protected static function getRequestWithReValidationHeader(RequestInterface $request, CacheEntry $cacheEntry)
{
if ($cacheEntry->getResponse()->hasHeader('Last-Modified')) {
$request = $request->withHeader('If-Modified-Since', $cacheEntry->getResponse()->getHeader('Last-Modified'));
}
if ($cacheEntry->getResponse()->hasHeader('Etag')) {
$request = $request->withHeader('If-None-Match', $cacheEntry->getResponse()->getHeader('Etag'));
}
return $request;
}