rack-timeout will raise errors during HTTP waits

rack-timeout-seems-ok.rb

# in Gemfile
gem 'rack-timeout', '~> 0.4'

# add a throwaway controller for testing
class WaitController < ApplicationController
  def index
    sleep 20
    render plain: 'lol we waited 20 seconds'
  end

  def lol
    HTTParty.get('http://localhost:2017/waitplz')
    render plain: 'wow that worked wtf?'
  end
end

# in config/routes.rb
get 'waitplz', to: 'wait#index'
get 'callplz', to: 'wait#lol'

# start 2 copies of the app
# edit Passengerfile.json to start on port 2017
$ sudo RAILS_ENV=production bundle exec passenger start

# normal dev-mode startup 
$ bundle exec rails s

# then hit localhost:3000/callplz in your browser and you'll be greeted with this a exception:
# Rack::Timeout::RequestTimeoutException at /callplz
# Request ran for longer than 15000ms