Method on_stream_chunk

examples/server/server.py:15578–15579

(chunk: CompletionChunk)

        error_box: Dict[str, BaseException] = {}

        def on_stream_chunk(chunk: CompletionChunk) -> None:
            mailbox.put(chunk)

        def on_done(result: OpenAICompletion) -> None:
            result_box["result"] = result