As of the Telerik UI for ASP.NET MVC R3 2019 release, you can set request headers by using the Headers configuration option of the DataSource.

The following example demonstrates how to use the Headers option to set a request header.

        .Ajax(d => d.Read(r => r.Action("ReadOrders", "Home").Headers(new { header1 = "test" })))

        myDataSource.read(); // The header will be set in the request that is sent to the HomeController ReadOrders action.

    public IActionResult ReadOrders([DataSourceRequest]DataSourceRequest request)
        // Orders can be IQueriable or IEnumerable.
        return Json(orders.ToDataSourceResult(request));

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