iRule to Log When Pool Member does not Respond to HTTP Request

If the pool member never responds to the HTTP requests sent from F5 over an open TCP connection, the F5 will ultimately close this connection*, so you can try something like:

set http_data_received 0

when HTTP_RESPONSE {

   set http_data_received 1

}

when SERVER_CLOSED {

  if (not (http_data_received)) {

   #splunk logic here

  }

}

* not sure what is the behavior for keep-alive connections