/etc/davfs2/secrets
"/root/mount/mailru_davfs" "MyUser@mail.ru" "MyPass"
/etc/fstab
https://webdav.cloud.mail.ru /root/mount/mailru_davfs davfs user,rw,_netdev 0 0
mount -a
mount.davfs: Mounting failed.
403 Forbidden
mount.davfs -o rw,username=MyUser@mail.ru https://webdav.cloud.mail.ru /root/mount/mailru_davfs