iRule to Use Existing Cookie for Persistence Routing

Thank you! This does seem to do the trick. What I am noticing is traffic is only going to one pool member consistently though. The virtual server is set for the new Universal Profile created for this and pointing to the new iRule. The pool members are both set to round-robin and 1:1 in priority group. The UIE profile iRule looks like this:

when HTTP_RESPONSE {
  if { [HTTP::cookie exists "THECOOKIE"] } {
    persist add uie [HTTP::cookie "THECOOKIE"]
    pool po-serverpoolqa-https
  }
}
when HTTP_REQUEST {
  if { [HTTP::cookie exists "THECOOKIE"] } {
    persist uie [HTTP::cookie "THECOOKIE"]
    pool po-serverpoolqa-https
  }
}