Deprecation: #86179 - Protected render() method in BackendController¶
See Issue #86179
TYPO3\CMS\Backend\Controller\BackendController->render() has changed visibility
from public to protected and should not be called any longer.
Calling the method from an external object triggers a PHP
This internal method is usually not called by extensions directly. Since the method name is so generic, the extension scanner is not configured to search for usages, it would trigger far too many false positives.
Use route target
main instead that calls method
mainAction and returns a
proper PSR-7 Response object.