diff --git a/drawio/src/main/webapp/viewer.html b/drawio/src/main/webapp/viewer.html
index 333e5dcc89..7386299fdb 100644
--- a/drawio/src/main/webapp/viewer.html
+++ b/drawio/src/main/webapp/viewer.html
@@ -64,7 +64,8 @@
         apiHost = 'localhost:8000'
         }
 
-        const apiPref = `${location.protocol}//${apiHost}`;
+        // const apiPref = `${location.protocol}//${apiHost}`;
+        const apiPref = location.origin ||  `${location.protocol}//${apiHost}`;
 
 
         const _url = `${apiPref}/api/attachments/${parames.id || sessionStorage.getItem('file_id')}/xml_data.json`;