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In this article I’m going to describe how to build simplest gRPC API. Building such API is consists of several steps: First of all, we have to define our API interface with protocol buffers or protobuf. Then we have to generate Golang server and client stubs with protoc command. And finally we need to implement our API. What our service will be doing is a calculations. At the moment it has just one method Add which takes A and B and returns C as an addition result....