XMLHttpRequest Error

YungKaiChin — Tue, 16 Dec 2014 19:05:08 GMT

I am investigating an error message in console.

Error:

XMLHttpRequest cannot load http://[url]/arcgis/rest/info?f=json. The 'Access-Control-Allow-Origin' header contains multiple values '[url], *', but only one is allowed. Origin '[url]' is therefore not allowed access.

In our web.config, it seems to be what it needs to be:

<?xml version="1.0" encoding="utf-8"?>
<configuration>
<system.webServer>
   <httpProtocol>
     <customHeaders>
       <add name="Access-Control-Allow-Origin" value="*" />
     </customHeaders>
   </httpProtocol>
</system.webServer>
</configuration>

The error does not appear to affect the app, but it keeps popping up in console.
So I am wondering how I can do about this error.

topic XMLHttpRequest Error in ArcGIS JavaScript Maps SDK Questions

XMLHttpRequest Error