Handle IIS OnCompleted callbacks later #17756
Merged
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#17268 IIS doesn't unblock the end of a response until PostCompletion is called. I've refactored here so that PostCompletion gets called after all things that modify the response but before the OnCompleted callbacks get fired.
I couldn't see how to write an automated test for this since OnCompleted is intentionally not supposed to have observable side-effects on the client.