Don't allow param for POST

Global.asax.cs

protected void Application_Start(object sender, EventArgs e) {

    var config = GlobalConfiguration.Configuration;
    var routes = config.Routes;

    routes.MapHttpRoute(
        "DefaultHttpRoute",
        "api/{controller}/{id}",
        new { id = RouteParameter.Optional },
        new {
            httpMethod = new HttpMethodConstraint(
                new[] { HttpMethod.Get, HttpMethod.Delete, HttpMethod.Put }
            ) 
        }
    );

    routes.MapHttpRoute(
        "DefaultPostHttpRoute",
        "api/{controller}",
        new { },
        new {
            httpMethod = new HttpMethodConstraint(
                new[] { HttpMethod.Post }
            )
        }
    );
}