r DELETE request whose pre-condition
             fails (see &#34;Versioning&#34; below),
       * 507 in case the account is over its storage quota,
       * 4xx for all malformed requests (e.g. foreign characters in the
             path), as well as for all PUT and DELETE requests to
             folders,
       * 2xx for all successful requests.

    Clients SHOULD also handle the case where a response takes too long
    to arrive, or where no response is received at all.

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