server.js

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

const PORT = 80;
const ROOT = path.join(__dirname);

const MIME = {
  '.html': 'text/html', '.css': 'text/css', '.js': 'application/javascript',
  '.json': 'application/json', '.png': 'image/png', '.jpg': 'image/jpeg',
  '.gif': 'image/gif', '.svg': 'image/svg+xml', '.ico': 'image/x-icon',
  '.woff': 'font/woff', '.woff2': 'font/woff2', '.mp4': 'video/mp4',
};

const server = http.createServer((req, res) => {
  let filePath = path.join(ROOT, req.url === '/' ? 'index.html' : req.url);
  filePath = path.normalize(filePath);
  if (!filePath.startsWith(ROOT)) { res.writeHead(403); res.end(); return; }

  fs.stat(filePath, (err, stats) => {
    if (err || !stats.isFile()) {
      // SPA fallback
      filePath = path.join(ROOT, 'index.html');
    }
    const ext = path.extname(filePath);
    const mime = MIME[ext] || 'application/octet-stream';
    res.writeHead(200, { 'Content-Type': mime, 'Cache-Control': 'public, max-age=3600' });
    fs.createReadStream(filePath).pipe(res);
  });
});

server.listen(PORT, '0.0.0.0', () => {
  console.log(`Raptor Predictor serving on http://0.0.0.0:${PORT}`);
});