Stella Rouzi follow path from json response

follow.rb

require 'mechanize'
require 'json'

url = 'http://letsrevolutionizetesting.com/challenge.json'
while url do
  # Get content of page
  connection = Mechanize.new
  page = connection.get "#{url}"
  content = JSON.parse(page.content)

  # our json response looks like
  # 'follow' => 'new-url'
  # If we find the follow url,
  # show it to user, and, well, follow it!
  if path = content['follow']
    puts path
    url = content['follow'].sub('?','.json?')
  # If follow key is not found,
  # show the page content
  else
    url = nil
    puts content
  end
end