Feb 26, Google announced gRPC: http://googledevelopers.blogspot.com.br/2015/02/introducing-grpc-new-open-source-http2.html
In that post they said: "Internally at Google, we are starting to use gRPC to expose most of our public services through gRPC endpoints as part of our long term commitment to HTTP/2.
If they are starting to use gRPC to expose their public APIs... What they are using to communicate internally between applications?
Is there a specific problem in using gRPC also for internal communication between apps?