Redirect Big Ip to <servername>:port/name_app

I am trying this, but isnt working.

 

look my rule:

 

 

when HTTP_REQUEST {

 

set uri_orig [HTTP::uri]

 

 

if {($uri_orig starts_with "/app/enquete")}{

 

log local0. "$uri_orig - pool enquete"

 

pool enquete

 

}

 

else {

 

log local0. "$uri_orig - pool outros"

 

pool oracle_externo

 

}

 

}

 

 

where the pool are my servers:port. But the pool isnt answering and I dont know why. I think is a problem of the Oracle, and I want to log to wich server it is redirecting. Do you know how can I do this?