Replace SID to SERVICE_NAME in Oracle connnection string

Can you open up the tcpdump to look at the complete transaction? When I tested with a cURL client and a POST request, the first packet contained the headers so they didn't match the criteria and went to the default pool. I assumed, because of the way you had written the previous version, that the sqlplus client didn't have that problem. So please look to see if ALL of the data from the client is being directed to the same pool (and not just the payload).