Add 'Carto-Stat-Tag', 'Carto-User-Id', and 'Carto-Client' headers

lib/api/middlewares/increment-map-view-count.js

@@ -3,9 +3,12 @@
 module.exports = function incrementMapViewCount (metadataBackend) {
     return function incrementMapViewCountMiddleware (req, res, next) {
         const { mapConfig, user } = res.locals;
+        const statTag = mapConfig.obj().stat_tag;
+
+        res.set('Carto-Stat-Tag', `${statTag}`);
 
         // Error won't blow up, just be logged.
-        metadataBackend.incMapviewCount(user, mapConfig.obj().stat_tag, (err) => {
+        metadataBackend.incMapviewCount(user, statTag, (err) => {
             req.profiler.done('incMapviewCount');
 
             if (err) {

lib/api/middlewares/user.js

@@ -14,6 +14,7 @@ module.exports = function user (metadataBackend) {
             }
 
             res.locals.userId = userId;
+            res.set('Carto-User-Id', `${userId}`);
             return next();
         });
     };