def get_manifest_and_response(self, alias):
        """
        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>`_
        """
        r = self._request('get',
                          'manifests/' + alias,
                          headers={'Accept': _schema2_mimetype + ', ' +
                                             _schema1_mimetype})
        return r.content.decode('utf-8'), r
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>`_