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

Restarted the os works for me. (On Mac v 10.12)

Answer 2

Rails 4.1 Warning Message.

FYI, on Rails 4.1 you will get a warning message on boot that looks like this:

=> Run `rails server -h` for more startup options
=> Notice: server is listening on all interfaces (0.0.0.0). Consider using 127.0.0.1 (--binding option)

This indicates that binding to 0.0.0.0 is not recommended and instead you should use 127.0.0.1.

In Rails 4.2+ the Rails server default binding is to localhost instead of 0.0.0.0 or even 127.0.0.1.