hyper supports the final draft of the HTTP/2 specification: additionally,
it provides support for drafts 14, 15, and 16 of the HTTP/2 specification.
It also supports the final draft of the HPACK specification.
hyper is intended to be a drop-in replacement for http.client, with a
similar API. However, hyper intentionally does not name its classes the
same way http.client does. This is because most servers do not support
HTTP/2 at this time: I don't want you accidentally using hyper when you