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