rties: {
        /*
         * Set this to true if you don't want the form to be submitted through an
         * ajax request, and you want the page to redirect to the action URL
         * after the form has been submitted.
         */
        allowRedirect: {
          type: Boolean,
          value: false
        },
        /**
        * HTTP request headers to send. See PolymerElements/iron-ajax for
        * more details. Only works when `allowRedirect` is false.
        */
        headers: {
         