[quicwg/base-drafts] What does GREASE mean for error codes? (#4857)

Victor Vasiliev <notifications@github.com> Tue, 30 March 2021 15:38 UTC

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Date: Tue, 30 Mar 2021 08:38:17 -0700
From: Victor Vasiliev <notifications@github.com>
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Subject: [quicwg/base-drafts] What does GREASE mean for error codes? (#4857)
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We currently reserve a subset of the error code space for GREASE purposes, at least in HTTP/3.  However, we give no guidance on how to use this.  One possible interpretation is that peers should randomly replace their real error codes with a GREASE codepoint; however, some of the error codes we use do have special meaning (e.g. H3_REQUEST_REJECTED would normally result in the browser retrying the request) that would be lost, so that does not seem like an appropriate approach.

I think we should provide an explicit guidance to implementations or un-reserve those codepoints.

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