Moving 421

The alt-svc draft defines the 421 status code.  But it turns out that
we need to have this in order to allow a server to say "don't coalesce
this origin".

Thus, I'm stealing 421 from alt-svc for HTTP/2.  Expect a -13 draft momentarily.

Received on Monday, 16 June 2014 20:19:12 UTC