[tyler_larson]

> For instance HTTP 2.0 does not require TLS, but none of the browsers support plain text HTTP 2.0. (So the browsers are ignoring the standard)

H2 requires TLS for practical reasons; without it, poorly-written transparent proxies mangle this protocol that they don't understand. Requiring SSL was the solution to this otherwise intractable problem during the initial SPDY work, and became a hard requirement for SPDY. But due to pressure from certain groups during the IETF standardization process (who didn't want the web to "go dark"), this requirement from SPDY was dropped in the official HTTP2 spec.

But dropping the requirement from the spec doesn't solve the problem that put it there in the first place. You still can't reliably use any protocol newer than HTTP/1.1 unencrypted with many ISPs. It's been demonstrated to fail in ways that are difficult to debug and which would otherwise make HTTP2 seem unreliable. So no consumer-facing implementation will let you try.