I think that's a good philosophy. unfortunately, if I read the only developer doc I can find on Apache filters http://httpd.apache.org/docs/2.0/developer/filters.html I don't see any rules about what to do when your filter changes the length of the body.
We've only said it a hundred times on [EMAIL PROTECTED] =) An output filters is always supposed to clear the appropriate metadata whenever it alters the body. -- justin