text: var http = require('http');
  
  function serve(ip, port) {
    http.createServer(function(req, res) {
      res.writeHead(200, {'Content-Type': 'text/plain'});
      res.end("Hello");
    }).listen(port, ip);
    console.log(`Server running at http://${ip}:${port}/`);
  }
  serve('0.0.0.0', 7999);