[quicwg/base-drafts] STOP_SENDING on implicitly opened streams is error-prone (#2345)

Benjamin Saunders <notifications@github.com> Fri, 18 January 2019 04:44 UTC

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Subject: [quicwg/base-drafts] STOP_SENDING on implicitly opened streams is error-prone (#2345)
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> A stream ID that is used out of order results in all streams of that type with lower-numbered stream IDs also being opened.

> Receiving a STOP_SENDING frame for a locally-initiated stream that is “Ready” or not yet created MUST be treated as a connection error of type STREAM_STATE_ERROR

Streams can easily become open while still in the `Ready` state on the sender if the sender does not necessarily transmit data on streams in exactly the order in which they are allocated. If the receiving application decides to abandon such a stream and sends STOP_SENDING, a connection error results.

If STOP_SENDING is additionally permitted for streams in the `Ready` state which have been implicitly opened by some higher-numbered stream of the same type entering any other state, then implicitly-opened streams can be safely discarded without waiting for a STREAM or RESET_STREAM frame which the application is no longer interested in.

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