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"Filters may be used to create request or response wrappers"

 
Himai Minh
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According to p. 735 of Head First,

Which about filters are true?
A. Filters may be used to create request or response wrappers.
...

From the examples of the book, I think it is the developer who creates a wrapper for the request/response and pass the wrapper object to the filter chain's doFilter method, like the example on p.720:

The filter itself does not create the wrapper.
 
Frits Walraven
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The filter itself does not create the wrapper.

True, but that is not how I interpret that sentence. I interpreted it like this: if you want to work with request or response wrappers then a filter is a appropriate place to create them.
 
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