'Return a swift.common.swob.Response class compatible "app_iter"
object. The responsibility of closing the open file is passed to the
DiskFileReader object.
:param keep_cache:'

def reader(self, keep_cache=False):

    dr = DiskFileReader(self._name, self._fp, int(self._metadata['Content-Length']), self._metadata['ETag'])
    self._fp = None
    return dr
