IIS trying to browse directory for an empty route attribute

Question

I have created an api controller with attribute routing:

[RoutePrefix("fonts")]
public class InfoController : ApiController
{
    [Route("")]
    [HttpGet]
    public IHttpActionResult GetSomeInfo()
    {
        return Ok(new { Name = "Some name" });
    }
}

And I have a folder in the project root called "fonts".

when I am trying to request:

GET /fonts

IIS throws an error:

HTTP Error 403.14 - Forbidden
The Web server is configured to not list the contents of this directory.

How can I fix this to call the controller action?

UPDATE: Here is the web api config class, which is the default web api configuration created by VS.

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 }
            );
        }
    }

Answer 1

This is solved in this page.

I had to set:

routes.RouteExistingFiles = true;