is-online

First of all, THANK YOU, for adding the new fallbackUrls! As I started incorporating is-online into my app, I noticed something unexpected: the seem to be running in parallel with the first request (e.g. https://ipv4.icanhazip.com). My concern with this is that it goes against the plain meaning of a , and as such people may assume (like I did) that I could use my own server as a fallback without having to worry much about the added request costs associated with pinging every 10 seconds. When I saw that it was in parallel with the first request, I needed to hunt for a public alternative that may not worry about my app's usage of that (others may not be so forgiving?) (IBTW: 'm not opposed with being able to add in as well, but that may be overkill for most use cases.) Original behavior (only https://ipv4.icanhazip.com runs): New behavior (https://ipv4.icanhazip.com + fallback url, in this case https://checkip.amazonaws.com, since it's the only one that I could get to work with my dev local server in Brave) Expected original behavior, and only fallback to fallbackUrls in parallel (along with https://api.ipify.org) when the first one fails. Thanks again!