server.js

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

const PORT = 5000;
const PUBLIC_DIR = path.join(__dirname, 'public');

const MIME_TYPES = {
  '.html': 'text/html',
  '.css': 'text/css',
  '.js': 'application/javascript',
  '.json': 'application/json',
  '.png': 'image/png',
  '.jpg': 'image/jpeg',
  '.jpeg': 'image/jpeg',
  '.gif': 'image/gif',
  '.svg': 'image/svg+xml',
  '.ico': 'image/x-icon'
};

const server = http.createServer((req, res) => {
  res.setHeader('Cache-Control', 'no-cache, no-store, must-revalidate');
  res.setHeader('Pragma', 'no-cache');
  res.setHeader('Expires', '0');

  let filePath = req.url === '/' ? '/index.html' : req.url;
  
  if (filePath === '/r') {
    filePath = '/r.html';
  }
  
  const fullPath = path.join(PUBLIC_DIR, filePath);
  const ext = path.extname(fullPath);
  const contentType = MIME_TYPES[ext] || 'application/octet-stream';

  fs.readFile(fullPath, (err, content) => {
    if (err) {
      if (err.code === 'ENOENT') {
        res.writeHead(404, { 'Content-Type': 'text/html' });
        res.end('<h1>404 Not Found</h1>', 'utf-8');
      } else {
        res.writeHead(500);
        res.end(`Server Error: ${err.code}`, 'utf-8');
      }
    } else {
      res.writeHead(200, { 'Content-Type': contentType });
      res.end(content, 'utf-8');
    }
  });
});

server.listen(PORT, '0.0.0.0', () => {
  console.log(`Server running at http://0.0.0.0:${PORT}/`);
});