php__symfony__book/src/Controller/StreamingController.php

<?php

namespace App\Controller;


use Symfony\Bundle\FrameworkBundle\Controller\AbstractController;
use Symfony\Component\HttpFoundation\ResponseHeaderBag;
use Symfony\Component\Routing\Annotation\Route;

class StreamingController extends AbstractController {

  /**
   * @return \Symfony\Component\HttpFoundation\BinaryFileResponse
   *
   * @Route(
   *   name = "pass",
   *   path = "/pass"
   * )
   */
  public function pass() {
    $response = $this->file('/etc/passwd', 'blougou', ResponseHeaderBag::DISPOSITION_INLINE);

    // Defaults to 'attachment; filename="${basename($file)}"'. When not using
    // the 2nd and 3rd arguments:
    // $response->headers->set('Content-disposition', 'inline');

    return $response;
  }
}