我想要连接websockets，但启动时出现错误。
uvicorn app:app --reload --ws websockets
要求
操作系统：Linux Ubuntu 20.04 LTS
Python 3.8.6
浏览器：Chrome 88.0.4324.182
快速API ==0.63.0
python-engineio ==4.0.0
python-socketio ==5.0.4
星星==0.13.6
独角兽==0.13.3
网络套接字==8.1
应用程序.py
from typing import Optional
import socketio
from fastapi import FastAPI, Query, WebSocket
sio = socketio.AsyncServer(
async_mode="asgi", cors_allowed_origins="*", logger=True, engineio_logger=True
)
app = FastAPI(debug=True)
app_socketio = socketio.ASGIApp(sio)
app.mount(path="/", app=app_socketio)
@app.websocket("/items/{item_id}/ws")
async def websocket_endpoint(
websocket: WebSocket,
item_id: str,
q: Optional[int] = None,
):
# pylint: disable=C0103,W0613
await websocket.accept()
while True: …