This is oddly worded to me and likely going to cause grief as it sounds like your app can only run on IPV6. I would interpret is as your app must be able to ru

This is oddly worded to me and likely going to cause grief as it sounds like your app can only run on IPV6. I would interpret is as your app must be able to run internet connected when IPV4 is not available. This likely includes your local loopback if you are using 127.0.0.1 (which I infer from the hard code statement). Or another weird to put it, your application must be IPV6 with the option of a IPV4 add-on.