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by tyingq 2646 days ago
You can't do it from a browser, but the "tls client hello" could certainly hold a custom message of sorts. Either in the "random bytes" it's supposed to send, or stuffed in as a fake cipher preference in the supplied list.

Good breakdown of the handshake here: http://www.moserware.com/2009/06/first-few-milliseconds-of-h... (skip down to the client hello)