Help with logic on header check irule

OK, so you seem to be saying that /aaa is a special treatment compared to /bbb and /ccc? in which case, I think you're describing this:

when HTTP_REQUEST { 
   switch -glob [HTTP::uri] { 
      "/aaa*" { 
         if { not [string tolower [HTTP::header "User-Agent"]] contains "mozilla" } { 
            pool aaa 
         } else { 
            pool zzz 
         } 
      } 
      "/bbb*" { pool bbb } 
      "/ccc*" { pool ccc } 
   } 
} 

Is that what you mean? You mention needing a default, yet your description doesn't seem to want one at all. Can you clarify?

So a few things I'd point out...

1) You're using [HTTP:host] and then completely ignoring it. Also introducing potential vagueness into the switch - your logic would match, host.com/ccc/aaa/blahblahblah as "/aaa", which is surely not what you want.

2) You're using the Accept header, when you surely mean the User-Agent header?

[EDIT: s/mozilla/Mozilla/ as per Hoolio's comment below ]