How Postman read gRPC address ?

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So I have a gRPC address, in Postman we will call it like this targetHost:80/subgrpc

But in our Testing Framework, using NodeJs and Java lang, we have to enable like this
For NodeJs:
grpc.default_authority: targetHost + “/subgrpc”
For Java:
ManagedChannelBuilder(“targetHost:80”).overrideAuthority: “/subgrpc”

So what I’m curious, which gRPC library is Postman using ? Since both the settings are COMPLETELY different in method of connecting, this potentially may cause a lot of confusion during testing time.