token_tag

# File actionpack/lib/action_view/helpers/form_tag_helper.rb, line 670
        def token_tag(token)
          if token == false || !protect_against_forgery?
            ''
          else
            token ||= form_authenticity_token
            tag(:input, :type => "hidden", :name => request_forgery_protection_token.to_s, :value => token)
          end
        end