Routing

You need to define a URL to route connections to the ChatConsumer consumer you have implemented. Channels provides routing classes that allow you to combine and stack consumers to dispatch based on what the connection is. You can think of them as the URL routing system of Django for asynchronous applications.

Create a new file inside the chat application directory and name it routing.py. Add the following code to it:

from django.urls import re_path
from . import consumers
websocket_urlpatterns = [
    re_path(r'ws/chat/room/(?P<course_id>\d+)/$', 
            consumers.ChatConsumer.as_asgi()),
]

In this code, you map a URL pattern with the ChatConsumer class that you defined in the chat/consumers.py file. You use Django’s re_path to define the path with regular expressions. You use the re_path function instead of the common path function because of the limitations of Channels’ URL routing. The URL includes an integer parameter called...