Find the Websphere Commerce App server where request goes

To identify which app server we are hitting , we can use the clone ID in jsession cookie

Get the JSESSION cookie from browser. 

The second part following ":" is the clone iD.

Once you get it, you can go to Was Profile / Deployment Manager/config/cells/../nodes/../servers/web server/plugin-cfg.xml and search for the clone id to get the server name.