Puma not binding correctly

[edwardloveall]

On a rails project rails 4.2.1 I'm running puma for a server. Burrow will not work with it unless I bind to 0.0.0.0:

rails s -b0.0.0.0

Otherwise, my burrow link redirects to https://burrow.io/down

Here's the text puma spits out when I boot a server normally:

=> Booting Puma
=> Rails 4.2.1 application starting in development on http://localhost:3000
=> Run `rails server -h` for more startup options
=> Ctrl-C to shutdown server
Puma 2.12.1 starting...
* Min threads: 0, max threads: 16
* Environment: development
* Listening on tcp://localhost:3000