Fetching data works with ip address but not with localhost

That makes sense. Sorry for bothering you but I want to clear things in my head :smiley:
If I did not google that I must enter 127.0.0.1 how could I know that? Or I must know that the localhost default IP is 127.0.0.1 ?
Should that need to be checked somehow?
Thnx! :slight_smile: