Reconfigures ActionDispatch's TLD handling dynamically based on the request host, so you don't have to mess with config.action_dispatch.tld_length for cross-device testing using xip.io and friends
Heavily based on Tim Lucas' Gist.
The simplest way to use Rack::TldLength is to use Bundler.
Add Rack::TldLength to your Gemfile:
gem 'tld_length'
Add the following line to your config/environments/development.rb:
config.middleware.use Rack::TldLength, /(x|n)ip\.io/, 5
And you're done!