How to implement method overloading in webapi

By decorating ActionName attribute -

public class MyController : ApiController
{
   [ActionName("GetById")]
   public Foo Get(int id) { //whatever }

   [ActionName("GetByString")]
   public Foo Get(string id) { //whatever }

   [ActionName("GetByGUID")]
   public Foo Get(Guid id)  { //whatever }
}

Or,

By routing decoration-

//Should match /api/My/1
        config.Routes.MapHttpRoute(
            name: "DefaultDigitApi",
            routeTemplate: "api/{controller}/{id}",
            defaults: new { action = "GetById" },
            constraints: new { id = @"^\d+$" } // id must be digits
        );

        //Should match /api/My/3ead6bea-4a0a-42ae-a009-853e2243cfa3
        config.Routes.MapHttpRoute(
            name: "DefaultGuidApi",
            routeTemplate: "api/{controller}/{id}",
            defaults: new { action = "GetByGUID" },
            constraints: new { id = @"^(\{{0,1}([0-9a-fA-F]){8}-([0-9a-fA-F]){4}-([0-9a-fA-F]){4}-([0-9a-fA-F]){4}-([0-9a-fA-F]){12}\}{0,1})$" } // id must be guid
        );

        //Should match /api/My/everything else
        config.Routes.MapHttpRoute(
            name: "DefaultStringApi",
            routeTemplate: "api/{controller}/{id}",
            defaults: new { action = "GetByString" }
        );