Web.config customErrors element with ASP.NET explained

補充一點：httpErrors有個errorMode屬性，預設為DetailedLocalOnly，相當於customErrors mode=RemoteOnly，故在本機測試將看不到自訂錯誤頁，要改成Custom才 ...

The added error element tells ASP.NET to redirect the user to /Notfound.aspx if an exception is thrown and the status code is 404 . You can ...

在ASP.NET 應用程式中發生未處理的例外狀況時，使用者會顯示三個錯誤頁面的其中一個：例外狀況詳細資料黃色的死訊畫面;[執行階段錯誤] 黃色的[死死畫面] ;或 ...

The HTTP status code is used by the ASP.NET infrastructure to redirect the application to the error page when a specific error occurs. Note.

ASP.NET MVC 預設在Filters 上已註冊HandleError，因此預設上發生在ASP.NET 的Http Status Code 500 都會交由HandleErrorAttribute 所處理。

本機端顯示詳細錯誤訊息，非本機端顯示自訂錯誤頁面不想輸入DetailedLocalOnly 文字的話，可以輸入代碼，其代碼為0. Custom.

Like most web.config settings, customErrors can be configured within the Machine.config, root web.config or your application's web.config file.

Remove the defaultRedirect and use the global.asax.cs. Enter some code like this. [ValidateInput(false)] protected void Application_Error() ...

The easiest way to make the behavior consistent is to clear the error and use Response.TrySkipIisCustomErrors and set it to true.

ASP.NET CustomErrors Is Disabled is a vulnerability similar to Misconfigured Access-Control-Allow-Origin Header and is reported with medium-level severity.