=htp mark Http.ServerBinding `sealed`
=htc small improvements in `DateTime`
=str apply temporary work-around for #16571
!htc clean up and unify HTTP exception model
=htc small refactoring in OneHundredContinue support
=htc refactor HttpClient stream setup, closes #16510
=htc small improvement in BodyPartParser
=htc #16574 fix large requests not being consumable on the server-side
=htc make server accept early incoming request stream close

This is the fix for #16510 on the server-side.
=htc add one more test checking against #16574
Merge pull request #16580 from spray/wip-16574-mathias

=htc #16574 fix large requests not being consumable on the server-side