ob_start();
Action::factory( 'history', $article, $context )->show();
$context->getOutput()->output();
$context->getOutput()->clearHTML();
$historyHtml = ob_get_clean();
$historyCache->saveToFileCache( $historyHtml );
ob_start();
Action::factory( 'history', $article, $context )->show();
$context->getOutput()->output();
$context->getOutput()->clearHTML();
$historyHtml = ob_get_clean();
$historyCache->saveToFileCache( $historyHtml );