DAV doesn't work with a Linux client (can't create files)

DAV knows how to create a folder, but not a file when used from a Linux client.

Here the transcript of a session:

darkstar# mount.davfs http://localhost:8080/nuxeo/site/dav /mnt/dav
Please enter the username to authenticate with server
http://localhost:8080/nuxeo/site/dav or hit enter for none.
Username: Administrator
Please enter the password to authenticate user Administrator with server
http://localhost:8080/nuxeo/site/dav or hit enter for none.
Password:
darkstar# cd /mnt/dav
darkstar# ls
Administrator john lost+found test
darkstar# cd Administrator
darkstar# ls
darkstar# touch titi
touch: setting times of `titi': No such file or directory
darkstar# cat > titi
zsh: invalid argument: titi
darkstar# mkdir titi
darkstar# cp /root/debug.log .
cp: cannot create regular file `./debug.log': Invalid argument
darkstar#