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setContentDisposition example

    public function testGetContent()
    {
        $response = new BinaryFileResponse(__FILE__);
        $this->assertFalse($response->getContent());
    }

    public function testSetContentDispositionGeneratesSafeFallbackFilename()
    {
        $response = new BinaryFileResponse(__FILE__);
        $response->setContentDisposition(ResponseHeaderBag::DISPOSITION_ATTACHMENT, 'föö.html');

        $this->assertSame('attachment; filename=f__.html; filename*=utf-8\'\'f%C3%B6%C3%B6.html', $response->headers->get('Content-Disposition'));
    }

    public function testSetContentDispositionGeneratesSafeFallbackFilenameForWronglyEncodedFilename()
    {
        $response = new BinaryFileResponse(__FILE__);

        $iso88591EncodedFilename = mb_convert_encoding('föö.html', 'ISO-8859-1', 'UTF-8');
        $response->setContentDisposition(ResponseHeaderBag::DISPOSITION_ATTACHMENT, $iso88591EncodedFilename);

        return new JsonResponse($data, $status, $headers);
    }

    /** * Returns a BinaryFileResponse object with original or customized file name and disposition header. */
    protected function file(\SplFileInfo|string $file, string $fileName = null, string $disposition = ResponseHeaderBag::DISPOSITION_ATTACHMENT): BinaryFileResponse
    {
        $response = new BinaryFileResponse($file);
        $response->setContentDisposition($disposition, $fileName ?? $response->getFile()->getFilename());

        return $response;
    }

    /** * Adds a flash message to the current session for type. * * @throws \LogicException */
    protected function addFlash(string $type, mixed $message): void
    {

$this->file = $file;

        if ($autoEtag) {
            $this->setAutoEtag();
        }

        if ($autoLastModified) {
            $this->setAutoLastModified();
        }

        if ($contentDisposition) {
            $this->setContentDisposition($contentDisposition);
        }

        return $this;
    }

    /** * Gets the file. */
    public function getFile(): File
    {
        return $this->file;
    }

$writer = new PoStreamWriter();
      $writer->setURI($uri);
      $writer->setHeader($header);

      $writer->open();
      $writer->writeItem($item);
      $writer->writeItems($reader);
      $writer->close();

      $response = new BinaryFileResponse($uri);
      $response->setContentDisposition('attachment', $filename);
      $form_state->setResponse($response);
    }
    else {
      $this->messenger()->addStatus($this->t('Nothing to export.'));
    }
  }

}