App.js
const [express, compression] = [require('express'), require('compression')];
const [app, router] = [express(), express.Router()];
app.use(compression());
app.get('/', router);
router.get('/', (req, res) => {
res.status(200).send({messge: 'compressed response'})
});
app.listen(4000, () => {
console.log('server start');
});