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In distributed systems, we often have to communicate between different services. Code that may look like a local function call, is actually being executed on a different node in another system entirely. This is known as a remote procedure call, or RPC. gRPC is built on top of HTTP/2 so it’s ideal for bidirectional communication; the client can initiate a long-lived connection with the server, over which RPC calls can continuously be sent. We’ll be building a basic unary service method using Go and gRPC.