text: const http = require('http');
  const serveStatic = require('serve-static');
  
  const serve = serveStatic('.', {
    setHeaders: (res, path) => {
      res.setHeader('Content-Security-Policy', "default-src 'self' https://cdn.jsdelivr.net/");
    },
  });
  
  const server = http.createServer((req, res) => {
    serve(req, res, () => {
      res.statusCode = 404;
      res.end();
    });
  });
  
  // Listen
  server.listen(3000);
  