1.6 http package doc incorrectly states support for HTTP/2 is automatic

[hapnermw]

Please answer these questions before submitting your issue. Thanks!

1. What version of Go are you using (go version)? 1.6
2. What operating system and processor architecture are you using (go env)? OS X, darwin-64
3. What did you do?
   Attempted to use http Client for HTTP/2
4. What did you expect to see?
   Client supported HTTP/2
5. What did you see instead?
   Client only supported HTTP 1.1

You must still use golang.org/x/net/http2 ConfigureTransport to create an HTTP/2 client. I verified this with the http2.golang.org. Both the http docs and the golang.org/x/net/http2 docs imply that the 1.6 http package now automatically support HTTP/2 for both Client and Server. They do not.

[ianlancetaylor]

It's an unfortunate known bug, already fixed on tip. Issue #14391.