CLIENT & SERVER CANNOT CONNECT# client use sockeito, which EIO=3, server use python-socketio==4.6.1

[qiangziakbar]

from error below, I could tell that client EIO=3,

INFO:     ('127.0.0.1', 47094) - "WebSocket /socket.io/?EIO=3&transport=websocket" 403
INFO:     connection failed (403 Forbidden)
INFO:     connection closed

my server using 4.6.1, server code is like this, why my server doesnt work? it works well in websocket, but I think socketio will be better, but for now, it cannot build connection

import uvicorn
from fastapi import FastAPI
from fastapi.responses import HTMLResponse

import socketio

sio_client = socketio.AsyncClient()

sio_server = socketio.AsyncServer(
    async_mode='asgi',
    cors_allowed_origins="*"
    )
sio_app = socketio.ASGIApp(
    socketio_server = sio_server,
)

app = FastAPI()
app.mount('/ws',app=sio_app)

@sio_server.on("test")
async def my_message(sid, data):
    print('test message is : ', data)
    await sio_server.emit("servermessage",f"test {data}")

@sio_server.on("clientmessage")
async def client_message(sid, data):
    print('clientmessage is : ', data)
    await sio_server.emit("servermessage",f"client sent {data}")

if __name__ == "__main__":
    uvicorn.run("socket_main:app",reload=True,port=8000)

[qiangziakbar]

here is my engineio version

root@VM-12-17-ubuntu:/home/ubuntu# pip show python-engineio
Name: python-engineio
Version: 3.14.2
Summary: Engine.IO server
Home-page: http://github.com/miguelgrinberg/python-engineio/
Author: Miguel Grinberg
Author-email: [email protected]
License: MIT
Location: /usr/local/lib/python3.10/dist-packages
Requires: six
Required-by: python-socketio
root@VM-12-17-ubuntu:/home/ubuntu# 

[miguelgrinberg]

Please see the documentation to learn how to integrate the Socket.IO server with another ASGI app. https://python-socketio.readthedocs.io/en/latest/server.html#uvicorn-daphne-and-other-asgi-servers

[qiangziakbar]

I think I have done it correctly, since my python-client could work well with this server, but my frontend cannot build connections, and I want to know, is this error means a EIO=3 client connection failed?

INFO:     ('127.0.0.1', 47094) - "WebSocket /socket.io/?EIO=3&transport=websocket" 403
INFO:     connection failed (403 Forbidden)
INFO:     connection closed

[miguelgrinberg]

You have not done it correctly. I linked you to the section of the docs that show you to integration Socket.IO with an ASGI app. I do not know what the 403 error means, your FastAPI application is returning that response, not Socket.IO.