I use the .dev domain a lot on localhost when working with Rails apps in development. It seems that the Chrome 63 update has stated enforcing HSTS on .dev domains, which means you'll need self-signed certificates for your dev environment sites to work. Mindblowing! .dev is now an official gTLD that has been bought by Google, so it might be better to switch to another gTLD for development.
# 1. Kill your active puma-dev process
# 2. Change your gTLD of your puma-dev servers
puma-dev -install -d localhost
http://awesomesite.dev will be available on