error404 not working with media items or pdf extension - Using Umbraco And Getting Started

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David Armitage 505 posts 2073 karma points

Sep 07, 2022 @ 06:13

0

error404 not working with media items or pdf extension

Using Umbraco And Getting Started

Umbraco 8

Hi All,

I noticed that the custom errors dont work from media items. Are maybe this is regated to certain extensions.

For example. I have custom errors set for error404 in the UmbracoSettings.config. If I enter a wrong URL then this redirects to my 404 page ok.

But them when I enter a bugus URL with a .pdf on the end then the redirect doesn't work and I am still presented with the generic IIS 404 - File or directory not found error screen which I am trying to avoid for a vulnerability scan.

Any idea how to get the error404 config working for everything including PDFs?

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Huw Reddick 1736 posts 6076 karma points MVP c-trib

Sep 08, 2022 @ 10:39

I added the check below in my startup.cs in the section where I add some response headers, that should catch any 404 (/error404 is my umbraco page)

        app.Use(async (context, next) =>
        {
            context.Response.Headers.Add("X-Xss-Protection", "1; mode=block");
            context.Response.Headers.Add("Strict-Transport-Security", "max-age=31536000");
            context.Response.Headers.Add("X-Content-Type-Options", "nosniff");
            context.Response.Headers.Add("X-Frame-Options", "SAMEORIGIN");
            await next();
            if (context.Response.StatusCode == 404)
            {
                context.Request.Path = "/error404";
                await next();
            }
        });

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David Armitage 505 posts 2073 karma points

Sep 08, 2022 @ 10:45
0
Hi Huw,

Sorry I forgot to mention this was for Umbraco 8. Anyway I figure this out.

I could not for the liufe of me figure out a solution using the standard Umbraco config. It just didn't handle certain extensions like .pdf and a few others.

Instead I create some IIS rules to handle the errors. This seemed to work.
```
<httpErrors errorMode="Custom" existingResponse="Replace">
    <remove statusCode="404" />
    <error statusCode="404" responseMode="ExecuteURL" path="/page-not-found/" />
</httpErrors>
```
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Huw Reddick 1736 posts 6076 karma points MVP c-trib

Sep 08, 2022 @ 10:48

0

yes that's what you need to do, basically because they are considered to be static files so the error comes from IIS not Umbraco

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