# SyncProtocolTransport

> **Class** in `langgraph_sdk`

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

Protocol implemented by sync SSE and WebSocket transports.

## Signature

```python
SyncProtocolTransport()
```

## Extends

- `Protocol`

## Properties

- `thread_id`

## Methods

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

---

[View source on GitHub](https://github.com/langchain-ai/langgraph/blob/916025d2f6d9f6ddb2628bd248bc4f3db632d9a8/libs/sdk-py/langgraph_sdk/stream/transport/base.py#L45)