Node HTTP server with delayed response

gistfile1.txt

const http = require('http');
const url = require('url') ;

let server = http.createServer((req, res) => {
    let query = url.parse(req.url, true).query;
    res.writeHead(200, {'Content-Type': 'application/json'});

    setTimeout(() => {
        res.write(JSON.stringify({success: true}));
        res.end();
    }, query.delay);
});

server.listen(8080);