public static void WriteAccessControlHeaders(this HttpMessageWriter writer)
 {
     writer.WriteAccessControlAllowOrigin(true);
     writer.WriteAccessControlAllowCredentials(true);
     writer.WriteAccessControlAllowHeaders(accessControlAllowHeaders);
     writer.WriteAccessControlExposeHeaders(accessControlExposeHeaders);
     writer.WriteAccessControlAllowMethods(Methods.Get, Methods.Post, Methods.Options);
 }