django-channels 2.0 websocket connection problem (error 500)

[Alberto Buratti]

Hello,

I've just installed django-channels 2 and followed the installation instructions. I've got this error while trying to connect a websocket to my application:

Browser console:

websocketbridge.js:118 WebSocket connection to 'ws://127.0.0.1:8000/userlocation/' failed: Error during WebSocket handshake: Unexpected response code: 500

Django runserver:

[2018/02/05 18:12:56] WebSocket HANDSHAKING /userlocation/ [127.0.0.1:36137]
[2018/02/05 18:12:57] WebSocket DISCONNECT /userlocation/ [127.0.0.1:36137]

I cannot make the output more verbose (already running with -v 3).

consumers.py

from channels.generic.websocket import JsonWebsocketConsumer


class UserLocationConsumer(JsonWebsocketConsumer):
    def receive_json(self, content, **kwargs):
        print(content)

routing.py

from django.urls import path
from channels.routing import ProtocolTypeRouter, URLRouter
from channels.auth import AuthMiddlewareStack
from mobile.consumers import UserLocationConsumer

application = ProtocolTypeRouter({
    "websocket": AuthMiddlewareStack(
        URLRouter([
            path('userlocation/', UserLocationConsumer),
        ]))
    ,
})

Running on ubuntu 16.04 with python 3.5.2, Django 2.0.2

Am I missing something?

[Andrew Godwin]

Have you upgraded to the most recent version of Daphne? There was a bug where tracebacks weren't printing sometimes that I fixed over the weekend.

Andrew

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