Re: [quicwg/base-drafts] Strengthen 2119 language around tokens. (#2124)

Martin Thomson <> Thu, 13 December 2018 00:16 UTC

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Subject: Re: [quicwg/base-drafts] Strengthen 2119 language around tokens. (#2124)
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martinthomson commented on this pull request.

The second change I like.  The first less so.

> @@ -1627,7 +1627,7 @@ interface.  A client needs to start the connection process over if it migrates
 prior to completing the handshake.
 When a server receives an Initial packet with an address validation token, it
-SHOULD attempt to validate it, unless it has already completed address
+MUST attempt to validate it, unless it has already completed address

We also use MUST for security problems.

> @@ -1610,7 +1610,7 @@ A resumption token SHOULD be constructed to be easily distinguishable from
 tokens that are sent in Retry packets as they are carried in the same field.
 If the client has a token received in a NEW_TOKEN frame on a previous connection
-to what it believes to be the same server, it can include that value in the
+to what it believes to be the same server, it SHOULD include that value in the

I think that we need text on why it might not.  I suspect that this is a MUST unless (sending from a new address) OR (you don't feel like it).

I think that the "can" is fine here.

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