text: const http = require('http');
  const fs = require('fs');
  
  const server = http.createServer((req, res) => {
  	if (req.url === '/style.css') {
  		fs.createReadStream('./style.css').pipe(res);
  		return;
  	} 
  	if (req.url === '/index.html') {
  		fs.createReadStream('./index.html').pipe(res);
  		return;
  	}
  	res.end('hello world');
  });
  
  server.listen(3000, () => {
  	console.log(`server is listen at 3000`);
  });