/**
* @param $response Psr\Http\Message\ResponseInterface
* @param mixed $content Content to return as response body
*
* @return Psr\Http\Message\ResponseInterface
*/
protected function withBody($response, $content = null)
{
$body = $response->getBody();
if ($content == null) {
$content = $this->template->toString();
}
$body->write($content);
$response = $response->withBody($body);
return $response;
}
