Refactor error handling. Add 404 page

Website/Controllers/ErrorController.cs

@@ -0,0 +1,27 @@
+using System;
+using System.Diagnostics;
+using Microsoft.AspNetCore.Mvc;
+using Website.ViewModels;
+
+namespace Website.Controllers
+{
+	public class ErrorController : Controller
+	{
+
+		public IActionResult BlowUp() {
+			throw new Exception();
+		}
+
+		[ResponseCache(Duration = 0, Location = ResponseCacheLocation.None, NoStore = true)]
+		public IActionResult ServerError()
+		{
+			return View(new ErrorViewModel { RequestId = Activity.Current?.Id ?? HttpContext.TraceIdentifier });
+		}
+
+		[ResponseCache(Duration = 0, Location = ResponseCacheLocation.None, NoStore = true)]
+		public IActionResult PageNotFound()
+		{
+			return View();
+		}
+	}
+}

Website/Controllers/HomeController.cs

@@ -1,7 +1,4 @@
-using System;
-using System.Collections.Generic;
-using System.Diagnostics;
-using System.Linq;
+using System.Diagnostics;
 using System.Threading.Tasks;
 using Microsoft.AspNetCore.Mvc;
 using Website.Data;
@@ -23,11 +20,5 @@ namespace Website.Controllers
 			var post = await _blogRepo.GetLatestPostAsync();
 			return View(post);
 		}
-
-		[ResponseCache(Duration = 0, Location = ResponseCacheLocation.None, NoStore = true)]
-		public IActionResult Error()
-		{
-			return View(new ErrorViewModel { RequestId = Activity.Current?.Id ?? HttpContext.TraceIdentifier });
-		}
 	}
 }

Website/Startup.cs

@@ -1,11 +1,6 @@
-using System;
-using System.Collections.Generic;
-using System.Linq;
-using System.Threading.Tasks;
-using Microsoft.AspNetCore.Builder;
+using Microsoft.AspNetCore.Builder;
 using Microsoft.AspNetCore.Hosting;
 using Microsoft.AspNetCore.Http;
-using Microsoft.AspNetCore.HttpsPolicy;
 using Microsoft.AspNetCore.Mvc;
 using Microsoft.Extensions.Configuration;
 using Microsoft.Extensions.DependencyInjection;
@@ -51,7 +46,8 @@ namespace Website
 			}
 			else
 			{
-				app.UseExceptionHandler("/Home/Error");
+				app.UseExceptionHandler("/Error/ServerError");
+				app.UseStatusCodePagesWithReExecute("/Error/PageNotFound");
 				// The default HSTS value is 30 days. You may want to change this for production scenarios, see https://aka.ms/aspnetcore-hsts.
 				app.UseHsts();
 			}

Website/Views/Error/PageNotFound.cshtml

@@ -0,0 +1,7 @@
+@model ErrorViewModel
+@{
+	ViewData["Title"] = "404 Not Found";
+}
+
+<h1>404 Not Found - page unavailable.</h1>
+This page cannot be found.