server.js

#!/usr/bin/env node
const http = require('http');
const fs = require('fs');
const path = require('path');

const PORT = process.env.PORT || 3000;
const BASE_DIR = __dirname;
const INDEX_PATH = path.join(BASE_DIR, 'index.html');

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

  if (method !== 'GET' && method !== 'HEAD') {
    res.writeHead(405, { 'Content-Type': 'text/plain' });
    res.end('Method Not Allowed');
    return;
  }

  const requestedPath = url === '/' ? INDEX_PATH : path.join(BASE_DIR, url);

  fs.stat(requestedPath, (statErr, stats) => {
    if (statErr || !stats.isFile()) {
      res.writeHead(404, { 'Content-Type': 'text/plain' });
      res.end('Not Found');
      return;
    }

    const ext = path.extname(requestedPath).toLowerCase();
    const contentType = {
      '.html': 'text/html; charset=utf-8',
      '.js': 'text/javascript; charset=utf-8',
      '.css': 'text/css; charset=utf-8',
      '.json': 'application/json; charset=utf-8',
      '.png': 'image/png',
      '.jpg': 'image/jpeg',
      '.jpeg': 'image/jpeg',
      '.gif': 'image/gif'
    }[ext] || 'application/octet-stream';

    const headers = {
      'Content-Type': contentType,
      'Content-Length': stats.size,
      'Cache-Control': 'no-cache'
    };

    res.writeHead(200, headers);

    if (method === 'HEAD') {
      res.end();
      return;
    }

    const fileStream = fs.createReadStream(requestedPath);
    fileStream.pipe(res);
    fileStream.on('error', () => {
      res.destroy();
    });
  });
});

server.listen(PORT, () => {
  console.log(`Server running at http://localhost:${PORT}`);
});