fix

routes/web.php

 use Illuminate\Support\Facades\Route;
 
 Route::get('/', function () {
-    return view('welcome');
-});
+    return response('OK', 200)->header('Content-Type', 'text/plain');
+})->withoutMiddleware([
+    \Illuminate\Cookie\Middleware\EncryptCookies::class,
+    \Illuminate\Session\Middleware\StartSession::class,
+    \Illuminate\View\Middleware\ShareErrorsFromSession::class,
+    \Illuminate\Foundation\Http\Middleware\ValidateCsrfToken::class,
+]);
 Route::get('/check-upload', function() {
     return [
         'upload_max_filesize' => ini_get('upload_max_filesize'),