Re: [quicwg/base-drafts] Clarify that unlinkability is required for NEW_TOKEN tokens. Changes … (#2647)

[Kazuho Oku <[e-mail]>]

kazuho commented on this pull request.



>  A token SHOULD be constructed for the server to easily distinguish it from
 tokens that are sent in Retry packets as they are carried in the same field.
+The token SHOULD NOT expose linkability; i.e., information that lets observers
+correlate the connection that is using the token and the one that issued the
+token.
+
+Unlike the token that is created for a Retry packet, there might be some time
+between when the token is created and when the token is subsequently used.
+Thus, a token SHOULD have an expiration time, which could be either an explicit
+expiration time or an issued timestamp that can be used to dynamically calculate
+the expiration time.  A server can retain the expiration time in the server-side

Applied in 1a0be70.

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