irule for URI based redirection to separate Pools

Maybe you can do like that:

    when HTTP_REQUEST {
      set path [string tolower [lindex [split [HTTP::path] "/"] 1]]
      switch -glob $path {
        "dev" { pool pool-dev }
        "ct" { pool pool-ct }
        "uat" { pool pool-uat }
        default {
            HTTP::respond 200 content "Content-Type "text/html" Connection Close"
        }
      }
    }

You can get an iFile or base64 variable content to present the html too. Find some examples in this channel.

Regards.