Django Channel第一步失误

Question

我正在关注Channels文档的入门教程，但是当我启动runserver并尝试加载任何页面时，它会给我这个错误：

16:17:46 [django.request] ERROR Internal Server Error: /
Traceback (most recent call last):
  File "C:\web\wr-kpi-dashboard\.venv\lib\site-packages\django\core\handlers\base.py", line 235, in get_response
    response = middleware_method(request, response)
  File "C:\web\wr-kpi-dashboard\.venv\lib\site-packages\wr_security\middleware\log_access.py", line 39, in process_response
   'protocol': request.META['SERVER_PROTOCOL'],
KeyError: 'SERVER_PROTOCOL'
[2017/09/06 16:17:47] HTTP GET / 500 [0.63, 127.0.0.1:60297]

settings.py

CHANNEL_LAYERS = {
    "default": {
        "BACKEND": "asgiref.inmemory.ChannelLayer",
        "ROUTING": "dashboard.channels.routing.channel_routing",
    },
}

routing.py

from channels.routing import route
from consumers import ws_message
channel_routing = [
    route("websocket.receive", ws_message),
]

consumers.py

def ws_message(message):
    # ASGI WebSocket packet-received and send-packet message types
    # both have a "text" key for their textual data.
    message.reply_channel.send({
        "text": message.content['text'],
    })