HTTP Path Modification and Response Rewrite

You can try this code (not tested) with a stream profile assigned to the virtual server

when HTTP_REQUEST {
    set uri "/APP_APP1153/APP1153.ashx"
    set g1 0
    set g2 0
     disable compression to support stream profile
    HTTP::header remove "Accept-Encoding"
    if {[HTTP::uri] equals "/G1$uri" } {
        [HTTP::uri] $uri
        set stream_expression "@$uri@/G2$uri@"
        set baseURI /G1
    }

    if {[HTTP::uri] equals "/G2$uri" } {
        [HTTP::uri] $uri
        set stream_expression "@$uri@/G2$uri@"
        set baseURI /G2
    }  
}

when HTTP_RESPONSE {
    if { [HTTP::status] == 302  {
         This is a 302 redirect with a absolute Location URI
        if {[scan [HTTP::header Location] {%[^:]://%[^/]%s} location_proto location_host location_uri] == 3} {
             The Location header is absolute URI
            HTTP::header replace Location $location_proto://$location_host$baseURI$uri
        } else {
             The Location header is absolute URI
            HTTP::header replace Location $baseURI[HTTP::header Location]
        }
    } elseif {[HTTP::header value Content-Type] starts_with "text"} {
         Apply stream expression stored in RULE_INIT event
        if {$stream_profile_enabled} {
            STREAM::expression $stream_expression

             Enable the stream filter for this response only
            STREAM::enable
        }
    }
}