# AsyncProtocolTransport

> **Class** in `langgraph_sdk`

📖 [View in docs](https://reference.langchain.com/python/langgraph-sdk/stream/transport/base/AsyncProtocolTransport)

Protocol implemented by async SSE and WebSocket transports.

## Signature

```python
AsyncProtocolTransport()
```

## Extends

- `Protocol`

## Properties

- `thread_id`

## Methods

- [`send_command()`](https://reference.langchain.com/python/langgraph-sdk/stream/transport/base/AsyncProtocolTransport/send_command)
- [`open_event_stream()`](https://reference.langchain.com/python/langgraph-sdk/stream/transport/base/AsyncProtocolTransport/open_event_stream)
- [`close()`](https://reference.langchain.com/python/langgraph-sdk/stream/transport/base/AsyncProtocolTransport/close)

---

[View source on GitHub](https://github.com/langchain-ai/langgraph/blob/55b0e36c51d2922b11640b980fcfca1064243a96/libs/sdk-py/langgraph_sdk/stream/transport/base.py#L33)