Charset mismatch

Set up:
 - Apache2 running on Windows XP, with mod_dav installed
 - Custom dav client

The client polls the server with HEAD for each element of this URL:
    //dav_dir/business_unit/eastern/clients/Étude Studios

The encoding sends ³Étude² as ³%C9tude². This is valid in Latin 1 through 9
(ISO-8859-1..9).

Apache responds with a 403. I expected 20x or 404.

Using a Windows dav client, which succeeds, the wireshark reports the
encoding as ³%C3%89². I believe this is UTF-8.

In second test, we added Tomcat to the mix and the custom dav client worked
just fine.

Does this sound familiar to anyone?

What are good approaches to resolving this mismatch?

TIA,

 - Mark