[IshKebab]

I think it's more that GRPC (Google's RPC-over-HTTP2 protocol) directly supports Protobuf, and not Flatbuffers. All of Google's Cloud APIs use Protobuf (for example the [Speech API](https://cloud.google.com/speech/reference/rpc/) ).

I have to say, GRPC is pretty great. It's statically typed, supports loads of languages, the interfaces are simple to define (basically Protobuf), and it supports streaming requests! Most RPC systems omit that, or only have message streams (e.g. MQTT). Good RPC systems need both.

The only downside I find is that it is rather complicated (in design; not use).

[forrestthewoods]

As an FYI, GRPC support was added to flatbuffers a month ago. https://github.com/google/flatbuffers/tree/master/grpc