Memory-resident variable question

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"
  }
}
when HTTP_RESPONSE {
  if {[HTTP::cookie exists myCookie]}{
     trigger collection for up to 1MB of data if cookie exists
    if {([HTTP::header exists "Content-Length"]) && ([HTTP::header "Content-Length"] <= 1000000)}{
      set content_length [HTTP::header "Content-Length"]
    } else {
        set content_length 1000000
    }
    if { $content_length > 0 } {
      HTTP::collect $content_length
    }
  }
}
when HTTP_RESPONSE_DATA {
   grab client ID to use as session table entry key
  set clientID [findstr [HTTP::payload] "clientID=" 9 &]
  if {$clientID != ""}{
     if key value found, add session table entry with 300 sec timeout
    session add uie $clientID [HTTP::cookie myCookie] 300
  }
}