Send Headers using WWW Get

Hi,

I have a game deployed on Site A, which uses a WWW call to get data from Site B.
I have enabled CORS settings on Site B and have been able to successfully make a call get the response.

The issue
When I add Headers to the WWW call, I get “Unknown error.” as a response from the server. A WWW call with empty headers results in a successful call.
I have also added the custom header in Access-Control-Allow-Headers, the default headers work fine, like content-type. Is this some issue with WWW?

Why you don’t use UnityWebRequest ?