Index.php

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<?php
namespace Magento\Rss\Controller\Adminhtml\Feed;

use Magento\Framework\Exception\NotFoundException;

class Index extends \Magento\Rss\Controller\Adminhtml\Feed
{
    public function execute()
    {
        if (!$this->scopeConfig->getValue('rss/config/active', \Magento\Store\Model\ScopeInterface::SCOPE_STORE)) {
            throw new NotFoundException(__('Page not found.'));
        }

        $type = $this->getRequest()->getParam('type');
        try {
            $provider = $this->rssManager->getProvider($type);
        } catch (\InvalidArgumentException $e) {
            throw new NotFoundException(__($e->getMessage()));
        }

        if (!$provider->isAllowed()) {
            throw new NotFoundException(__('Page not found.'));
        }

        $rss = $this->rssFactory->create();
        $rss->setDataProvider($provider);

        $this->getResponse()->setHeader('Content-type', 'text/xml; charset=UTF-8');
        $this->getResponse()->setBody($rss->createRssXml());
    }
}