fix 404

app.js

@@ -291,7 +291,11 @@ app.get('/rss', (req, res) => {
 
 // Global 404 handler for unmatched routes
 app.use((req, res) => {
-    res.redirect('/');
+    if (req.hostname === hostname) {
+        res.redirect(process.env.HOST_URL);
+    } else {
+        res.redirect('/');
+    }
 });
 
 // Server Listening