Kong Request with Headers doesn't work due to CORS

Hello,

I’m trying to build a chrome extension which uses my API’s. All my API’s have both ACL and Key Auth in fornt of them and my Key Auth Header is “apikey”. Problem is even though I allowed both “apikey” and “Content-Type” headers in CORS Plugin I still get an error. (HTTP 0)
Am I doing something wrong?

Thanks in advance.