Irule help 302 + maintain URI

Are you looking for feedback on your design as well, or just on how to accomplish this?

I think you'll have to use your command from the HTTP_RESPONSE event and I believe HTTP::respond from that event can cause some functions to break, so you'll likely want to use header location replace.

Something like this:

when HTTP_RESPONSE {
  HTTP::header replace "Location" [IP::server_addr] }}