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crypto/tls: remove NPN support #28362
Do the Chrome ULA or Firefox Telemetry dashboards have data on whether NPN or ALPN was used to initiate HTTP/2?
Actually, now I forget the protocol details enough to know whether the client side can even detect whether the server used one vs the other in its decision making process.
Looking at https://telemetry.mozilla.org/dashboard-generator/index.html and adding SPDY_NPN_CONNECT (if that's the right number) + "Add to Dashboard" + "Generate Dashboard" it says 33.12%. Does that mean one third of HTTP/2 is over NPN instead of ALPN? If so, sounds like we shouldn't remove it yet.
/cc @agl too
I wonder what
As a server, our internal data suggests that NPN is very nearly ready to remove. The only exceptions are some gRPC clients using old versions of OpenSSL. (gRPC clients, unlike HTTP clients, are dead in the water if they don't get HTTP/2.)
As a client, I don't have great data off-hand, but I would expect that it would be fine to remove.