api-client-config-behavior.html

<script>

    window.PolymerApigility = window.PolymerApigility || {};

    PolymerApigility.ApiClientConfigBehavior = {

        ready: function () {

            if (!this.$.ironAjax) {
                throw "Iron ajax not found";
            }

            /**
             * Set baseUrl if isn't set on the custom element attributes
             */
            var baseUrl = new Polymer.IronMetaQuery({type:'apigility', key: 'base-url'}).value;
            if (!this.baseUrl && baseUrl) {
                this.baseUrl = baseUrl;
            }

            /**
             * Set contentType if isn't set on the custom element attributes
             */
            var contentType = new Polymer.IronMetaQuery({type:'apigility', key: 'content-type'}).value;
            if (!this.contentType && contentType) {
                this.$.ironAjax.contentType = contentType;
            }

            var headers = new Polymer.IronMetaQuery({type:'apigility', key: 'headers'}).value;
            switch (typeof headers) {
                case 'string':
                    try { headers = JSON.parse(headers); }
                    catch(e) { headers = null; }
                    break;
            }

            if (headers) {
                this.$.ironAjax.headers = headers;
            }
        }
    };
</script>