Global Fix Custom Error Page Tips

Jan 30, 2022 English

If you are getting a global custom error page error on your machine, you should check out these troubleshooting ideas.

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    If you’re having trouble setting up custom error pages with ASP.NET MVC, you’re not alone. It’s surprisingly difficult to do anything but the right thing, helped by the fact that some errors are handled by ASP.NET and some by IIS.

    Ideally (and I’m assuming some other platforms/servers do) we would just set up our custom error pages to appear in one place and it would work neatly no matter how/where each one occurs error. Something like:

    Custom 404 error pages

    If the resource no longer exists (whether static or dynamic), most of them should return an HTTP 404 level code. Ideally, we should return a specific program that is slightly more convenient for visitors to our online store than error pages / IIS , provided in ASP.NET/IIS, perhaps with clues as to why the resource probably doesn’t exist, or providing a site viewer.

    For the purposes of this My blog post 404 lifestyle page is very simple, but here you can see some really interesting examples.

            404 Page Not Found    

    404 Page Not Found

    I’ve created a new ASP.NET MVC 5 application by selecting the default template in Visual Studio. When I launch the site, I try to navigate to some help that is not there, e.g. /foo/bar I get a standard ASP.NET 404 page with the following info:

    Server error only in application '/'.The resource can not be found.Description: HTTP 404. The resource you were looking for (or a resource based on its dependencies) may have been deleted, its name may have changed, or it may be temporarily unavailable. Please check the following URL and make sure it is spelled correctly.Requested URL: /foo/barVersion Information: Microsoft .NET Framework version: 4.0.30319; ASP.NET version: 4.0.30319.33440

    In this case, this error was caused by ASP.NET MVC. Pay attention to this because no matching controller and/or action could be found.matching the URL you specified.

    To further configure the 404 error page configuration, create the following in the web.config file in : custom error page global


    I have set mode="On" so that we can currently display custom error pages locally. Typically, your company only wants to show what’s special about a production environment, like in the mode="RemoteOnly".


    Now when I go to /foo/bar I see my own error page.

    However, the URL is definitely not /foo/bar as I expected. Instead, ASP.NET defined a redirect to /404.html?aspxerrorpath=/foo/bar. Also, when I check the HTTP coupon code of the response status, it is 200 (OK).

    This is usually very, very wrong. Anything more is misleading because we keep going back to 200 when there’s no useful resource, but that’s also bad for SEO. Just don’t worry if the resource exists at the specified URL if you return a 404 error or redirect it to a new specific location whenmoving the resource.

    To fix this, we can transform the default ASP.NET redirect behavior to help display a custom error page to display the response:


    Unfortunately, this help doesn’t really help our house. Although the original URL is now preserved, ASP.Still net returns any type of 200 response and also displays this popular custom error page in plain text.

    To fix the wrong content type, many of us have to go back to the ASP.NET description page. So if you thought you’d never have to worry about who has *.aspx pages again, then I’m sadly disappointed.

    After renaming the error page to 404.aspx and updating web.config accordingly, your current URL is preserved and we get the correct content type (text/html ) done in the response.

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    In the end, however, we still get an HTTP 200 response. This issue (and it exists) wasrather registered by Microsoft, which then shut it down and simply offered the following solution: you can set the status code on a trusted error page. So, we need to add 404.aspx:

    after the lead


    We now have the standard correct state, the URL, and our non-traditional error page. All done, right?

    If we include a resource that is too static (e.g. foo.html) and a URL that doesn’t match the form to submit our configuration (e.g. /foo/bar/ foo/bar < /code>), users will see the standard IIS 404 error page. custom error page global

    In the above scripts, ASP.NET is usually ignored and handles are requested. Even though you can return HttpNotFound() from your controller implementation, you'll get the same response because MVC just rounds the status code instead of throwing an exception, and let IIS do that. something.

    In these cases, we need to set up custom error web pages in IIS (note that this works in IIS 7+). In the web.config file, add the followingblowing: :


    Similar to ASP.NET custom errors, I set errorMode="Custom" so we can evaluate the error page locally. You usually need this clause to actually get errorMode="DetailedLocalOnly".

    Also note that I'm again using the HTML code page, not aspx. Ideally, you should always use simple static error page software. This idea, if there is something wrong with ASP.NET, you will still be able to see your custom result error.

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