irule stream::exporession and data group list

Hello all,

thanks for all the input. What I finally put together:

I created 2 data group lists testin and testout

I linked the default stream profile to my virtual server, as well as the below irule.

when HTTP_RESPONSE {
set listlengte [llength [class get testin]]
set streamexpression ""
foreach {stringin} [class get testin] {stringout} [class get testout]
    {
        set streamexpression [concat $streamexpression "@[lindex $stringin 1]@[lindex $stringout 1]@"]
    }
set streamexpression [string map {"@ @" "@@"} $streamexpression]
STREAM::expression $streamexpression
STREAM::enable
} 

All I need to do is to add the part that disabls chunking:

when HTTP_REQUEST {
   Don't allow data to be chunked
  if { 
[HTTP::version] eq "1.1" } {
    if { [HTTP::header is_keepalive] } {
       
 HTTP::header replace "Connection" "Keep-Alive"
    }
    
HTTP::version "1.0"
  }
}

Is there anyone that can estimate the impact (performance wise) of an iRule like this? I used the foreach instead of the 'heavier' for loop, and I used string map instead of string replace, so I would expect it to be 'as light as possible'. If anyone can think of ways to make it even lighter, please let me know.

Yves