diff --git a/xmlout.js b/xmlout.js
index e73c23d..312d8c1 100644
--- a/xmlout.js
+++ b/xmlout.js
@@ -225,6 +225,8 @@ function createPlainHttpServer() {
             msg = 'SN=' + qs.sn.trim() + '; ' + msg;
         }
 
+        response.end('OK');
+
         callbackReport(request_id, rc, msg);
 
     });