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Head First Servlets and JSP, 2nd Edition by Bert Bates, Bryan Basham, Kathy Sierra

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Building the request tracking filter

Our task is to enhance the Beer application so that whenever someone requests any of the resources associated with updating recipes, we’ll be able to keep track of who made the request. Here’s one version of what such a filter might look like.

Note

Filters have no idea who’s going to call them or who’s next in line!

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