deletion of that document from the storage, and from its
         parent folder,
       * silent deletion of the parent folder if it is left empty by
         this, and so on for further ancestor folders,
       * the version of its parent folder being updated, as well as that
         of further ancestor folders.

    A successful OPTIONS request SHOULD be responded to as described in
    the CORS section below.

    A successful HEAD request SHOULD be responded to like to the
    equivalent GET request, b