Apache (HTTPD) integration

Hi,

I'm in the process of integration slide as WebDAV-Layer in our 
application. So far it works fine. Now I want to use our Apache 
Web-Server as the http-Server.

The problem is that when I use an URL like:

http://demo.localhost.de/kos/webdav/

in the Windows XP WebDav-Client I should authenticate the folder.

But when I am using the Tomcat via

http://demo.localhost.de:8080/kos/webdav/

it works fine.

The thing is: for ease of development I don't use any authentication 
method yet. And: If I use the Apache-URL in an Webbrowser I can browse 
the WebDAV-Folder.

What am I missing? Do I have to activate a WebDAV-Module in Apache or 
something like that?

With regards
Tino

P.S: Tomcat is connected via JK1.2 (AJP) to the Apache-Server.