Remote Procedure Calls gRPC https://grpc.io/ Google Remote Procedure Calling Protobufs over HTTP/2 Serialization formats Protobuf https://github.com/protocolbuffers/protobuf https://protobuf.dev/ Cap'n Proto https://capnproto.org/ https://github.com/cstrahan/capnp-ruby Thrift https://thrift.apache.org/ https://thrift.apache.org/static/files/thrift-20070401.pdf https://github.com/facebook/fbthrift/