[c#] Asp.Net WebApi2 Enable CORS not working with AspNet.WebApi.Cors 5.2.3

I just experienced this same issue, trying to enable CORS globally. However I found out it does work, however only when the request contains a Origin header value. If you omit the origin header value, the response will not contain a Access-Control-Allow-Origin.

I used a chrome plugin called DHC to test my GET request. It allowed me to add the Origin header easily.

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