Why does Ruby on Rails use http://0.0.0.0:3000 instead of http://localhost:3000?

Question

I am very new to Ruby on Rails so when I tried to follow the official \"Getting Started\" ruby on rails tutorial, I was a bit disappointed

Answer 1

For those of us using Nitrous.io virtual server envrionment for development, I believe we have to bind to 0.0.0.0 as there is no localhost per se.