[quicwg/base-drafts] The method of identifying "the same server" (#3155)

[Kazuho Oku <[e-mail]>]

At the moment, [section 8.1.2 of the transport draft](https://quicwg.org/base-drafts/draft-ietf-quic-transport.html#rfc.section.8.1.2) states that a resumption token can be used "_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._"

But what does "the same server" actually mean?

Some possible answers include:

* a) the same server IP address
* b) the same server IP address and port
* c) any server name that was presented in the certificate provided in the previous connection (the scope of session tickets; see [RFC 8446; section 4.6.1]( https://tools.ietf.org/html/rfc8446#section-4.6.1))
* d) the same server-name
* e) the same server-name and ALPN (the scope of 0-RTT; see [RFC 8446; section 4.2.10](https://tools.ietf.org/html/rfc8446#section-4.2.10))

I'd presume it to be one of a, b, or c, but I think it'd be better to clarify what "the same server" actually means.

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