Neos\Flow\Mvc\DispatchComponent::setDefaultControllerAndActionNameIfNoneSpecified PHP Method

    protected function setDefaultControllerAndActionNameIfNoneSpecified(ActionRequest $actionRequest)
    {
        if ($actionRequest->getControllerName() === null) {
            $actionRequest->setControllerName('Standard');
        }
        if ($actionRequest->getControllerActionName() === null) {
            $actionRequest->setControllerActionName('index');
        }
    }