php__silex__book/src/demo/Errors/HttpErrorHandler.php

<?php

namespace demo\Errors;


use Symfony\Component\HttpFoundation\Request;
use Symfony\Component\HttpFoundation\Response;
use Symfony\Component\HttpKernel\Exception\HttpException;

class HttpErrorHandler {
  // Error handlers receive exactly these arguments, in that order.
  public static function handle(HttpException $e, Request $request, $code) {
    $response = new Response("HTTP Error $code caught: skipping generic error handler.",
      // This status is ignored by Silex, which tries to ensure status code
      // consistency with the exception.
      Response::HTTP_NOT_FOUND,
      // But we can force it with this fake header, which is removed before
      // sending the response to the user agent.
      ['X-Status-Code' => Response::HTTP_OK]);
    return $response;
  }
}