[Django]-Cannot import ASGI_APPLICATION module while runserver using channels 2

In my case it was wrong import in different file.

What you should do is

python manage.py shell
from mysite.routing import application

Look what exact error it produces and try to fix that

Just change

ASGI_APPLICATION = mysite.routing.application

to

ASGI_APPLICATION = “routing.application”

Check for any potential errors (maybe import error) in consumers.py.
Also, try to put channels as the first item in INSTALLED_APPS in settings.py.

As stated in channels document:

The Channels development server will conflict with any other third-party apps that require an overloaded or replacement runserver command. An example of such a conflict is with whitenoise.runserver_nostatic from whitenoise. In order to solve such issues, try moving channels to the top of your INSTALLED_APPS or remove the offending app altogether.

This helped me:
Everything with ASGI_APPLICATION was fine (thanks to all the previous answers given here). But I read logs a bit further and it appeared, there was an import error somewhere else:

ImportError: cannot import name 'channel_session_user_from_http' from 'channels.auth'

Once I got rid of it, everything came back on track.

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

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),
]

Django 2.2 doesn’t have inbuilt ASGI support so we need to use Channel’s fallback alternative. Create myproject/asgi.py like this:

import os

import django
from channels.http import AsgiHandler
from channels.routing import ProtocolTypeRouter

os.environ.setdefault('DJANGO_SETTINGS_MODULE', 'mysite.settings')
django.setup()

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

source: Channels Docs.

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

I am also facing the same problem.
Make sure:
=> The routing.py file should be inside the project root folder(i.e. django server, one that has settings.py, wsgi.py,..)
=> In settings.py include, ASGI_APPLICATION = “yourprojectrootname.routing.application”

=>Sometimes, the coding inside routing.py file may generate this error, to check if this is the case remove all the coding and enter the general template coding,

from channels.routing import ProtocolTypeRouter

application = ProtocolTypeRouter({
    # Empty for now (http->django views is added by default)
})

then run the ‘python manage.py runserver’. This time if you didn’t get any error then problem lies in coding inside routing.py. Debug and fix the issue.

=>In other cases this may be of version problem, downgrading to channels==2.1.2 works

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)

I have written the below code in asgi.py file, websocket_urlpatterns is imported from routing.py file. This is worked for me.

import os

from django.core.asgi import get_asgi_application

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


os.environ.setdefault('DJANGO_SETTINGS_MODULE', 'myApp.settings')



application = ProtocolTypeRouter({
    'http': get_asgi_application(),
    'websocket': AuthMiddlewareStack(URLRouter(websocket_urlpatterns))
})

try

python3 manage.py shell
>>> from your_project import asgi

if you see below

Traceback (most recent call last):
  File "<console>", line 1, in <module>
  File "/your_project/asgi.py", line 14, in <module>
    from django.core.asgi import get_asgi_application
ModuleNotFoundError: No module named 'django.core.asgi'

your django version is lower than 3.x. asgi is supported after 3.x

found it from here

Django application: No module named 'django.core.asgi'

I was also having the same issue i did everything to resolve it, creating another virtual environment and installing older version of Django but after 2 days of hardware i came to realize that my consumers.py file was missing with just a ‘s’ in consumer’s’ and after that i also corrected in my routing.py file. May be this could be your problem also please do check all the file names first.

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

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.

This problem is course by not importing the get_asgi_application in asgi.py file in settings.py actually had the same issue when i was trying to deploy my app but was able to resolve it by importting get_asgi_application and using it as a traditional http request fallback like so in the asgi.py file :

mport 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 django.urls import path

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()

from chat.consumers import AdminChatConsumer, PublicChatConsumer

application = ProtocolTypeRouter({
    # Django's ASGI application to handle traditional HTTP requests
    "http": django_asgi_app,

    # WebSocket chat handler
    "websocket": AllowedHostsOriginValidator(
        AuthMiddlewareStack(
            URLRouter([
                path("chat/admin/", AdminChatConsumer.as_asgi()),
                path("chat/", PublicChatConsumer.as_asgi()),
            ])
        )
    ),
})

I solved my problem by:

• python manage.py migrate
• python manage.py makemigrations
• python manage.py migrate

Also check if you have put the routing.py file in the wrong directory. It should be ‘myproject/routing.py’

Changing define ASGI_APPLICATION variable and CHANNEL_LAYERS.default.ROUTING variable
from

<project_name>.routing.application

to

routing.application

With this, I can run properly

Django Version problem

None of the above and other stack overflow answers caused a problem to me I tried the full code from documentation using Django version 3 but without no help and the error still appearing every-time

Solving

solved by downgrading Django version from version 3 to 2.2 and followed the instruction of the 2.2 version (notes section) in the documentation

https://channels.readthedocs.io/en/stable/tutorial/part_1.html