Julian, thanks for your answers. I might have written my answer in an unclear way but I interpret "Absolute paths are fine." as absolute URLs like http://myvirtualhost.example.org/dav/wsp/mynode should be used in the content of a response. This means that the scheme and the host need to be correct. IPs in the URL are not really an option. If scheme and host are relevant, how can I inject them into the repository behind a reverse proxy that uses virtual hosts?
Marc
