Hi,

I've run into a rather obscure, nonetheless important problem.  I have a
filter that wraps the response object into a custom wrapper class designed
to collect JSP's output into a StringWriter.  Once the call to the filter
chain returns, I process (modify) the output collected in the StringWriter
and return it to the client via a call to getWriter().write(...) on the
original response object.  The problem is that all of the responses
generated in this fashion lack both Content-length and Transfer-encoding:
chunked headers.   Since the protocol used is most often HTTP/1.1 with
keep-alive enabled, without either of these headers present a client
doesn't know when to stop receiving data.  This results in a progress bar
lingering around the status field of the browser long after the page is
rendered.

I've tried setting the content-length header manually from the filter, but
that doesn't work because even if I call setContentLength right after
doFilter(), the response appears to be already committed and the call has
no effect.  I don't know what else I can try.  Any ideas?

Thanks
Dmitry

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