2.10. Session Tracking
This section briefly introduces the servlet session-tracking API, which keeps track of visitors as they move around at your site. For additional details and examples, see Chapter 9 of Core Servlets and JavaServer Pages (in PDF at http://www.moreservlets.com).
The Need for Session Tracking
HTTP is a “stateless” protocol: each time a client retrieves a Web page, it opens a separate connection to the Web server. The server does not automatically maintain contextual information about a client. Even with servers that support persistent (keep-alive) HTTP connections and keep a socket open for multiple client requests that occur close together in time, there is no built-in support for maintaining contextual information. This ...
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