19.1 Overview

The HydraExpress Agent's servlet execution engine, which hosts servlets and Web services, maintains state using sessions. Each session holds data associated with a particular client request.

The servlet execution engine associates a unique ID with the session and returns the ID to the client. When another request arrives from the client, the servlet engine uses the unique ID to attach the session to the request. A service can maintain state with little effort, since the servlet engine handles the mechanics.

This chapter discusses how services manage sessions, how to modify the data in a session, and how to configure sessions for a Web service.

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