Tolerate the request stream being started after .finished #577
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Motivation
The RequestBag intermediates between two different threads. This means
it can get requests that were reasonable when they were made but have
been superseded with newer information since then. These generally have
to be tolerated.
Unfortunately if we received a request to resume the request body stream
after the need for that stream has been invalidated, we could hit a
crash. That's unnecessary, and we should tolerate it better.
Modifications
Tolerated receiving requests to resume body streaming in the finished
state.
Result
Fewer crashes
Fixes #576