After upgrade to 3.7.11 from 3.7.10 WebSockets start failing.
Django==2.1.2
djangorestframework==3.8.2
daphne==2.3.0
channels==2.3.1

From the 3.7.11 changelog:
Following the controlling specification for URLs defined by WHATWG urllib.parse() now removes ASCII newlines and tabs from URLs, preventing such attacks.

Probably something is not good here now.


2021-07-07T10:11:23.439030174Z2021-07-07 10:11:23,438 ERROR [Failure instance: Traceback: <class 'AttributeError'>: 'NoneType' object has no attribute 'replace'
Error
2021-07-07T10:11:23.439074685Z/root/.local/share/virtualenvs/app-4PlAip0Q/lib/python3.7/site-packages/autobahn/websocket/protocol.py:2841:processHandshake
Error
2021-07-07T10:11:23.439091149Z/root/.local/share/virtualenvs/app-4PlAip0Q/lib/python3.7/site-packages/txaio/tx.py:366:as_future
Error
2021-07-07T10:11:23.439097914Z/root/.local/share/virtualenvs/app-4PlAip0Q/lib/python3.7/site-packages/twisted/internet/defer.py:167:maybeDeferred
Error
2021-07-07T10:11:23.439118640Z/root/.local/share/virtualenvs/app-4PlAip0Q/lib/python3.7/site-packages/daphne/ws_protocol.py:82:onConnect
Error
2021-07-07T10:11:23.439122445Z--- <exception caught here> ---
Error
2021-07-07T10:11:23.439125845Z/root/.local/share/virtualenvs/app-4PlAip0Q/lib/python3.7/site-packages/twisted/internet/defer.py:167:maybeDeferred
Error
2021-07-07T10:11:23.439129088Z/root/.local/share/virtualenvs/app-4PlAip0Q/lib/python3.7/site-packages/daphne/server.py:200:create_application
Error
2021-07-07T10:11:23.439132308Z/root/.local/share/virtualenvs/app-4PlAip0Q/lib/python3.7/site-packages/channels/routing.py:58:__call__
Error
2021-07-07T10:11:23.439135496Z/root/.local/share/virtualenvs/app-4PlAip0Q/lib/python3.7/site-packages/channels/security/websocket.py:35:__call__
Error
2021-07-07T10:11:23.439138809Z/root/.local/share/virtualenvs/app-4PlAip0Q/lib/python3.7/site-packages/channels/security/websocket.py:53:valid_origin

Can you provide a short code example that reproduces this, preferably without using any third party libraries?

It will be not easy as I'll need to create some sandbox for you. The current code version is not available for sharing.


But ok. For example here is a routing.py file:

from django.conf.urls import url
from channels.routing import ProtocolTypeRouter, URLRouter
from channels.security.websocket import AllowedHostsOriginValidator
from channels.auth import AuthMiddlewareStack
from some_dir import MyConsumer

application = ProtocolTypeRouter({
    'websocket': AllowedHostsOriginValidator(
        AuthMiddlewareStack(
            URLRouter([
                url('api/socket/end-point-1', MyConsumer),
            ])
        )
    )
})

Let me know if you need more information

That excerpt is not executable by itself.  Without a reproducible test case and better traceback info, there is not enough information here to investigate further.

Python 3,7 is no longer maintained. Please create a new issue if you see this on a current version (>= 3.9) and are able to provide more information.