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What is the difference between proto2 and proto3 syntax? What is the difference between a blocking stub, a non-blocking async stub, and a future stub in generated gRPC client code? What is a gRPC channel, and how does it differ from a single HTTP connection? How does protobuf handle backward and forward compatibility? What are the main ways to integrate gRPC into a Spring Boot application? How do you create and inject a gRPC client stub in Spring? What are the four types of service methods gRPC supports? What is the role of the protoc compiler and code-generation plugins in a Spring project? What are the advantages of Protocol Buffers over JSON for service payloads? Explain field numbering in a.proto message and why it matters? What Java types do common protobuf scalar types map to? How do you handle optional vs unset primitive fields in proto3? What does the @GrpcService annotation do? How do you configure the gRPC server port in a Spring Boot app using the community starter? What is gRPC and why would you use it in a Spring application? How does gRPC differ from traditional REST APIs? What role does HTTP/2 play in gRPC? What is a.proto file and what is it used for? What are gRPC status codes, and how do they compare to HTTP status codes? How does Spring's dependency injection interact with generated gRPC service classes?

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