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        $controller = $observer->getEvent()->getControllerAction();
        $controller->getResponse()->setRedirect($redirectUrl);
        $controller->setFlag('', Mage_Core_Controller_Varien_Action::FLAG_NO_DISPATCH, true);
        $controller->setFlag('', Mage_Core_Controller_Varien_Action::FLAG_NO_POST_DISPATCH, true);

$controller = $observer->getEvent()->getControllerAction(); $controller->getResponse()->setRedirect($redirectUrl); $controller->setFlag('', Mage_Core_Controller_Varien_Action::FLAG_NO_DISPATCH, true); $controller->setFlag('', Mage_Core_Controller_Varien_Action::FLAG_NO_POST_DISPATCH, true);