Android: What is transport and jsonFactory in GoogleIdTokenVerifier.Builder?

Since all the other answers are blah blah blah, here’s a short answer:

import com.google.api.client.http.javanet.NetHttpTransport;
import com.google.api.client.json.gson.GsonFactory;

GoogleIdTokenVerifier verifier =
    new GoogleIdTokenVerifier.Builder(new NetHttpTransport(), new GsonFactory());