Add From File (KML) in Add Data widget blocked by CORS - proxy not working

JoeRogan — Fri, 13 Dec 2019 20:04:55 GMT

Hi, I am using the Add Data widget in several apps. When adding a KML via the drop, it works in my workspace environment where I don't require a proxy to access the services. When the app is deployed to Test/Prod environments is uses the Esri resource-proxy to access the secured services, webmap, etc. I have rules in the proxy configured for

https://mydomain/portal/sharing and https://mydomain/arcgis/rest/services which works for everything except this.

There browser error I get looks like this:

(index):1 Access to XMLHttpRequest at 'https://mydomain/portal/sharing/kml' from origin 'https://appdomain' has been blocked by CORS policy: The value of the 'Access-Control-Allow-Origin' header in the response must not be the wildcard '*' when the request's credentials mode is 'include'. The credentials mode of requests initiated by the XMLHttpRequest is controlled by the withCredentials attribute.
AddFromFilePane.js?wab_dv=2.10:387 Unable to load KML

I've narrowed this down to the widget's use / lack of use of the proxy by disabling it temporarily (and ignoring layer load errors) and it does work when deployed to those web servers. What I don't get is that in both the working and problem environments, the requests look exactly the same in the network tab, so I'm not sure what is wrong. Any advice? Thanks!

Re: Add From File (KML) in Add Data widget blocked by CORS - proxy not working

shaylavi — Mon, 23 Dec 2019 05:13:06 GMT

Sounds like it might be the security settings in Chrome. Have you tried with IE?

You can bypass Chrome security with the following command - start chrome.exe --disable-web-security

topic Re: Add From File (KML) in Add Data widget blocked by CORS - proxy not working in Web AppBuilder Custom Widgets Questions

Add From File (KML) in Add Data widget blocked by CORS - proxy not working

Re: Add From File (KML) in Add Data widget blocked by CORS - proxy not working