Special page to handle 404 errors

BTCPayServer/Controllers/ErrorController.cs

@@ -12,6 +12,14 @@ namespace BTCPayServer.Controllers
     {
         public IActionResult Handle(int? statusCode = null)
         {
+            if (statusCode.HasValue)
+            {
+                if (statusCode.Value == 404)
+                {
+                    var viewName = statusCode.ToString();
+                    return View(viewName);
+                }
+            }
             return View(statusCode);
         }
     }

BTCPayServer/Views/Error/404.cshtml

@@ -0,0 +1,15 @@
+@{
+    ViewData["ErrorTitle"] = "404 - Page not found";
+}
+
+<p class="lead-login">
+    This is like searching for person more beautiful than <a href="https://twitter.com/NicolasDorier" target="_blank">Nicolas Dorier</a>.
+    <br /><br />
+    <a href="https://twitter.com/NicolasDorier" target="_blank">
+        <img src="~/img/errorpages/404_nicolas.jpg" alt="Nicolas Dorier beauty" title="Slowly stroke the image" />
+    </a>
+    <br /><br />
+    It doesn't exist.
+    <br /><br />
+    You can always try <a href="/">navigating back to home</a>.
+</p>