I need to set the host for a Firebase Firestore instance and in FirebaseFirestoreSettings.Builder() I have a method setHost() which works with grpc. 
But grpc doesn't support java socks currently.
How can I set a Socks5h proxy for Firebase Firestore?
FirebaseFirestoreSettings.Builder()
    .setHost("socks:///12.3.456.789:1234") //i'ts my proxy
    .builder()
I tried this: socks:///, socks5:///, socks5h:///
It didn't work, throwing a NameResolver exception.