Starting the daphne service, the main thread is locked.

Using Django Async/Channels
1

Python 3.11 + Django 4.2.17 + asgiref 3.8.1 + daphne 4.1.2

Command:
daphne health_inspect.asgi:application --bind 127.0.0.1 --port 8002 --application_close_timeout 10

Using Daphne as the server, run the following command to start the service:
daphne -t 30 --application_close_timeout 10 health_inspect.asgi:application --bind 127.0.0.1 --port 8002.

When making API calls, the message “took too long to shut down and was killed” appears, executing async_to_sync afterward will cause the service to hang.

By reading the source code, it was found that the execution of the function daphne.server.Server.application_checker is the direct cause of the main thread being locked.

mport asyncio
from asgiref.sync import async_to_sync


async def wait():
    await asyncio.sleep(1)


def get_publickey(request):
    time.sleep(50) 
    async_to_sync(wait)()


    return HttpResponse(json.dumps({}))

The above is an example of the interface code. May I ask, is it due to the way I use Daphne, or is it a bug in Daphne?