asp.net-core razor-pages asp.net-core-identity asp.net-core-7.0

Separate status code pages in ASP.NET Core Razor Pages

I'm using ASP.NET Core Razor Pages with Identity. I use the StatusCodePages middleware in the standard way:

app.UseStatusCodePagesWithReExecute("/Error", "?statusCode={0}");

In that razor page, I can switch on the status code to render different content for 401, 403, 404 and "other" (all other codes in range 400..599). However that gets messy; I prefer separate pages.

So instead of this:

/Pages/Error.cshtml

I want this:

/Pages/401.cshtml
/Pages/403.cshtml
/Pages/404.cshtml
/Pages/400_599.cshtml

Is that possible?

Ugly workarounds which I already know about:

I could use the URL template "/Error/{0}", but that's impractical: I'd have to define a separate page for every code in the range 400..599. I definitely cannot do this.
In the "/Pages/Error.cshtml.cs" page model class I could redirect to different pages based on the status code. I prefer not to do this, I suspect it's bad for SEO.
For the "/Error" endpoint I could use an MVC controller with views (instead of Razor Pages); the action method could return the appropriate view. Not a bad solution, but adds unnecessary complexity; I prefer a Razor Pages approach.

Solution

I want this:

/Pages/401.cshtml /Pages/403.cshtml /Pages/404.cshtml /Pages/400_599.cshtml Is that possible?

Of course you can, just create the page in Pages folder like below:

Then use app.UseStatusCodePagesWithReExecute("/{0}") in Program.cs:

app.UseStatusCodePagesWithReExecute("/{0}");
app.UseExceptionHandler("/500");

//app.UseDeveloperExceptionPage();

app.UseHttpsRedirection();
app.UseStaticFiles();

app.UseRouting();

app.UseAuthorization();

app.MapRazorPages();

app.Run();

For the catch-all page, you can maitain the Error Pages like below:

@page "/Error/{statusCode}"
@model ErrorModel
@{
    var statusCode = HttpContext.Request.RouteValues["statusCode"];

}
@switch (statusCode)
{
    case "400":
        <h1>BadRequest</h1>
        <p>You send wrong model to this resource.</p>
        break;
    case "401":
        <h1>Unauthorized</h1>
        <p>You are not authorized to this resource.</p>
        break;
    case "403":
        <h1>Forbidden</h1>
        <p>You don't have permission to this resource.</p>
        break;
    case "404":
        <h1>Not Found</h1>
        <p>The resource you are looking for could not be found.</p>
        break;
    default:
        <h1>Error @(statusCode)</h1>
        <p>An error occurred while processing your request.</p>
        break;
}

Program.cs:

 app.UseStatusCodePagesWithReExecute("/Error/{0}");
 app.UseExceptionHandler("/Error/500");