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Re: [quicwg/base-drafts] Requiring per application data in session ticket seems wrong (#3028)

Kazuho Oku <notifications@github.com> Fri, 13 September 2019 06:31 UTC

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Subject: Re: [quicwg/base-drafts] Requiring per application data in session ticket seems wrong (#3028)
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@mikkelfj 
> If the ALPN-Y endpoint does not understand how to at least ignore ALPN-X data in the token, you can get undefined behaviour.

I do not think so. In the case you describe, the TLS stack will not indicate to the QUIC stack that 0-RTT is acceptable because the ALPN is different. Therefore, the QUIC stack handling ALPN-Y would not use the application-protocol-specific data in the session ticket (as it is expected to be used only when early data is acceptable  - that's what section 5.4 of the transport draft says). Hence no confusion.

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