Custom Error Page Code
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you're not alone. It's surprisingly difficult to do this correctly, not helped by the fact that some errors are handled by ASP.NET and others by IIS. Ideally (and I expect such http://benfoster.io/blog/aspnet-mvc-custom-error-pages is the case with some other frameworks/servers) we would just configure our custom error pages in one place and it would just work, no matter how/where the error was raised. Something like:
404 Page Not Found
I created a new ASP.NET MVC 5 application using the standard template in Visual Studio. If I run the site and try to navigate to a resource that does not exist e.g. /foo/bar, I'll get the standard ASP.NET 404 page with the following information: Server Error in '/' Application. The resource cannot be found. Description: HTTP 404. The resource you are looking for (or one of its dependencies) could have been removed, had its name changed, or is temporarily unavailable. Please review the following URL and make sure that it is spelled correctly. Requested URL: /foo/bar Version Information: Microsoft .NET Framework Version:4.0.30319; ASP.NET Version:4.0.30319.33440 Not exactly friendly, is it? In this case the error was raised by ASP.NET MVC because it could not find a matching controller and/or action that matched the specified URL. In order to set up a custom 404 error page add the following to web.config insidewill also provide a plain black and white error page for you with a basic description, but nothing fancy. Depending on the error code it is less or more likely for the user to actually see such an error. Common Error Codes¶ The following error codes are some that are often displayed to the user, even if the application behaves correctly: 404 Not Found The good old "chap, you made a mistake typing that URL" message. So common that even novices to the internet know that 404 means: damn, the thing I was looking for is not there. It's a very good idea to make sure there is actually something useful on a 404 page, at least a link back to the index. 403 Forbidden If you have some kind of access control on your website, you will have to send a 403 code for disallowed resources. So make sure the user is not lost when they try to access a forbidden resource. 410 Gone Did you know that there the "404 Not Found" has a brother named "410 Gone"? Few people actually implement that, but the idea is that resources that previously existed and got deleted answer with 410 instead of 404. If you are not deleting documents permanently from the database but just mark them as deleted, do the user a favour and use the 410 code instead and display a message that what they were looking for was deleted for all eternity. 500 Internal Server Error Usually happens on programming errors or if the server is overloaded. A terribly good idea is to have a nice page there, because your application will fail sooner or later (see also: Application Errors). Error Handlers¶ An error handler is a function, just like a view function, but it is called when an error happens and is passed that error. The error is most likely a HTTPException, but in one case it can be a different error: a handler for internal server errors will be passed other exception instances as well if they are uncaught. An error handler is registered with the errorhandler() decorator and the error code o