Fix an issue when deleting a key from the proxy

www/file/inner.html

@@ -4,6 +4,7 @@
     <meta content="text/html; charset=utf-8" http-equiv="content-type"/>
     <link rel="stylesheet" href="/bower_components/components-font-awesome/css/font-awesome.min.css">
     <script src="/bower_components/jquery/dist/jquery.min.js"></script>
+    <script src="/bower_components/bootstrap/dist/js/bootstrap.min.js"></script>
     <link rel="stylesheet" href="/bower_components/bootstrap/dist/css/bootstrap.min.css">
     <link rel="stylesheet" href="file.css" />
 </head>