public function getFeed(HTTPRequest $request)
    {
        $link = $this->Link('rss');
        $class = $this->decodeClassName($request->param('ID'));
        $id = $request->param('OtherID');

        // Support old pageid param
        if (!$id && !$class && ($id = $request->getVar('pageid'))) {
            $class = SiteTree::class;
        }

        $comments = Comment::get()->filter([
            'Moderated' => 1,
            'IsSpam' => 0,
        ]);

        // Check if class filter
        if ($class) {
            if (!is_subclass_of($class, DataObject::class) || !$class::has_extension(CommentsExtension::class)) {
                return $this->httpError(404);
            }
            $this->setParentClass($class);
            $comments = $comments->filter('ParentClass', $class);
            $link = Controller::join_links($link, $this->encodeClassName($class));

            // Check if id filter
            if ($id) {
                $comments = $comments->filter('ParentID', $id);
                $link = Controller::join_links($link, $id);
                $this->setOwnerRecord(DataObject::get_by_id($class, $id));
            }
        }

        $title = _t(__CLASS__ . '.RSSTITLE', "Comments RSS Feed");
        $comments = PaginatedList::create($comments, $request);
        $comments->setPageLength($this->getOption('comments_per_page'));

        return RSSFeed::create(
            $comments,
            $link,
            $title,
            $link,
            'Title',
            'EscapedComment',
            'AuthorName'
        );
    }