It Follows...

follow.rb

require 'httparty'

def fetch(url)
  response = HTTParty.get(url)
  response.parsed_response
end 

# Setting content type didn't work 😢
def to_json_request(url)
  url.gsub('challenge', 'challenge.json')
end

url = 'https://www.letsrevolutionizetesting.com/challenge.json'
response = fetch(url)
follow = to_json_request(response['follow'])
while follow  
  response = fetch(follow)
  puts response
  
  if response['follow']
    follow = to_json_request(response['follow'])
  else
    follow = nil
  end
end