Re: [quicwg/base-drafts] Saving a round-trip time in the initial handshakes with retry (#2552)

Martin Thomson <> Mon, 01 April 2019 09:25 UTC

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From: Martin Thomson <>
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Subject: Re: [quicwg/base-drafts] Saving a round-trip time in the initial handshakes with retry (#2552)
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To expand on this a little.  I don't anticipate Retry being used very often.  QUIC provides Retry for extraordinary circumstances only.  Most servers will be able to complete the handshake without an explicit address validation step, relying on the implicit address validation provided by the sending and receipt of encrypted packets.  Retry might be used by servers with absurd certificates (maybe), by servers deploying massive PQ key exchange messages (maybe in future), or when servers are under load and they want to validate clients before expending resources.

This therefore less useful than a cross-origin TLS session ticket.  It might have some utility, but I suspect that it won't be necessary in the general case.

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