const http = require('http');
const fs = require('fs');
const path = require('path');
const PORT = 3000;
const ROOT = __dirname;
const MIME = {
  '.html': 'text/html; charset=utf-8', '.css': 'text/css; charset=utf-8',
  '.js': 'application/javascript; charset=utf-8', '.json': 'application/json; charset=utf-8',
  '.md': 'text/plain; charset=utf-8', '.png': 'image/png', '.jpg': 'image/jpeg',
  '.jpeg': 'image/jpeg', '.gif': 'image/gif', '.svg': 'image/svg+xml', '.ico': 'image/x-icon',
};
http.createServer((req, res) => {
  let fp = path.join(ROOT, decodeURIComponent(req.url.split('?')[0]));
  if (fs.existsSync(fp) && fs.statSync(fp).isDirectory()) fp = path.join(fp, 'index.html');
  const ext = path.extname(fp).toLowerCase();
  fs.readFile(fp, (err, data) => {
    if (err) { res.writeHead(404); res.end('404: ' + req.url); return; }
    res.writeHead(200, { 'Content-Type': MIME[ext] || 'application/octet-stream' });
    res.end(data);
  });
}).listen(PORT, () => console.log('Server: http://localhost:' + PORT));