core-bundle/src/Resources/contao/classes/FrontendTemplate.php
public function getResponse($blnCheckRequest=false)
	{
		$this->blnCheckRequest = $blnCheckRequest;

		return $this->setCacheHeaders(parent::getResponse());
	}
public function getResponse($blnCheckRequest=false)
	{
		$this->blnCheckRequest = $blnCheckRequest;

		return $this->setCacheHeaders(parent::getResponse());
	}
Return a response object

@param bool $blnCheckRequest If true, check for unsued $_GET parameters

@return Response The response object