cache.rb

require 'typhoeus'

class Cache
  def initialize
    @memory = {}
  end

  def get(request)
    @memory[request]
  end

  def set(request, response)
    @memory[request] = response
  end
end

Typhoeus::Config.cache = Cache.new

p Typhoeus.get('www.example.com', cache_ttl: 1).cached? #=> false
Kernel.sleep(2)
p Typhoeus.get('www.example.com').cached? # this would be true without cache_ttl #=> false