const http = require('http');const hostname = '127.0.0.1';const port = 3000;const server = http.createServer((req, res) => { ?res.statusCode = 200; ?res.setHeader('Content-Type', 'text/plain'); ?res.end('Hello World\n');});server.listen(port, hostname, () => { ?console.log(`Server running at http://${hostname}:${port}/`);});