# File lib/aws/cacheable.rb, line 36
    def cache_key
      @cache_key ||= begin
        endpoint_method = self.class.service_ruby_name + "_endpoint"
        config.signer.access_key_id + ":" +
          config.send(endpoint_method) + ":" +
          self.class.name + ":" +
          local_cache_key
      end
    end