Comment by gregmac

Also don't use for anything real, because you should not be teaching users that https://1234-5678-9adc-def0-1234-5678-9abc-def0.has-a.name is the proper, trusted domain for your service. Because it was supposed to be https://1234-5678-9abc-def0-1234-5678-9abc-def0.has-a.name and I just tricked you.