Content-Encoding never matches ->bug in mod_filter?

[Samuel Vogel <samy-delux@xxxxxx>]

While playing around with mod_filter i tried to do the following to add 
a filter to every page that is not gzipped:

FilterProvider addcomment LAYOUT resp=Content-Encoding !$gzip

But that did never apply the filter. On the other hand, applying by 
Content-Type works perfectly well:

FilterProvider addcomment LAYOUT resp=Content-Type $text/html

So I tried something else:

FilterProvider addcomment LAYOUT resp=Content-Encoding !$blub

In my opinion this should always match, since "blub" will never be 
present in the Content-Encoding header.
Am I doing something wrong, or should I file a bug report ?

Regards,
Samy

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