[quicwg/base-drafts] Transition to half closed local should probably happen on FIN ack (#571)

[Subodh Iyengar <[e-mail]>]

in 10.2.2. 
" An endpoint sending an FIN flag causes the stream state to become “half-closed (local)”. An endpoint receiving a FIN flag causes the stream state to become “half-closed (remote)” once all preceding data has arrived"

this seems to suggest that a sender will transition to half closed immediately after sending a FIN. Is that intentional? 

It seems that it would be better for the sender to transition to FIN only after getting the ACK otherwise you'd get into a case where:

Sender sends FIN -> transitions to half closed local
Receiver races with a RST -> sender has sent the FIN, so doesn't send a RST stream is response
Sender transitions to closed
FIN gets lost

However now that the sender is in closed it might still have to retransmit the FIN. Making the sender wait on FIN ack to transition to half closed local seems better, that way if the FIN is not ACKed, the sender could just go into half closed remote like normal when it gets the RST.

I like the idea of closed state being a terminal state where no additional work is needed from the sender.


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