Red Hat NETSCAPE ENTERPRISE SERVER 6.0 - NSAPI PROGRAMMER GUIDE Manuel d'utilisateur télécharger pdf (Page 55)

Chapter 6

Session Managers

Session objects maintain state and user identity across multiple page requests over

the normally stateless HTTP protocol. A session persists for a specified time

period, across more than one connection or page request from the user. A session

usually corresponds to one user, who may visit a site many times. The server can

maintain a session either by using cookies or by rewriting URLs. Servlets can

access the session objects to retrieve state information about the session.

This appendix has the following sections:

• Session Overview

• Specifying a Session Manager

• IWSSessionManager

• MMapSessionManager (Unix Only)

• Deprecated Session Managers

• Load Balancing, Session Failover, and Session IDs

Session Overview

An HTTP session represents the server’s view of the session. The server considers a

session new under these conditions:

• The client does not yet know about the session.

• The session has not yet begun.

A session manager automatically creates new session objects whenever a new

session starts. In some circumstances, clients do not join the session, for example, if

the session manager uses cookies and the client does not accept cookies.

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Red Hat NETSCAPE ENTERPRISE SERVER 6.0 - NSAPI PROGRAMMER GUIDE Manuel d'utilisateur Page 55