I'm trying to set up authentication on a local host and need a url, but third parties don't recognize localhost:3000. I think I remember that someone found a solution to this problem by registering a domain that points to the local host ip address. The domain was something like "lvhm3000" but when I google that, it doesn't give me what I'm looking for.
Just to be clear, I'm looking for the callback url that I would enter on, for example, Twitter's site so that it would redirect to local host after authentication...