const fs = require('fs');
const http = require('http');
const path = require('path');

http.createServer((req, res) => {

  const filePath = path.join(__dirname, req.url);

  fs.stat(filePath, (err, stats) => {
    if (!err && stats.isFile()) {
      res.writeHead(200);
      fs.createReadStream(filePath).pipe(res);
    } else {
      res.writeHead(404);
      res.end('Not Found'); 
    }
  });

}).listen(3000);