The 'Access-Control-Allow-Origin' header contains multiple values '*,*', but only one is allowed. Origin 'null' is therefore not allowed access.

[matrozzi]

Hi, I'm trying to implement this demo Bot but I'm getting this error:

The 'Access-Control-Allow-Origin' header contains multiple values ',', but only one is allowed. Origin 'null' is therefore not allowed access.

The "null" value appears when I try it from my PC, but from a Sharepoint Server I get the URL of that server.

It seems that's something to do with CORS, any suggestion on how to fix it?

Thanks!

[lapuball]

I am facing the similar issue too, did you get it working?

Failed to load XXXX: Response to preflight request doesn't pass access control check: No 'Access-Control-Allow-Origin' header is present on the requested resource. Origin 'http://localhost' is therefore not allowed access.

[matrozzi]

Hi lapuball ! Yes, I could solved it. I've found a line in the code (don't remember know if it was in openwhisk or widget) and commented it. Now my trial account expired, and I can't see it. But here I saw the code updated few days ago, and the line isn't there anymore. See the "Cors Update" comment. I think that they updated the code here to work.

I hope it helps !!
Regards