We are currently using AWS CLB so it is not possible to directly configure it for HTTP/2. However a CLB forwards requests as they are received so if the requests are not restricted to HTTP/1.1 (for example) then it would also forward HTTP/2 requests ? I am looking for similar instructions as this for apache server to disable HTTP/2 forwarding on a PUMA web server running a Ruby on Rails application.
I have not tried anything yet as the puma configuration seems to be the only way to restrict the requests to HTTP/1.1