'Copy current version of object to versions_container before proceeding
with original request.
:param req: original request.
:param versions_cont: container where previous versions of the object
are stored.
:param api_version: api version.
:param account_name: account name.
:param object_name: name of object of original request'

def handle_obj_versions_put(self, req, versions_cont, api_version, account_name, object_name):

    self._copy_current(req, versions_cont, api_version, account_name, object_name)
    return self.app
