[quicwg/base-drafts] Document what needs to be checked for address validation (#2125)

ekr <notifications@github.com> Wed, 12 December 2018 14:45 UTC

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Subject: [quicwg/base-drafts] Document what needs to be checked for address validation (#2125)
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```
There is no need for a single well-defined format for the token because the
server that generates the token also consumes it.  A token could include
information about the claimed client address (IP and port), a timestamp, and any
other supplementary information the server will need to validate the token in
the future.
```

Unless I'm missing something, we don't actually document or recommend how to validate that a token matches an Initial. I think we should.

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