I haven't studied this extensively but it looks like a great bit of sample code for someone who wants to see how to do some networking in Go. I echo the other comments that find the use of a custom transport interesting, since writing a transport is one of those things that I've always been glad I haven't had to learn how to do, especially since I'm usually just using HTTP for which Go is very much batteries-included.
This whole thing raises the question though, is this hard to do in other languages?
This whole thing raises the question though, is this hard to do in other languages?