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2.5.2 Request attributes
A servlet determines what processing is required by examining the contents of the request object. The data sent as part of the request is called the request attributes. After processing the request, a servlet generates the HTTP response object (HTML, cookies, and so forth) and sends it back to the client.
Servlets also store request attributes or other state information in a memory storage area called the HTTP Session object. This data can be used between client calls to track the current status of an individual client's transactions.