How to return ‘own’ 404 custom page

asp.nethttp-status-code-404

In case if error occurred on my web site I do the following:

        Server.Transfer("/error.aspx");

and that page has code:

protected void Page_Load(object sender, EventArgs e)
{
    ...

    Response.StatusCode = 404;
}

If I work on the localhost then together with 404 status returned for the page, page displays 'proper error description'.

Once I published the same code to the internet all pages with errors are still displayed with 404 status code, but the don't have the content. Instead, they have the standard 404 error message:

404 – File or directory not found.

if the line "Response.StatusCode = 404" commented out then the proper page is provided, but it has 200 status code.

Question: how to return user-friendly error page that in the same time has 404 error status code?

Any thoughts are welcome! Thanks a lot in advance!

P.S. ASP.NET 4.0

Best Answer

<customErrors mode="On" defaultRedirect="~/Error/GenericErrorPage.aspx">

     <error statusCode="404" redirect="~/Error/404.aspx" />

</customErrors>

http://msdn.microsoft.com/en-us/library/h0hfz6fc(v=vs.71).aspx

http://msdn.microsoft.com/en-us/library/aa479319.aspx

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Original Post:

I was able to get a test web app to work fine, well it at least displayed the custom error page and returned a 404 status code. I can't tell you what is wrong with your app, but I can tell you what I did:

1) Edited the web.config for custom errors:

<customErrors mode="On">
  <error statusCode="404" redirect="404.aspx"/>
</customErrors>

2) Added a 404.aspx page and set the status code to 404.

public partial class _04 : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        Response.StatusCode = 404;
    }
}

Thats about it, if I go to any page extension that is processed by Asp.Net and does not exist, my fiddler log clearly shows a 404, here is the header:

HTTP/1.1 404 Not Found
Server: Microsoft-IIS/5.1
Date: Sun, 07 Dec 2008 06:04:13 GMT
X-Powered-By: ASP.NET
X-AspNet-Version: 2.0.50727
Cache-Control: private
Content-Type: text/html; charset=utf-8
Content-Length: 533

Now if I go to a page that is not processed by Asp.Net, like a htm file, the custom page does not show and the 404 that is configured by IIS is displayed.

Here is a post that goes into some more details that may be of use to you and your problem, my test does do a redirect to the new page so the url of the requested file is pretty much lost (except its in the query string).

Google 404 and .NET Custom Error Pages

Header Spy Response:

HTTP/1.1 404 Not Found
Date: Sun, 07 Dec 2008 06:21:20 GMT

Best Answer

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