Created dedicated controller and pages to status pages.

FileStorageService.www/Controllers/ErrorController.cs

@@ -0,0 +1,13 @@
+using System.Net;
+using Microsoft.AspNetCore.Mvc;
+
+namespace FileStorageService.www.Controllers;
+
+public class ErrorController : Controller
+{
+	// GET
+	public IActionResult Status(int id)
+	{
+		return View(id);
+	}
+}

FileStorageService.www/Controllers/HomeController.cs

@@ -27,12 +27,4 @@ public class HomeController : Controller
 	{
 		return View();
 	}
-
-	[ResponseCache(Duration = 0, Location = ResponseCacheLocation.None,
-		NoStore = true)]
-	public IActionResult Error()
-	{
-		return View(new ErrorViewModel
-			{ RequestId = Activity.Current?.Id ?? HttpContext.TraceIdentifier });
-	}
 }

FileStorageService.www/Program.cs

@@ -30,12 +30,14 @@ if (app.Environment.IsDevelopment())
 }
 else
 {
-	app.UseExceptionHandler("/Home/Error");
 	// The default HSTS value is 30 days. You may want to change this for production scenarios, see https://aka.ms/aspnetcore-hsts.
 	app.UseHsts();
 }
 
 app.UseHttpsRedirection();
+
+app.UseStatusCodePagesWithRedirects("/Error/Status/{0}");
+
 app.UseRouting();
 
 app.MapStaticAssets();

FileStorageService.www/Views/Error/Status.cshtml

@@ -0,0 +1,25 @@
+@model int
+
+@{
+	ViewBag.Title = $"Status - {Model}";
+	Layout = "_Layout";
+}
+
+<div class="text-center">
+	<h2>Sorry - Status @Model</h2>
+	@switch (Model)
+	{
+		case 404:
+			<p>Sorry it looks like the resource you clicked on, doesn't exist...</p>
+			<p>Which is strange, unless you created the link yourself</p>
+			<p>If you clicked a link, my apologies</p>
+			<p>If you copied the link, make sure it is correct.</p>
+			break;
+		default:
+			<p>Sorry I hadn't planned for this error occuring...</p>
+			<p>Which I agree, is rather awkward.</p>
+			break;
+	}
+	<p>here's a complementary link back to files</p>
+	<a asp-controller="Files" asp-action="Index" class="btn btn-primary">Go back to Files</a>
+</div>