On Tue, Jun 13, 2017 at 10:36 AM, Benjamin Kaduk <bka...@akamai.com> wrote:

> That's fine with me as well, though I am now considering the question of
> having an API for the server application to know whether a given request
> was received over 0- or 1-RTT.
>


For s2n, I'm leaning towards recommending the opposite; signaling on the
client side, if opt-in 0-RTT fails, but no signaling on the server side
(though still opt-in). My reasoning is based on experience with that "X-"
server-side header trick; it misleads people into what's going on in a way
that leads to brokenness. The application people think they only have to
de-dupe the 0-RTT sections, but that's not true.

-- 
Colm
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