def _get_post_headers(self) -> dict:
        """Returns headers that should be attached to each post request."""
        return {
            "x-api-key": self._vectara_api_key,
            "Content-Type": "application/json",
            "X-Source": self._x_source_str,
        }
Returns headers that should be attached to each post request.
llama-index-integrations/indices/llama-index-indices-managed-vectara/llama_index/indices/managed/vectara/base.py