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Re: [quicwg/base-drafts] Additional error cases for CANCEL_PUSH (#3083)

Mike Bishop <notifications@github.com> Fri, 11 October 2019 15:16 UTC

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Date: Fri, 11 Oct 2019 15:16:27 +0000
From: Mike Bishop <notifications@github.com>
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Subject: Re: [quicwg/base-drafts] Additional error cases for CANCEL_PUSH (#3083)
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MikeBishop commented on this pull request.



> @@ -1093,10 +1094,15 @@ error of type HTTP_FRAME_UNEXPECTED.
 
 The CANCEL_PUSH frame carries a Push ID encoded as a variable-length integer.
 The Push ID identifies the server push that is being cancelled (see
-{{frame-push-promise}}).
+{{frame-push-promise}}).  If a CANCEL_PUSH frame is received which references a
+Push ID greater than currently allowed on the connection, this MUST be treated

The server can issue a CANCEL_PUSH for a push it wasn't allowed to send, which the client should treat as an error.  And since CANCEL_PUSH and MAX_PUSH_ID are on the control stream, if the client uses a Push ID greater than it has permitted, that also seems invalid.

However, in the latter case, I can believe there are implementations where that ordering isn't maintained within the client, so perhaps we should relax that one.

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