Channels

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* HTTP request body size limit is now enforced

* database_sync_to_async now closes old connections before it runs code

* Auth middleware closes old connections before it runs

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* HttpCommunicator now extracts query strings correctly

* AsyncHttpConsumer provides channel layer attributes

* Prevent late-Daphne import errors

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* Django middleware caching now works on Django 1.11 and Django 2.0.
The previous release only ran on 2.1.

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* Django middleware is now cached rather than instantiated per request
resulting in a significant speed improvement

* ChannelServerLiveTestCase now serves static files again

* Improved error message resulting from bad Origin headers

* runserver logging now goes through the Django logging framework

* Generic consumers can now have non-default channel layers

* Improved error when accessing scope['user'] before it's ready

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* An ALLOWED_ORIGINS value of "*" will now also allow requests without a Host
header at all (especially important for tests)

* The request.path value is now correct in cases when a server has SCRIPT_NAME
set

* Errors that happen inside channel listeners inside a runworker or Worker
class are now raised rather than suppressed

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* AsyncHttpConsumer now has a disconnect() method you can override

* Session and authentication middleware is now non-blocking.

* URL routing context now includes default arguments from the URLconf.

* The FORCE_SCRIPT_NAME setting is now respected in ASGI mode.

* ALLOWED_HOSTS is now set correctly during LiveServerTests.