diff --git a/lib/cartodb/api/map/attributes-layergroup-controller.js b/lib/cartodb/api/map/attributes-layergroup-controller.js
index 632cca9f..2723ebd0 100644
--- a/lib/cartodb/api/map/attributes-layergroup-controller.js
+++ b/lib/cartodb/api/map/attributes-layergroup-controller.js
@@ -31,8 +31,11 @@ module.exports = class AttributesLayergroupController {
     }
 
     register (mapRouter) {
-        mapRouter.get(
-            `/:token/:layer/attributes/:fid`,
+        mapRouter.get('/:token/:layer/attributes/:fid', this.middlewares());
+    }
+
+    middlewares () {
+        return [
             layergroupToken(),
             credentials(),
             authorize(this.authBackend),
@@ -50,7 +53,7 @@ module.exports = class AttributesLayergroupController {
             cacheChannelHeader(),
             surrogateKeyHeader({ surrogateKeysCache: this.surrogateKeysCache }),
             lastModifiedHeader()
-        );
+        ];
     }
 };