public class Startup
{
  public void Configuration(IAppBuilder app)
  {
    var builder = new ContainerBuilder();
    // STANDARD WEB API SETUP:
    // Get your HttpConfiguration. In OWIN, you'll create one
    // rather than using GlobalConfiguration.
    var config = new HttpConfiguration();
    // Register your Web API controllers.
    builder.RegisterApiControllers(Assembly.GetExecutingAssembly());
    // Run other optional steps, like registering filters,
    // per-controller-type services, etc., then set the dependency resolver
    // to be Autofac.
    var container = builder.Build();
    config.DependencyResolver = new AutofacWebApiDependencyResolver(container);
    // OWIN WEB API SETUP:
    // Register the Autofac middleware FIRST, then the Autofac Web API middleware,
    // and finally the standard Web API middleware.
    app.UseAutofacMiddleware(container);
    app.UseAutofacWebApi(config);
    app.UseWebApi(config);
  }
}