I think it was something much simpler: oh, you're navigating to `index.html` without session? You're going to need this CSS, JS and PNG files as well. And the

I think it was something much simpler: oh, you're navigating to `index.html` without session? You're going to need this CSS, JS and PNG files as well. And the idea is that client would already have those files by the time browsers parses `<head>` it already has them all. Except...browser cache exists, so who cares.