-        # Authorizing manually since GitHub does not response with 401 with
-        # WWW-Authenticate header set (see
-        # https://developer.github.com/v3/#basic-authentication)
-        b64 = base64.b64encode(
-            ('%s:%s' % (self._username, self._password)).encode('utf-8')).decode('ascii')
-        req.add_header('Authorization', 'Basic %s' % b64)