diff --git a/server.js b/server.js
index 627be7a..5f6d536 100644
--- a/server.js
+++ b/server.js
@@ -39,7 +39,9 @@ app.use(renderer)
 
 app.get('/', (req, res) => {
   res.render('index', {
-    baseUrl: req.protocol + '://' + req.headers.host,
+    baseUrl: req.hostname.startsWith('localhost')
+      ? req.protocol + '://' + req.headers.host
+      : '//' + req.hostname, // auto choose http or https
   })
 })