I really want the savings on the wire that TLS flags extension provides – and so I think it’s really good for the future cTLS but I’m not sure when I get to use it in TLS 1.3 negotiation. It goes in the clientHello message, but how will I know that the server uses this extension? I envision a future where we will add the flags extension along with the more expensive 4-bytes version for a REALLY long time.
Is there a plan / ability to turn off the 4-byte version? (BTW: I’m happy if people who really work the details of TLS tell me I mis-understand. I hope I do.)
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