Support using httpbin without flasgger #109

Job	Run time
unit-tests (3.7, ubuntu-22.04)	59s
unit-tests (3.7, macOS-latest)	5m 47s
unit-tests (3.7, windows-latest)	4m 31s
unit-tests (3.8, ubuntu-22.04)	57s
unit-tests (3.8, macOS-latest)	3m 9s
unit-tests (3.8, windows-latest)	4m 15s
unit-tests (3.9, ubuntu-22.04)	57s
unit-tests (3.9, macOS-latest)	2m 31s
unit-tests (3.9, windows-latest)	4m 16s
unit-tests (3.10, ubuntu-22.04)	44s
unit-tests (3.10, macOS-latest)	3m 1s
unit-tests (3.10, windows-latest)	3m 53s
unit-tests (3.11, ubuntu-22.04)	1m 1s
unit-tests (3.11, macOS-latest)	5m 25s
unit-tests (3.11, windows-latest)	3m 47s
unit-tests (3.12-dev, ubuntu-22.04)	1m 4s
unit-tests (3.12-dev, macOS-latest)	3m 15s
unit-tests (3.12-dev, windows-latest)	3m 28s
unit-tests (pypy-3.8, ubuntu-22.04)	3m 41s
unit-tests (pypy-3.8, macOS-latest)	8m 38s
unit-tests (pypy-3.8, windows-latest)	7m 5s
unit-tests (pypy-3.9, ubuntu-22.04)	3m 48s
unit-tests (pypy-3.9, macOS-latest)	11m 42s
unit-tests (pypy-3.9, windows-latest)	7m 38s
unit-tests (pypy-3.10, ubuntu-22.04)	3m 16s
unit-tests (pypy-3.10, macOS-latest)	12m 26s
unit-tests (pypy-3.10, windows-latest)	7m 6s
publish-docker-image	1m 1s
	1h 59m 21s

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