Add back support for manually handling POST requests #2778

Job	Run time
.NET unit tests (ubuntu-latest)	2m 53s
Build published projects without warnings (Release)	1m 44s
JS unit tests	1m 13s
Build published projects without warnings (Debug)	1m 49s
Build all projects without errors	10m 19s
UI tests (chrome, ubuntu-latest, Production, Default)	12m 45s
.NET unit tests (windows-2022)	8m 7s
UI tests (chrome, windows-2022, Development, Default)	9m 10s
.NET unit tests (macOS-latest)	5m 18s
UI tests (firefox, ubuntu-latest, Development, Default)	18m 27s
UI tests (firefox, ubuntu-latest, Production, Default)	17m 13s
UI tests (firefox, ubuntu-latest, Development, ExperimentalFeaturesTests)	18m 19s
UI tests (chrome, ubuntu-latest, Production, ExperimentalFeaturesTests)	12m 43s
	2h 0m 0s

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