They are busy porting millions of lines of code to work on Linux. Cut them a little slack on HTTP2. It's coming I'm sure.
It was overly complicated and there were so many gotchas I found in the proof of concept that I did, I backtracked and went with the ASP.Net Core Framework (aka Asp.Net 5) using Kestral on top of .Net 4.6 and using Hashicorp's Nomad for orchestration.
I'll try again in a year....