This appears to be limited to explaining the server side, which is only a tiny fraction of actual web applications. In practice, the client side is often equally important, or even more so than the server side.

And an example of a Prolog web application would be Swish, the online prolog IDE: http://swish.swi-prolog.org/

Thanks. I'm supposed to call my ISP and tell them I'm over 18 to access the site, apparently. Can't even begin to fathom why the what.