Implement last-resort error handler for HTTP requests
Implement last-resort error handler for HTTP requests

There's no WSGI server to do this for us, so Channels has to.

Coread/channels,Coread/channels,raiderrobert/channels,andrewgodwin/django-channels,linuxlewis/channels,django/channels,Krukov/channels,Krukov/channels,raphael-boucher/channels,andrewgodwin/channels