def client(self) -> httpx.Client:
        """
        Lazy initialization of the HTTP client.
        """
        if self._http_client is None:
            self._http_client = httpx.Client()
        return self._http_client

        Lazy initialization of the HTTP client.
        
llama-index-integrations/postprocessor/llama-index-postprocessor-nvidia-rerank/llama_index/postprocessor/nvidia_rerank/base.py