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发表于 2015-3-26 17:27:52
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https://blog.cloudflare.com/introducing-universal-ssl/
These challenges required that, for free customers, we limit Universal SSL support to modern browsers. Modern browsers include support for ECDSA, where many legacy browsers do not. Modern browsers also support an extension to the SSL protocol called Server Name Indication (SNI). SNI sends the web site name (the equivalent of the host header) unencrypted, which allows us to return different certificates on an IP address depending on what customer's site is requested. This allows us to serve multiple customers' sites from the same IP.
Generally, if you're running a browser that is less than 6 years old, your browser is modern and Universal SSL on CloudFlare's free plans will work. The two biggest problem children legacy browsers are:
1) Internet Explorer on Windows XP (or older)
2) Android pre-Ice Cream Sandwich
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