MVC WebApi Response Type

Hi Experts, have a copy of basic route inside of MVC webapi. I want to add a parameter eg.
response type: xml, json, text and etc. The idea is to define the response type so it is easier for us to organize when they are consumed.

How to tell each mvc controller. And I do not want to Get like api.com/1?responsetype=xml.
I prefer to use in http post so it will be more secure.

Please show me the changes in codes.

Thanks,

 [HttpPost]
        [Route("api/Invoice/CreateInvoiceDetail")]
        public int CreateInvoiceDetail(Domain.Invoice i)
        {
            #region mapping             
            #endregion
            _invoiceNumber = _masterInvoice.CreateInvoiceDetail(_invoice);
            return _invoiceNumber;
        }

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namespace WebAPI
{
    public static class WebApiConfig
    {
        public static void Register(HttpConfiguration config)
        {
            // Web API configuration and services
            // Web API routes
            config.MapHttpAttributeRoutes();
            config.Routes.MapHttpRoute(
                name: "DefaultApi",
                routeTemplate: "api/{controller}/{id}",
                defaults: new { id = RouteParameter.Optional }
            );
        }
    }
}

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