code: def get_manifest_and_response(self, alias):
          
          r = self._request('get',
                            'manifests/' + alias,
                            headers={'Accept': _schema2_mimetype + ', ' +
                                               _schema1_mimetype})
          return r.content.decode('utf-8'), r
docs: Request the manifest for an alias and return the manifest and the
          response.
  
          :param alias: Alias name.
          :type alias: str
  
          :rtype: tuple
          :returns: Tuple containing the manifest as a string (JSON) and the `requests.Response <http://docs.python-requests.org/en/master/api/#requests.Response>`_