Protocol error, got “H” as reply type byte

I am trying to use django channels for the first time and i am following the tutorial in the documentation. But when I use python manage.py runserver and try to connect i get this error.

Protocol error, got "H" as reply type byte

Here is the whole console(I’m using anaconda):

Quit the server with CTRL-BREAK.
2018-06-20 15:59:25,665 - INFO - server - HTTP/2 support not enabled (install the http2 and tls Twisted extras)
2018-06-20 15:59:25,665 - INFO - server - Configuring endpoint tcp:port=8000:interface=127.0.0.1
2018-06-20 15:59:25,665 - INFO - server - Listening on TCP address 127.0.0.1:8000
[2018/06/20 15:59:36] HTTP GET /chat/lobby/ 200 [0.12, 127.0.0.1:62590]
[2018/06/20 15:59:36] WebSocket HANDSHAKING /ws/chat/lobby/ [127.0.0.1:62594]
2018-06-20 15:59:37,694 - ERROR - server - Exception inside application: Protocol error, got "H" as reply type byte
  File "C:UsersPcAnaconda3envsdjangolibsite-packageschannelssessions.py", line 175, in __call__
    return await self.inner(receive, self.send)
  File "C:UsersPcAnaconda3envsdjangolibsite-packageschannelsmiddleware.py", line 41, in coroutine_call
    await inner_instance(receive, send)
  File "C:UsersPcAnaconda3envsdjangolibsite-packageschannelsconsumer.py", line 54, in __call__
    await await_many_dispatch([receive, self.channel_receive], self.dispatch)
  File "C:UsersPcAnaconda3envsdjangolibsite-packageschannelsutils.py", line 50, in await_many_dispatch
    await dispatch(result)
  File "C:UsersPcAnaconda3envsdjangolibsite-packageschannelsconsumer.py", line 67, in dispatch
    await handler(message)
  File "C:UsersPcAnaconda3envsdjangolibsite-packageschannelsgenericwebsocket.py", line 173, in websocket_connect
    await self.connect()
  File "C:UsersPcDocumentstutorialdjango-channel-tutchatconsumers.py", line 11, in connect
    self.channel_name
  File "C:UsersPcAnaconda3envsdjangolibsite-packageschannels_rediscore.py", line 282, in group_add
    channel,
  File "C:UsersPcAnaconda3envsdjangolibsite-packagesaioredisconnection.py", line 181, in _read_data
    obj = await self._reader.readobj()
  File "C:UsersPcAnaconda3envsdjangolibsite-packagesaioredisstream.py", line 78, in readobj
    obj = self._parser.gets()
  Protocol error, got "H" as reply type byte
[2018/06/20 15:59:37] WebSocket DISCONNECT /ws/chat/lobby/ [127.0.0.1:62594]

On the frontend js return this error

(index):15 WebSocket connection to 'ws://127.0.0.1:8000/ws/chat/lobby/' failed: Error during WebSocket handshake: Unexpected response code: 500
(index):26 Chat socket closed unexpectedly

Here is the whole “pip freeze” list if it he

aioredis==1.1.0
asgiref==2.3.2
astroid==1.6.5
async-timeout==3.0.0
attrs==18.1.0
autobahn==18.6.1
Automat==0.7.0
certifi==2018.4.16
channels==2.1.2
channels-redis==2.2.1
colorama==0.3.9
constantly==15.1.0
daphne==2.2.0
Django==2.0.2
django-cors-headers==2.2.0
djangorestframework==3.8.2
hiredis==0.2.0
hyperlink==18.0.0
idna==2.7
incremental==17.5.0
isort==4.3.4
lazy-object-proxy==1.3.1
mccabe==0.6.1
msgpack==0.5.6
msgpack-python==0.5.6
olefile==0.45.1
Pillow==5.1.0
pylint==1.9.2
pypiwin32==223
pytz==2018.4
pywin32==223
redis==2.10.6
six==1.11.0
Twisted==18.4.0
txaio==2.10.0
wincertstore==0.2
wrapt==1.10.11
zope.interface==4.5.0

Here is the python code: consumer.py

from channels.generic.websocket import AsyncWebsocketConsumer
import json

class ChatConsumer(AsyncWebsocketConsumer):
    async def connect(self):
        self.room_name = self.scope['url_route']['kwargs']['room_name']
        self.room_group_name = 'chat_%s' % self.room_name

        await self.channel_layer.group_add(
            self.room_group_name,
            self.channel_name
        )

        self.accept()

    async def disconnect(self, close_code):
        await self.channel_layer.group_discard(
            self.room_group_name,
            self.channel_name
        )

    async def receive(self, text_data):
        text_data_json = json.loads(text_data)
        message = text_data_json['message']

        await self.channel_layer.group_send(
            self.room_group_name,
            {
                'type': 'chat_message',
                'message': message
            }
        )

    async def chat_message(self, event):
        message = event['message']

        await self.send(text_data=json.dumps({
            'message': message
        }))

routing.py

from django.conf.urls import url

from . import consumers

websocket_urlpatterns = [
    url(r'^ws/chat/(?P<room_name>[^/]+)/$', consumers.ChatConsumer)
]

routing.py in mysite

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

import chat.routing

application = ProtocolTypeRouter({
    # (http->django views is added by default)
    'websocket': AuthMiddlewareStack(
        URLRouter(
            chat.routing.websocket_urlpatterns
        )
    ),
})

part of settings.py

ASGI_APPLICATION = 'mysite.routing.application'
CHANNEL_LAYERS = {
    'default': {
        'BACKEND': 'channels_redis.core.RedisChannelLayer',
        'CONFIG': {
            "hosts": [('127.0.0.1', 8000)],
        },
    },
}

Javascript code

var roomName = {{ room_name_json }};

var chatSocket = new WebSocket(
    'ws://' + window.location.host +
    '/ws/chat/' + roomName + '/');

chatSocket.onmessage = function(e) {
    var data = JSON.parse(e.data);
    var message = data['message'];
    document.querySelector('#chat-log').value += (message + 'n');
};

chatSocket.onclose = function(e) {
    console.error('Chat socket closed unexpectedly');
};

document.querySelector('#chat-message-input').focus();
document.querySelector('#chat-message-input').onkeyup = function(e) {
    if (e.keyCode === 13) {  // enter, return
        document.querySelector('#chat-message-submit').click();
    }
};

document.querySelector('#chat-message-submit').onclick = function(e) {
    var messageInputDom = document.querySelector('#chat-message-input');
    var message = messageInputDom.value;
    chatSocket.send(JSON.stringify({
        'message': message
    }));

    messageInputDom.value = '';
};

Thanks for the help

Answer

Is there any chance you did not have a redis server running on your machine when running your django server? On a mac I did brew install redis and then redis-server and then ran my django server on another terminal window and all worked fine.

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Answer