Index.php

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

use Magento\Framework\App\Action\HttpPostActionInterface;
use Magento\Framework\App\Action\HttpGetActionInterface;
use Magento\Framework\App\Action\Context;
use Magento\Framework\App\Config\ScopeConfigInterface;
use Magento\Framework\App\ObjectManager;
use Magento\Framework\App\ResponseInterface;
use Magento\Framework\Controller\ResultInterface;
use Magento\Framework\Controller\Result\Forward;
use Magento\Framework\Controller\Result\ForwardFactory;
use Magento\Framework\View\Result\Page as ResultPage;
use Magento\Cms\Helper\Page;
use Magento\Store\Model\ScopeInterface;
use Magento\Framework\App\Action\Action;

class Index extends Action implements HttpGetActionInterface, HttpPostActionInterface
{
    protected $resultForwardFactory;

    private $scopeConfig;

    private $page;

    public function __construct(
        Context $context,
        ForwardFactory $resultForwardFactory,
        ScopeConfigInterface $scopeConfig = null,
        Page $page = null
    ) {
        $this->resultForwardFactory = $resultForwardFactory;
        $this->scopeConfig = $scopeConfig ? : ObjectManager::getInstance()->get(ScopeConfigInterface::class);
        $this->page = $page ? : ObjectManager::getInstance()->get(Page::class);
        parent::__construct($context);
    }

    public function execute($coreRoute = null)
    {
        $pageId = $this->scopeConfig->getValue(Page::XML_PATH_HOME_PAGE, ScopeInterface::SCOPE_STORE);
        $resultPage = $this->page->prepareResultPage($this, $pageId);
        if (!$resultPage) {
            $resultForward = $this->resultForwardFactory->create();
            $resultForward->forward('defaultIndex');
            return $resultForward;
        }
        return $resultPage;
    }
}