diff --git a/GC-local-server-rewrite/common/Configs.cs b/GC-local-server-rewrite/common/Configs.cs
index 3ca1c3b..fbc94d6 100644
--- a/GC-local-server-rewrite/common/Configs.cs
+++ b/GC-local-server-rewrite/common/Configs.cs
@@ -36,6 +36,8 @@ public static class Configs
 
     public const string INCOM_SERVICE_BASE_ROUTE = "/service/incom";
 
+    public const string UPDATE_SERVICE_BASE_ROUTE = "/update/cgi";
+
     public const string RANK_BASE_ROUTE = "/ranking";
 
     public const string ALIVE_BASE_ROUTE = "/alive";
diff --git a/GC-local-server-rewrite/controllers/UpdateController.cs b/GC-local-server-rewrite/controllers/UpdateController.cs
new file mode 100644
index 0000000..b079421
--- /dev/null
+++ b/GC-local-server-rewrite/controllers/UpdateController.cs
@@ -0,0 +1,24 @@
+using EmbedIO;
+using EmbedIO.Routing;
+using EmbedIO.WebApi;
+using Swan.Logging;
+
+namespace GCLocalServerRewrite.controllers
+{
+    // TODO: Add proper update check response
+    public class UpdateController : WebApiController
+    {
+        [Route(HttpVerbs.Get, "/check.php")]
+        public string CheckUpdate()
+        {
+            var parameters = HttpContext.GetRequestQueryData();
+            foreach (var key in parameters.AllKeys)
+            {
+                $"Key {key}: {parameters[key]}".Info();
+            }
+            
+            HttpContext.Response.StatusCode = 404;
+            return "Not found";
+        }
+    }
+}
diff --git a/GC-local-server-rewrite/server/Server.cs b/GC-local-server-rewrite/server/Server.cs
index 1f652fc..0c7e84d 100644
--- a/GC-local-server-rewrite/server/Server.cs
+++ b/GC-local-server-rewrite/server/Server.cs
@@ -41,6 +41,8 @@ public class Server
                 module => module.WithController<ServerController>())
             .WithWebApi(Configs.RANK_BASE_ROUTE, CustomResponseSerializer.None(true),
                 module => module.WithController<RankController>())
+            .WithWebApi(Configs.UPDATE_SERVICE_BASE_ROUTE, CustomResponseSerializer.None(true),
+                module => module.WithController<UpdateController>())
             .WithStaticFolder(Configs.STATIC_BASE_ROUTE, PathHelper.HtmlRootPath, true, m => m
                 .WithContentCaching(Configs.USE_FILE_CACHE))
             // Add static files after other modules to avoid conflicts
@@ -62,7 +64,8 @@ public class Server
             switch (exception.StatusCode)
             {
                 case 404:
-                    await context.SendStringAsync("404 NOT FOUND!", "text/html", new UTF8Encoding(false));
+                    var htmlContents = await File.ReadAllTextAsync(Path.Combine(PathHelper.HtmlRootPath, "index.html"));
+                    await context.SendStringAsync(htmlContents, "text/html", Encoding.UTF8);
 
                     break;
                 default: