '/about':
      path += 'about.html';
      res.statusCode = 200;
      break;
    default:
      path += '404.html';
      res.statusCode = 404;
      break;
  }


  fs.readFile(path, (err, data) => {
    if (err) {
      console.log(err);
      res.end();
    } else {
      res.end(data);
    }
  })
});

server.listen(PORT, () => console.log(`Server listening on port ${PORT}`))