irule for request and response

So, I got some direction...

Here are the three possible paths : 

/x

/y

/z 

Each could have another resource behind the initial path i.e. /x/ping or /x/file or z/path or z/box.

The other resource /ping or /file or /path or /box is what I don't know will be called but needs to be requested to the server and /x, /y, or /z needs to be edited out and only the second resource needs to be sent to server.  

So user puts in /x/ping and /ping gets request to server.  

Similarly, when the response is sent back the first resource needs to be added back. As in if we called /x/ping, x would be add back from the server that only was called /ping.

So.. all that written, let me see how to apply the below with x.  

when HTTP_REQUEST {

  if { [HTTP::uri] starts_with "/x/1" } {

    #Comment:The string map is used to replace the uri value from /uri/1 to /uri/2.   

    HTTP::uri [string map {"/x/1/" "/x/2"} [HTTP::uri]]

    pool pool_x

  }

when HTTP_RESPONSE {

  if { [HTTP::uri] starts_with "/x/2" } {

    HTTP::uri [string map {"/x/2/" "/x/1"} [HTTP::uri]]

  }

So, with the three first resources - x, y, z - and this all being one virtual server, would I just create three irules and apply them all to the one virtual server?  

Happy Irulz Friday.