HTTP Path Modification and Response Rewrite

Good evening..

Seems to me you just want to rewrite URI between client and server. This can be done with [HTTP::uri] no need to collect the HTTP payload and complicated string replacement.

I've just put this very basic iRule together with should illustrate my thinking. I'm just setting a flag on HTTP request so that we know what to change the URI back to on response. Hopefully it might give you some ideas:

when HTTP_REQUEST {
  set uri "/APP_APP1153/APP1153.ashx"
  set g1 0
  set g2 0

  if {[HTTP::uri] equals "/G1/$uri" } {
    [HTTP::uri] $uri
    set g1 1
  }

  if {[HTTP::uri] equals "/G2/$uri" } {
    [HTTP::uri] $uri
    set g2 1
  }  
}

when HTTP_RESPONSE {
  if {$g1} {
    [HTTP::uri] "/G1/$uri"    
  }
  if {$g2} {
    [HTTP::uri] "/G2/$uri"    
  }  
}

PS - I've not tested this (making the most of a delayed train! )