Make reading the request body work in Django ASGI apps. #3971

Job	Run time
django, python 3.5, ubuntu-20.04	9m 12s
django, python 3.6, ubuntu-20.04	8m 16s
django, python 2.7, ubuntu-20.04	5m 59s
django, python 3.7, ubuntu-20.04	5m 40s
django, python 3.8, ubuntu-20.04	7m 48s
django, python 3.9, ubuntu-20.04	7m 53s
django, python 3.10, ubuntu-20.04	3m 55s
django, python 3.11, ubuntu-20.04	4m 46s
django, python 3.12, ubuntu-20.04	4m 34s
All django tests passed or skipped	1s
	58m 4s

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