OK, so the situation is as follows:
- Cowboy has just got support for HTTP/2. I do not think it’s complete nor stable at the moment.
- HTTP/2 in Elixir is going to be mainly handled by Plug.
- Plug may require some significant changes to support HTTP/2 fully
- Plug/Phoenix guys are waiting for the final/stable Cowboy’s implementation before they make any moves towards HTTP/2 support. Which is probably reasonable.


















