Breaking: #96968 - Hook "headerNoCache" removed

See forge#96968


The previous TYPO3 Hook "headerNoCache" registered via $GLOBALS['TYPO3_CONF_VARS']['SC_OPTIONS']['tslib/class.tslib_fe.php']['headerNoCache'] has been removed in favor of a new PSR-14 event ShouldUseCachedPageDataIfAvailableEvent.


Hooks in third-party extensions will not be executed anymore.

Affected Installations

TYPO3 installations with custom extensions using this hook.


Register a new PSR-14 event listener for ShouldUseCachedPageDataIfAvailableEvent in the extension's Services.yaml to keep TYPO3 v12+ compatibility.

Extensions can then provide compatibility with TYPO3 v11 and TYPO3 v12 at the same time.