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Frontend controller
The 
        frontend. frontend request attribute provides access to the
        \TYPO3\ object.
Example:
$frontendController = $request->getAttribute('frontend.controller');
$rootline = $frontendController->rootLine;  // Mind the capital "L"Important
In former TYPO3 versions you have to retrieve the
        Typo via the global variable
        $GLOBALS. This should be avoided now, instead use the request
attribute.