Problem with FilterProvider directive

["Dennis J." <de...@conversis.de>]

Hi,
I wrote a small output filter that is supposed to add a small footer to all 
files with the content-type text/html. I defined the filter in the 
following way:

FilterProvider myfooter MYFOOTER resp=Content-Type $text/html
FilterProtocol myfooter change=yes
FilterChain myfooter

My problem is that the output filter function is called no matter what the 
content-type is. When I output the filter->request_rec->content_type field 
in the output filter function I can see that it gets called for png's and 
css files too. Isn't the "resp=Content-Type $text/html" bit supposed to 
only invoke the filter for text/html content?

Regards,
   Dennis