def auth_flow(self, request: httpx.Request) -> Iterator[httpx.Request]:
        """
        The authentication flow that signs the HTTPX request using the OCI signer.

        This method is called by HTTPX to sign each request before it is sent.

        Args:
            request (httpx.Request): The outgoing HTTPX request to be signed.

        Yields:
            httpx.Request: The signed HTTPX request.

        """
        # Create a requests.Request object from the HTTPX request
        req = requests.Request(
            method=request.method,
            url=str(request.url),
            headers=dict(request.headers),
            data=request.content,
        )
        prepared_request = req.prepare()

        # Sign the request using the OCI Signer
        self.signer.do_request_sign(prepared_request)

        # Update the original HTTPX request with the signed headers
        request.headers.update(prepared_request.headers)

        # Proceed with the request
        yield request

        The authentication flow that signs the HTTPX request using the OCI signer.

        This method is called by HTTPX to sign each request before it is sent.

        Args:
            request (httpx.Request): The outgoing HTTPX request to be signed.

        Yields:
            httpx.Request: The signed HTTPX request.

        
llama-index-integrations/embeddings/llama-index-embeddings-oci-data-science/llama_index/embeddings/oci_data_science/client.py