Is it possible to enable HTTP/2 on OpenShift?

Issue

• Is it possible to use HTTP/2 other than TLS passthrough route?
• Since the standard router in OpenShift is an HA-proxy and HA-proxy itself has HTTP/2 support, is it possible to enable HTTP/2 support for custom apps?
• How to use HTTP/2 with OpenShift?
• There is a series of services that have to be deployed as part of a project, and they all talk between each other using gRPC protocol which implements the HTTP/2 standard. How to configure the routes and services to allow this traffic between pods themselves, and with external clients?
• There are several microservices that need to talk to each other using gRPC and an external interface to expose through service/router. Since gRPC uses HTTP/2, is it supported in OpenShift?
• Can the default router in OpenShift 3 handle HTTP/2 requests?