How to setup ASGI CORS in Django?

[Saugatkafley]

I was unable to setup CORS in asgi application . I saw all the instructions but unable to understand where to place them . It didn't work in the base.py .

[simonw]

What did you try?

Generally I wouldn't suggest using this with Django since Django already has very robust CSRF protection built into the core framework itself: https://docs.djangoproject.com/en/4.1/ref/csrf/

[Saugatkafley]

Is there a way to implement using ours in django?

[moritz89]

A reason is if Django is used with Strawberry GraphQL which provides a parallel view. This has the effect that Django's middleware is not run for all paths (e.g., /graphql/).

One option to integrate it is (abbreviated from my implementation):

# asgi.py

from django.conf import settings
from django.core.asgi import get_asgi_application
from django.urls import re_path
from strawberry.channels import GraphQLHTTPConsumer

# Import middlewares and the Strawberry schema after creating the django ASGI application.
# This ensures django.setup() has been called before any ORM models are imported

from myapp.graphql.schema import schema

django_asgi_app = get_asgi_application()
gql_http_consumer = GraphQLHTTPConsumer.as_asgi(schema=schema)

application = ProtocolTypeRouter(
    {
        "http": URLRouter(
            [
                re_path("^graphql/", gql_http_consumer),
                re_path("^", django_asgi_app),
            ]
        )
    }
)


def SecurityStack(app):
    """CORS and AllowedHost Checks."""

    return asgi_cors(
        app,
        hosts=["https://app.example.com"],
        methods=["POST"],
        headers=["Content-Type, Authorization"],
        max_age=86400,
    )


application = SecurityStack(application)

And then you start the ASGI server with: daphne myapp.asgi:application

[moritz89]

After further research I'd suggest using CORSMiddleware from Starlette. The behavior of this library does not conform to the spec in a few scenarios and that one will and can integrated into asgi Django in a similar manner as stated above.