core-bundle/src/Resources/contao/classes/FrontendTemplate.php
private function setCacheHeaders(Response $response)
	{
		/** @var PageModel $objPage */
		global $objPage;

		if (($objPage->cache === false || $objPage->cache < 1) && ($objPage->clientCache === false || $objPage->clientCache < 1))
		{
			$response->headers->addCacheControlDirective('no-cache');
			$response->headers->addCacheControlDirective('no-store');

			return $response->setPrivate();
		}

		// Do not cache the response if a user is logged in or the page is protected
		// TODO: Add support for proxies so they can vary on member context
		if (FE_USER_LOGGED_IN === true || BE_USER_LOGGED_IN === true || $objPage->protected || $this->hasAuthenticatedBackendUser())
		{
			$response->headers->addCacheControlDirective('no-cache');
			$response->headers->addCacheControlDirective('no-store');

			return $response->setPrivate();
		}

		if ($objPage->clientCache > 0)
		{
			$response->setMaxAge($objPage->clientCache);
		}

		if ($objPage->cache > 0)
		{
			$response->setSharedMaxAge($objPage->cache);
		}

		// Tag the response
		if (System::getContainer()->has('fos_http_cache.http.symfony_response_tagger'))
		{
			/** @var ResponseTagger $responseTagger */
			$responseTagger = System::getContainer()->get('fos_http_cache.http.symfony_response_tagger');
			$responseTagger->addTags(array('contao.db.tl_page.' . $objPage->id));
		}

		return $response;
	}
private function setCacheHeaders(Response $response)
	{
		/** @var PageModel $objPage */
		global $objPage;

		if (($objPage->cache === false || $objPage->cache < 1) && ($objPage->clientCache === false || $objPage->clientCache < 1))
		{
			$response->headers->addCacheControlDirective('no-cache');
			$response->headers->addCacheControlDirective('no-store');

			return $response->setPrivate();
		}

		// Do not cache the response if a user is logged in or the page is protected
		// TODO: Add support for proxies so they can vary on member context
		if (FE_USER_LOGGED_IN === true || BE_USER_LOGGED_IN === true || $objPage->protected || $this->hasAuthenticatedBackendUser())
		{
			$response->headers->addCacheControlDirective('no-cache');
			$response->headers->addCacheControlDirective('no-store');

			return $response->setPrivate();
		}

		if ($objPage->clientCache > 0)
		{
			$response->setMaxAge($objPage->clientCache);
		}

		if ($objPage->cache > 0)
		{
			$response->setSharedMaxAge($objPage->cache);
		}

		// Tag the response
		if (System::getContainer()->has('fos_http_cache.http.symfony_response_tagger'))
		{
			/** @var ResponseTagger $responseTagger */
			$responseTagger = System::getContainer()->get('fos_http_cache.http.symfony_response_tagger');
			$responseTagger->addTags(array('contao.db.tl_page.' . $objPage->id));
		}

		return $response;
	}
Set the cache headers according to the page settings.

@param Response $response The response object

@return Response The response object