OWIN Hosting with multiple Urls and related configuration

OWINHosting.cs

public static IDisposable HttpInterface(Setting setting, Interface @interface = null, string url = null, bool adminApi = false)
        {
            var httpInterface = WebApp.Start(url ?? @interface.Http.Url, (app) =>
            {
                var config = new HttpConfiguration();
                config.Formatters.JsonFormatter.MediaTypeMappings.Add(new System.Net.Http.Formatting.RequestHeaderMapping("Accept",
                    "text/html",
                    StringComparison.InvariantCultureIgnoreCase,
                    true,
                    "application/json"));
                config.Formatters.JsonFormatter.SerializerSettings.NullValueHandling = NullValueHandling.Ignore;
                config.MapHttpAttributeRoutes();
                config.Routes.MapHttpRoute(
                    "DefaultApi",
                    "api/{controller}/{id}",
                    new { id = RouteParameter.Optional });

                var builder = new ContainerBuilder();
                builder.RegisterApiControllers(Assembly.GetExecutingAssembly());
                builder.RegisterWebApiFilterProvider(config);
                builder.RegisterInstance(setting.Global);
                if (@interface != null)
                {
                    builder.RegisterInstance(@interface);
                }

                var container = builder.Build();
                config.DependencyResolver = new AutofacWebApiDependencyResolver(container);

                app.UseAutofacMiddleware(container);
                app.UseAutofacWebApi(config);
                app.UseWebApi(config);

                if (adminApi)
                {
                    var mountPath = new PhysicalFileSystem(@"./www");
                    var options = new FileServerOptions
                    {
                        EnableDefaultFiles = true,
                        FileSystem = mountPath
                    };
                    options.StaticFileOptions.FileSystem = mountPath;
                    options.StaticFileOptions.ServeUnknownFileTypes = true;
                    options.DefaultFilesOptions.DefaultFileNames = new[]
                    {
                        "index.html"
                    };
                    app.UseFileServer(options);
                }
            });

            return httpInterface;
        }