Invetigate exposing gRPC over Undertow port 8080

[darranl]

It is common that is users are exposing something over HTTP that they want to expose it using the same HTTP listener as everything else i.e. Undertow.

At the core gRPC is well defined messages making use of HTTP/2 - could these be intercepted and passed over the the gRPC server?

The path information sounds like it is /service name/method name so unless we deployed and used the service name to register with Undertow we may need to consider should be on the root context (like our HTTP upgrade support) - however the content-type would be application/grpc which maybe we could detect early in the request handling flow.