'How gRPC supports keyword stream when define a rpc protobuf?

I am new to gRPC and protobuf. I notice that gRPC use the keyword stream as the filed rule of arguments when defining a service. But, i can't find any defination of stream in the documents of Protobuf. How gRPC can use stream as the filed rule?

protocol-buffers grpc

Solution 1:^[1]

stream keyword is defined in https://developers.google.com/protocol-buffers/docs/reference/proto3-spec#service_definition . see also https://developers.google.com/protocol-buffers/docs/reference/google.protobuf#method .

Solution 2:^[2]

The stream concept is specific to gRPC, and is covered in the core concepts documentation of gRPC; the short version is:

rpc Unary(RequestType) returns (ResponseType);
rpc ServerStreaming(RequestType) returns (stream ResponseType);
rpc ClientStreaming(stream RequestType) returns (ResponseType);
rpc Duplex(stream RequestType) returns (stream ResponseType);
  // nomenclature: duplex === bidirectional streaming

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Source: Stack Overflow

Solution	Source
Solution 1	Yuki Hashimoto
Solution 2	Marc Gravell

'How gRPC supports keyword stream when define a rpc protobuf?

Solution 1:[1]

Solution 2:[2]

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