Cookie,
        FastAPI,
        WebSocket,
        WebSocketException,
        status,
    )

    app = FastAPI()

    @app.websocket("/items/{item_id}/ws")
    async def websocket_endpoint(
        *,
        websocket: WebSocket,
        session: Annotated[str | None, Cookie()] = None,
        item_id: str,
    ):
        if session is None:

        ```python
        from fastapi import APIRouter, FastAPI, WebSocket

        app = FastAPI()
        router = APIRouter()

        @router.websocket("/ws")
        async def websocket_endpoint(websocket: WebSocket):
            await websocket.accept()
            while True:
                data = await websocket.receive_text()
                await websocket.send_text(f"Message text was: {data}")

        **Example**

        ```python
        from fastapi import FastAPI, WebSocket

        app = FastAPI()

        @app.websocket("/ws")
        async def websocket_endpoint(websocket: WebSocket):
            await websocket.accept()
            while True:
                data = await websocket.receive_text()
                await websocket.send_text(f"Message text was: {data}")

///

## 🌅 ℹ

💡 🌅 🔃 🎛, ✅ 💃 🧾:

* <a href="https://www.starlette.io/websockets/" class="external-link" target="_blank"> `WebSocket` 🎓</a>.

* <a href="https://www.starlette.io/websockets/" class="external-link" target="_blank">Die `WebSocket`-Klasse</a>.

* <a href="https://www.starlette.io/websockets/" class="external-link" target="_blank">A classe `WebSocket`</a>.

///

## 更多信息

要了解更多选项，请查看 Starlette 的文档：

* [WebSocket 类](https://www.starlette.io/websockets/)

* <a href="https://www.starlette.io/websockets/" class="external-link" target="_blank">The `WebSocket` class</a>.

## その他のドキュメント

オプションの詳細については、Starletteのドキュメントを確認してください。

* <a href="https://www.starlette.io/websockets/" class="external-link" target="_blank"> `WebSocket` クラス</a>