const google.golang.org/grpc/credentials/alts/internal/proto/grpc_gcp.HandshakeProtocol_TLS

one use

	google.golang.org/grpc/credentials/alts/internal/proto/grpc_gcp (current package)
		handshaker.pb.go#L33: 	HandshakeProtocol_TLS HandshakeProtocol = 1

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