Re: [quicwg/base-drafts] Unidirectional Streams (#643)

[Christian Huitema <[e-mail]>]

huitema commented on this pull request.

Looking at this, it seems that the transport advantage is to not require both ends to send FIN or RST for each stream. Of course, if the streams are in practice bilateral, the total number of messages will be exactly the same.

There are some loose ends in the documentation. The text on RST_STREAM needs to be updated, as well as the text of GO_AWAY. Plus, we need something like GO_AWAY_FRAME.

> +                            |        |
+                            |  open  |
+                            |        |
+                            +--------+
+                                 |
+                     receive STREAM with FIN flag
+                        receive RST_STREAM
+                                 |
+                                 v
+                            +--------+
+                            |        |
+                            | closed |
+                            |        |
+                            +--------+
+~~~
+{: #stream-state-recv title="Stream States for Receipt"}
 

This new diagram shows an undocumented change in the meaning of RST_STREAM. In the current version, RST_STREAM is bilateral. "After sending a RST_STREAM, an endpoint ceases transmission of STREAM frames on
the identified stream.  A receiver of RST_STREAM can discard any data that it
already received on that stream.  An endpoint sends a RST_STREAM in response to
a RST_STREAM unless the stream is already closed." Obviously, this "send an RST back" will not work in an unilateral setup, and at a minimum that text should be updated. But if we want to keep a "right of refusal", we need a new frame, maybe "GOAWAY_STREAM", to indicate that the receiver is now discarding that stream.

> @@ -2291,10 +2291,10 @@ Too Big messages.
 provisional until QUIC's loss detection algorithm determines that the packet is

I would like to see some discussion of unilateral and GOAWAY frame. The current text describing that frame assumes bilateral streams.

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