I have the same problem to solve right now. And I see the good idea to sort the type of SNI and non-SNI supported browsers.

But I made up that the user can connect to the server thru HTTP (no SSL), and server determine what kind of browser it is (SNI or non) and depending on the answer redirects to SSL on 443 (default https) for SNI and 4433 for non-SNI.

So does anyone see how to determine if the client browser support SNI?

I am not talking about a bunch of ifs (browser.version < ... or browser.version < ...).
I need more something like TLS+SNI support - yes|no - maybe this kind of combination could tell us - ssl_protocols SSLv3 TLSv1;

Thanks,
Chris