How to filter within iRule for HTTP_RESPONSE

Well, there might be a few ways to do this.

1. If you can modify the application(s) to throw in some specific response header or maybe metatag, you can filter on that in the response.

2. In most cases the HTTP request and response are an atomic pair, so:

   when HTTP_REQUEST {
       set flag ""
       if { something } {
           set flag "true"
       } elseif { something_else } {
           set flag "false"
       }        
   }
   when HTTP_RESPONSE {
       if { [info exist flag] } {
           switch $flag {
               "true" {
                   do something
               }
               "false" {
                   do something_else
               }
           }
       }
   }