1. A data service system, comprising: a plurality of web servers, each servicing any request received by the data service system; a plurality of application servers, each processing any request directed from any one of the web servers; a session state information managing system called by each of the application servers to allow different application servers to process requests belonging to a single session without requiring the requests to carry their entire session state information, wherein processing of each of the requests requires the session state information of that request.