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Request and Response Wrapper

 
Greenhorn
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I have read the Servlet 2.4 spec.
Seems not cover much about that.
Any materials about this?
What kinds of question will be asked on this?
Quentin
 
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Can anyone throw some light on Request and Response Wrappers and a comparison between Wrapper and Filter as mentioned in the Exam Objective 3.3?

create a request or response wrapper; and given a design problem, describe how to apply a filter or a wrapper
 
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