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net/RPC is a rpc implementation in the go standard library, which uses gob for serialization.

gRPC is a protocol and set of libraries for cross-language rpc based on protobuffs. Also doing a lot of codegen for you, like generating clients.

No, this is an RPC and streaming framework built on top of Protobuf and HTTP/2. It's pretty much an open source version of libraries that Google uses pretty much everywhere internally.

No I believe gRPC is a different thing. Don't know what net/rpc is.