Generate specific error pages with Symfony2

404 and 500 errors

Symfony2 allows to customize error pages by overriding Twig templates as decribed here. You can override the Twig templates for a range of typical cases like :

• error.html.twig
• exception.html.twig
• error404.html.twig
• and various other formats

From the controller, you can render a 500 error template by calling :

throw new \Exception('There is something wrong');

Or for a 404 error :

throw $this->createNotFoundException('The product does not exist');

More customized errors

But if you want to render, let's say a 402 exception, you have to use :

// At the beginnig of the file
use Symfony\Component\HttpKernel\Exception\HttpExcetion;
// In the controller
throw new HttpException(402,'There is something wrong');

If you want to display this custom message in the template, you have to add :

// Code of the error
{{ status_code }} 
// Standard name of the error
{{ status_text }}
// Text you specified when throwing the exception
{{ exception.message|e|replace({"n": '<br/ >'})|format_file_from_text }}

Other resources

• List of standard HTTP error codes
• Symfony2 cookbook about error customization