HTTP2
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HTTP/2 is most recent major version of HTTP (with the predecessor HTTP/1.1 still being relevant and in wide use, especially outside browsers).
You can test if your site supports HTTP/2 with this tool: https://tools.keycdn.com/http2-test
See Also
- : Selectively Disabling HTTP/1.0 and HTTP/1.1 (archived) - showing how nginx can be used to serve Upgrade headers to HTTP/1 browsers (and block a bunch of bots and scanners in the process).