Hi Mircea,
thanks for your help. Meanwhile I found several issue in my configuration (OpenXCAP and clients) which I have solved now.
The download of resource-list.xml is now done with: GET http://xcap.net1.test/resource-lists/users/bob/resource-list.xml and that works perfect.
He experiences should be documented and the idea of Adrian to setup a read/write page for OpenXCAP deployment experiences will be helpful for many others.
Regards -franz