How to access Ruby web server such as WEBrick or Puma (Rails framework) from other computers on LAN

Alright, so you are familiar with

rails s -b IP_ADDRESS -p PORT

To run the server on the localhost is simple (The default binding IP is

rails s

To make it accessible from another computer on the LAN, you will need to specify your IP address and the port (normally port 80). If your LAN firework blocks port 80, you will need to specify another port then, such as 3000 or 8080.