Adding UseStatusCodePages for disabling/enabling status code pages (ex: from IIS)

src/Umbraco.Web.UI.NetCore/Startup.cs

@@ -75,6 +75,7 @@ namespace Umbraco.Web.UI.BackOffice
             {
                 app.UseDeveloperExceptionPage();
             }
+            app.UseStatusCodePages();
             app.UseUmbracoCore();
             app.UseUmbracoWebsite();
             app.UseUmbracoBackOffice();