In this episode of Lightboard Lessons, Jason updates an earlier Whiteboard Wednesday with a slight change in flow introduced in TMOS version 12.1. Some of the features in this flow are only applicable if you have hardware or if you have security licenses applied. If that is not the case, just assume a PASS for those blocks.
The HUD chain is the just the protocol filters that trigger on both sides of the proxy. So for example, if you have an https application, you will for sure have tcp, ssl, http filters trigger on the client side of the proxy, then http, ssl, tcp in reverse on the server side of the proxy. HUD is a tribal knowledge name for the proxy from the movie Hudsucker Proxy. :)