Deprecation: #73352 - Deprecate old-school AJAX requests

See Issue #73352

Description

The class \TYPO3\CMS\Core\Http\AjaxRequestHandler and the associated methods ExtensionManagementUtility::registerAjaxHandler() and \TYPO3\CMS\Backend\Http\AjaxRequestHandler::dispatchTraditionalAjaxRequest() have been marked as deprecated and will be removed in TYPO3 v9.

Impact

Calling any of the methods will trigger a deprecation log entry.

Affected Installations

Any TYPO3 installation with a third-party extensions using the class \TYPO3\CMS\Core\Http\AjaxRequestHandler or calling any of the methods directly.

Migration

Use the Backend Ajax Routes logic instead.