A dense, no-marketing-fluff guide to gRPC: HTTP/2 foundations, the four call types, deadlines, interceptors, the error model, load-balancing gotchas, and when to reach for Connect or REST instead.
Protobuf
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gRPC From the Ground Up -
Buf: The Modern Protobuf Toolchain Replace protoc with Buf for schema linting, breaking change detection, remote code generation, and a registry for your Protobuf APIs.