Index.php

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<?php
namespace Magento\Cms\Controller\Noroute;

class Index extends \Magento\Framework\App\Action\Action
{
    protected $resultForwardFactory;

    public function __construct(
        \Magento\Framework\App\Action\Context $context,
        \Magento\Framework\Controller\Result\ForwardFactory $resultForwardFactory
    ) {
        $this->resultForwardFactory = $resultForwardFactory;
        parent::__construct($context);
    }

    public function execute()
    {
        $pageId = $this->_objectManager->get(
            \Magento\Framework\App\Config\ScopeConfigInterface::class,
            \Magento\Store\Model\ScopeInterface::SCOPE_STORE
        )->getValue(
            \Magento\Cms\Helper\Page::XML_PATH_NO_ROUTE_PAGE,
            \Magento\Store\Model\ScopeInterface::SCOPE_STORE
        );
        $pageHelper = $this->_objectManager->get(\Magento\Cms\Helper\Page::class);
        $resultPage = $pageHelper->prepareResultPage($this, $pageId);
        if ($resultPage) {
            $resultPage->setStatusHeader(404, '1.1', 'Not Found');
            $resultPage->setHeader('Status', '404 File not found');
            return $resultPage;
        } else {
            $resultForward = $this->resultForwardFactory->create();
            $resultForward->setController('index');
            $resultForward->forward('defaultNoRoute');
            return $resultForward;
        }
    }
}