Support HTTP2

[item4]

go 1.6 support HTTP2.

Can you make it working with HTTP2?

[itang]

@item4 I'm sorry, I don't know much about HTTP2, but pay attention to that

"Go1.6addstransparentsupportinthenet/httppackageforthenewHTTP/2protocol. Go clients and servers
will automatically use HTTP/2 as appropriate when using HTTPS"

Need a further confirmation that Go 1.6 net/http just only support HTTP2 when using HTTPS?

[item4]

I don't know much about HTTP2 too and I don't know about golang too :(
But, I love this program for testing static web, so I searched some informations.

From this article, we can know we can apply HTTP2 simply with http2.ConfigureServer(srv, &http2.Server{}).

I think(just think) we can use it at this line with some modification.

srv = &http.Server{
    Addr: addr,
}
http2.ConfigureServer(srv, &http2.Server{})
// make self-signed cert (how?)
log.Fatal(srv.ListenAndServeTLS("server.crt", "server.key"))