Sending Strings as Files with CakePHP server response

With CakePHP it is quite easy to send any string as a subfile. As an example below is the creation of an ICS subfile (for a calendar invites)

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public function sendIcs()
{
  $icsString = $this->Calendars->generateIcs();
  $response = $this->response;

  // Inject string content into response body
  $response = $response->withStringBody($icsString);

  $response = $response->withType('ics');

  // Optionally force file download
  $response = $response->withDownload('filename_for_download.ics');

  // Return response object to prevent controller from trying to render
  // a view.
  return $response;
}

Example above is from official CakePHP book.