Je n'arrive aps a faire le tuto django channels

# chat/consumers.py
import json

from asgiref.sync import async_to_sync
from channels.generic.websocket import WebsocketConsumer


class ChatConsumer(WebsocketConsumer):
    def connect(self):
        print("ChatConsumer.connect")
        self.room_name = self.scope["url_route"]["kwargs"]["room_name"]
        self.room_group_name = "chat_%s" % self.room_name

        # Join room group
        async_to_sync(self.channel_layer.group_add)(
            self.room_group_name, self.channel_name
        )

        self.accept()

    def disconnect(self, close_code):
        print("ChatConsumer.disconnect")
        # Leave room group
        async_to_sync(self.channel_layer.group_discard)(
            self.room_group_name, self.channel_name
        )

    # Receive message from WebSocket
    def receive(self, text_data):
        print("ChatConsumer.receive")
        text_data_json = json.loads(text_data)
        message = text_data_json["message"]

        # Send message to room group
        async_to_sync(self.channel_layer.group_send)(
            self.room_group_name, {"type": "chat_message", "message": message}
        )

    # Receive message from room group
    def chat_message(self, event):
        print("ChatConsumer.chat_message")
        message = event["message"]

        # Send message to WebSocket
        self.send(text_data=json.dumps({"message": message}))

# chat/routing.py
from django.urls import re_path

from .consumers import ChatConsumer

websocket_urlpatterns = [
    re_path(r'ws/chat/(?P<room_name>\w+)/$', ChatConsumer.as_asgi(), name='chat'),
]

"""
ASGI config for project_config project.

It exposes the ASGI callable as a module-level variable named ``application``.

For more information on this file, see
https://docs.djangoproject.com/en/5.0/howto/deployment/asgi/
"""
import os

from channels.auth import AuthMiddlewareStack
from channels.routing import ProtocolTypeRouter, URLRouter
from channels.security.websocket import AllowedHostsOriginValidator
from django.core.asgi import get_asgi_application


from chat.routing import websocket_urlpatterns

os.environ.setdefault('DJANGO_SETTINGS_MODULE', 'mysite.settings')
# Initialize Django ASGI application early to ensure the AppRegistry
# is populated before importing code that may import ORM models.
django_asgi_app = get_asgi_application()

application = ProtocolTypeRouter({
    "http": django_asgi_app,
    # Just HTTP for now. (We can add other protocols later.)

    "websocket": AllowedHostsOriginValidator(
        AuthMiddlewareStack(URLRouter(websocket_urlpatterns))
    ),
})

[17/Dec/2023 12:33:38] "GET /chat/lobby/ HTTP/1.1" 200 1660
Not Found: /favicon.ico
Not Found: /ws/chat/lobby/
[17/Dec/2023 12:33:38,771] - Broken pipe from ('127.0.0.1', 64331)
[17/Dec/2023 12:33:38] "GET /ws/chat/lobby/ HTTP/1.1" 404 2232