Enable HTTP/2 on Apache?
I've done a bit of research on this and it looks like in order to enable HTTP/2 on Apache, you need a minimum of version 2.4.18. The latest version available in the CentOS repositories is 2.4.6, as the default distro repos tend to favor stability over newer features. The only way that I was able to find to do this on a CentOS 7 system is to build apache from it's source code. On Ubuntu systems, there is a PPA Repository
that can be added to simplify installation a bit, but I can't find a similar process for CentOS 7. I've included Apache's Guide on enabling HTTP/2 by building from source code
for your reference. This is not the lightest reading, but it should get you pointed in the right direction.