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

If you want localhost, one quick way is to specify the binding rails s -blocalhost (and the port with -pNNNN, more options with rails s --help).

My server started running by default on localhost for reasons to be investigated. As a result lvh.me stopped working, preventing me from specifying subdomains (eg: www.lvh.me:3000).

I "solved" this specifying the binding:

rails s -b0.0.0.0 # will work with lvh.me