setCachedHeaders method
Implementation
void setCachedHeaders(
DateTime modified, RequestContext req, ResponseContext res) {
var privacy = accessLevelToString(accessLevel);
res.headers
..['cache-control'] = '$privacy, max-age=$maxAge'
..['last-modified'] = HttpDate.format(modified);
//if (maxAge != null) {
var expiry = DateTime.now().add(Duration(seconds: maxAge));
res.headers['expires'] = HttpDate.format(expiry);
//}
}