* Headers ``X-Container-Block-*`` at the container level, exposing the underlying storage characteristics.
* All metadata replies, at all levels, include latest modification information.
* At all levels, a ``HEAD`` or ``GET`` request may use ``If-Modified-Since`` and ``If-Unmodified-Since`` headers.
* Headers ``X-Container-Block-*`` at the container level, exposing the underlying storage characteristics.
* All metadata replies, at all levels, include latest modification information.
* At all levels, a ``HEAD`` or ``GET`` request may use ``If-Modified-Since`` and ``If-Unmodified-Since`` headers.