Advanced Express Web Application Development

Compression

We can improve page load times further by compressing static files. Express includes the compress middleware, which will gzip an HTTP response. Let's edit the Express server, /vision-web/lib/express/index.js, and add the compress middleware, as follows:

app.set('views', 'views');
app.use(express.logger({ immediate: true, format: 'dev' }));
app.use(express.compress());

If you visit the homepage for our application and check the response headers via your browser tools for all of the resources served, you should see this:

Content-Encoding: gzip