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types

Operation​

Operation is annotation for rpc that returns longrunning operation, describes message types that will be returned in metadata google.protobuf.Any, and in response google.protobuf.Any (for successful operation).

metadata : string​

Optional. If present, rpc returns operation which metadata field will contains message of specified type.

response : string​

Required. rpc returns operation, in case of success response will contains message of specified field.