manipulating page content

[Rob Brown]

Hi,

I just signed up for the list because I am considering using Varnish for an
upcoming project. I'm not very familiar with it's capabilities yet, and
haven't been able to quickly find an answer to a specific question I have:

Is it possible for Varnish to "manipulate" the pages that it serves out of
cache "on the way out" (post-cache)?
More specifically: I have an app that generates pages with a session key in
them that I need to strip out to make cacheable, but then put back in based
on a session key parameter sent in the query string.

If this is something Varnish can do, i'd like to know before getting to far
down the road. Comments welcome.
Thanks.
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