Attribute routing for Umbraco API Controller

controller.cs

// https://our.umbraco.com/forum/extending-umbraco-and-using-the-api/86507-can-i-use-rout-attributes-in-umbraco-controllers#
[RoutePrefix("api/v1/products")]
public class ProductsController : UmbracoApiController
{
    [Route("")]
    public List<Product> GetAllProducts()
    {
        return null;
    }

    [Route("{productId}")]
    public Product GetProduct(int productId)
    {
        //   Throw a clean exception
        throw new HttpResponseException(new HttpResponseMessage
        {
            StatusCode = HttpStatusCode.BadRequest,
            Content = new StringContent("not written")
        });    
    }

    [Route("{productId}/sources")]
    public List<Source> ListProductSources(int productId)
    {
        return null;
    }

    [Route("{productId}/sources/{sourceId}")]
    public Source GetProductSource(int productId, int sourceId)
    {
        return null;
    }

}