Cannot import ASGI_APPLICATION module while runserver using channels 2

Question

I have followed the channels tutorial but while running these error throw

Version of the packages is channels==2.1.2 Django==2.0.4<

Answer 1

I've recently faced to this problem, and quickly solved it. After checking the configurations in settings.py and routing.py, I found the problem is in this line:

from channels.auth import AuthMiddlewareStack

the problem is the version compatibility. Then, I upgraded the requirements.txt to the below and it works quiet well.

channels==2.4.0
channels-redis==2.4.2
daphne==2.5.0

Answer 2

You need to put your routing.py file inside mayapp/mayapp/routing.py instead of mayapp/routing.py

Answer 3

in my case there were unresolved packages in consumer.py check if you have any unresolved packages in your channels .py files

Answer 4

You should put routing.py inside mysite/mysite/ not mysite/ otherwise you won't be able to use ASGI_APPLICATION = mysite.routing.application in the settings file and you get that error.

Answer 5

In case anybody comes along this. Remember: ASGI_APPLICATION = "myapp.routing.application" should go at the bottom of settings.py to ensure nothing get snagged in production!

mysite/myapp/routing.py

from channels.auth import AuthMiddlewareStack
from channels.routing import ProtocolTypeRouter, URLRouter
import myapp.routing

application = ProtocolTypeRouter({
    # (http->django views is added by default)
    'websocket': AuthMiddlewareStack(
        URLRouter(
            myapp.routing.websocket_urlpatterns
        )
    ),
})

myapp/routing.py

from django.urls import path
from . import consumers

websocket_urlpatterns = [
    path('chatroompage', consumers.ChatConsumer),
]

Answer 6

When importing your app with absolute path in myapp/routing make sure it is imported like:

import myapp.routing

from channels.auth import AuthMiddlewareStack
from channels.routing import ProtocolTypeRouter, URLRouter
import myapp.routing

application = ProtocolTypeRouter({
    # (http->django views is added by default)
    'websocket': AuthMiddlewareStack(
        URLRouter(
            myapp.routing.websocket_urlpatterns
        )
    ),
})

It may give you warning as error in PyCharm but you will have working Django channels. I reported it as bug to PyCharm. I hope no one else will spend 3-4 hours on it like me)