const sleep = (time) => new Promise((resolve) => setTimeout(resolve, time));
require('http')
.createServer((req, res) => {
if (req.url === '/a') {
res.writeHead(200, { 'content-type': 'text/html' });
res.end(`
`);
} else if (req.url === '/b') {
sleep(1000).then(() => {
res.writeHead(200, { 'content-type': 'text/html' });
res.end(`
`);
});
} else res.destroy();
})
.listen(3000, () => console.log('http://localhost:3000'));