Hello

I am using a content finder (IContentLastChanceFinder) just fine for serving out a custom page for “Not found”/404 content requests. However, I am struggling to work out how to use a custom 404 page for static files (missing images etc).

I see that in the Umbraco core source code that the method RegisterDefaultRequiredMiddleware() https://github.com/umbraco/Umbraco-CMS/blob/v9/contrib/src/Umbraco.Web.Common/ApplicationBuilder/UmbracoApplicationBuilder.cs Umbraco registers “UseStatusCodePages” and “UseStaticFiles”, so to compliment that I thought a technique from https://bauchart.be/2017/10/01/custom-404-pages-in-asp-net-core-for-routes-and-static-files/ where my middleware replaces a 404 with my custom path (older page I know but the approach still sounds ok):

    //Perform middleware for custom 404 page
app.Use(async (context, next) => {
    await next();
    if(context.Response.StatusCode == 404)
    {
        context.Request.Path = "/404";
        await next();
    }
});

That didn’t work, so I tried the following with my custom path:

UseStatusCodePagesWithReExecute("/notfound");

That didn’t work either. I'm not really sure if its because Umbraco core has already registered middleware and I can’t override/supersede that or that my registration sequence is incorrect (i did try things in different order), so any thoughts/ideas would be welcome.

I see that the donet site says its running .net 6 RC and a request for a static file results in a custom 404 https://dotnet.microsoft.com/missing.png

Thanks

Andrew