Use IHttpExceptionStatusCodeFinder to find the http status code

src/Volo.Abp.AspNetCore.Mvc.UI.Theme.Basic/Pages/Error/Index.cshtml

@@ -15,7 +15,7 @@
 }
 
 <h1>
-    [@Model.HttpStatusCode] @errorMessage
+   [@Model.HttpStatusCode] @errorMessage
 </h1>
 
 <div>

src/Volo.Abp.AspNetCore.Mvc.UI.Theme.Basic/Pages/Error/Index.cshtml.cs

@@ -15,10 +15,12 @@ namespace Volo.Abp.AspNetCore.Mvc.UI.Theme.Basic.Pages.Error
         public int HttpStatusCode { get; set; }
 
         private readonly IExceptionToErrorInfoConverter _errorInfoConverter;
+        private readonly IHttpExceptionStatusCodeFinder _statusCodeFinder;
 
-        public IndexModel(IExceptionToErrorInfoConverter errorInfoConverter)
+        public IndexModel(IExceptionToErrorInfoConverter errorInfoConverter, IHttpExceptionStatusCodeFinder statusCodeFinder)
         {
             _errorInfoConverter = errorInfoConverter;
+            _statusCodeFinder = statusCodeFinder;
         }
 
         public void OnGet()
@@ -33,8 +35,10 @@ namespace Volo.Abp.AspNetCore.Mvc.UI.Theme.Basic.Pages.Error
 
             if (HttpStatusCode == 0)
             {
-                HttpStatusCode = HttpContext.Response.StatusCode;
+                HttpStatusCode = (int)_statusCodeFinder.GetStatusCode(HttpContext, exception);
             }
+
+            HttpContext.Response.StatusCode = HttpStatusCode;
         }
     }
 }

src/Volo.Abp.Settings/Volo/Abp/Settings/SettingManagerSyncExtensions.cs

@@ -23,7 +23,7 @@ namespace Volo.Abp.Settings
         public static T Get<T>([NotNull] this ISettingManager settingManager, [NotNull] string name, T defaultValue = default)
             where T : struct
         {
-            return AsyncHelper.RunSync(() => settingManager.GetAsync<T>(name, defaultValue));
+            return AsyncHelper.RunSync(() => settingManager.GetAsync(name, defaultValue));
         }
 
         public static bool IsTrue([NotNull] this ISettingManager settingManager, [NotNull] string name)