def add_url(url, params = {})
      page = Page.new(url, params)
      yield(page) if block_given?
      internal_queue << page.to_json
    end
def add_url(url, params = {})
      page = Page.new(url, params)
      yield(page) if block_given?
      internal_queue << page.to_json
    end
Enqueue an url, no matter what