request from a url, please not the cors.

index.html

@@ -9,7 +9,7 @@
 </head>
 
 <body>
-    <!-- <input type="text" id="ics_file"> -->
+    <input type="text" id="ics_file">
     <input type="button" value="hi" id="ics_run">
     <div id="calendar"></div>
 </body>