added set-header to lumen config

modules/nginx/files/lumen.conf

@@ -28,7 +28,14 @@
     proxy_http_version 1.1;
     add_header Set-Cookie $session_cookie;
     proxy_set_header Upgrade $http_upgrade;
+
+    # Note: comment out below if using subdomain apps
     proxy_set_header X-Script-Name $script_name;
+
+    # Note: uncomment below if using subdomain apps
+    #set $host_name "${lumen_proxy_id}.app.${server_name}";
+    #proxy_set_header X-Forwarded-Host $host_name;
+    
     proxy_set_header Connection $connection_upgrade;
 
   }