check final response in poll_informational#889
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Make sure
poll_informationalreturnsPoll::Ready(None)after the final response received. So the caller can then use theResponseFuture::poll()method to get the final response.The lock in
OpaqueStreamRefget released whenpoll_informationalreturned, so if it didn't returnsPoll::Ready(None)on received final response header, the caller has to callResponseFuture::poll()every time to check the final response, this may get some informational response get ignored.