Quick tutorial on how to serve a PDF that downloads automatically in your browser in drupal 8.

<?php
namespace Drupal\MYMODULE\Controller;

use Drupal\Core\Controller\ControllerBase;
use Symfony\Component\HttpFoundation\BinaryFileResponse;

/**
 * Class PdfGeneratorController.
 */
class PdfGeneratorController extends ControllerBase {

  public function Render($uuid) {

    // In my case, I render a file by UUID
    // This actually does not matter too much here
    // String below contains the url of the file
    $uri = 'private://'.$uuid.'.pdf';

    $headers = array(
      'Content-Type'     => 'application/pdf',
      'Content-Disposition' => 'attachment;filename="download"');

    return new BinaryFileResponse($uri, 200, $headers, true);
  }
}

So if i put a link like '/download/550e8400-e29b-41d4-a716-446655440000', then it would automatically download my PDF file in my browser. Inside the controller you could generate the pdf, or check if it exists, ... before you serve the download. Enjoy!


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