Filtering and modification of Response in Tapestry

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Dear all,

I'm struggling on how to filter and modify the response sent to the client
in a Tapestry web application.
I tried first with a RequestFilter contributed to the RequestHandler
service.
The problem occurred when I tried to read the content of the current
response out stream. There are different hints on the internet how to do a
"capture" of this output stream using a custom HttpServletResponseWrapper
and overwriting the write method of the ServletOutputStream, to get the
current content of the outputstream as byte array.

But this is always empty, regardless of how I try to do it.

Can you tell me, what is the right way in Tapestry to do it? Which service
do I have to contribute, in which phase of the request processing the
response is filled and can be read, BEFORE it is send to the client?

Thanks a lot for your suggestions, I really appreciate them!

Best Regards, Ric

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