<!-- BEGIN COPY / PASTE -->
        const http = require('http');

        const server = http.createServer((req, res) => {
            res.statusCode = 200;
            res.setHeader('Content-Type', 'text/plain');
            res.end('Hello, World!\n');
        });

        const PORT = 3000;
        server.listen(PORT, () => {
            console.log(`Server running at http://localhost:${PORT}/`);
        });
        <!-- END COPY / PASTE -->