RegisterWebApiRoutes.cs

namespace Sitecore.Feature.Demo.Pipelines
{
  using System.Web.Mvc;
  using System.Web.Routing;
  using Sitecore.Pipelines;

  public class RegisterWebApiRoutes
  {
    public void Process(PipelineArgs args)
    {
      RouteTable.Routes.MapRoute("Feature.Demo.Api", "api/demo/{action}", new
	  {
	     controller = "Demo"
          });
    }
  }
}