Block.php

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<?php
namespace Magento\PageCache\Controller;

use Magento\Framework\Serialize\Serializer\Base64Json;
use Magento\Framework\Serialize\Serializer\Json;
use Magento\Framework\View\Layout\LayoutCacheKeyInterface;

abstract class Block extends \Magento\Framework\App\Action\Action
{
    protected $translateInline;

    private $jsonSerializer;

    private $base64jsonSerializer;

    private $layoutCacheKey;

    private $layoutCacheKeyName = 'mage_pagecache';

    public function __construct(
        \Magento\Framework\App\Action\Context $context,
        \Magento\Framework\Translate\InlineInterface $translateInline,
        Json $jsonSerializer = null,
        Base64Json $base64jsonSerializer = null,
        LayoutCacheKeyInterface $layoutCacheKey = null
    ) {
        parent::__construct($context);
        $this->translateInline = $translateInline;
        $this->jsonSerializer = $jsonSerializer
            ?: \Magento\Framework\App\ObjectManager::getInstance()->get(Json::class);
        $this->base64jsonSerializer = $base64jsonSerializer
            ?: \Magento\Framework\App\ObjectManager::getInstance()->get(Base64Json::class);
        $this->layoutCacheKey = $layoutCacheKey
            ?: \Magento\Framework\App\ObjectManager::getInstance()->get(LayoutCacheKeyInterface::class);
    }

    protected function _getBlocks()
    {
        $blocks = $this->getRequest()->getParam('blocks', '');
        $handles = $this->getRequest()->getParam('handles', '');

        if (!$handles || !$blocks) {
            return [];
        }
        $blocks = $this->jsonSerializer->unserialize($blocks);
        $handles = $this->base64jsonSerializer->unserialize($handles);

        $layout = $this->_view->getLayout();
        $this->layoutCacheKey->addCacheKeys($this->layoutCacheKeyName);

        $this->_view->loadLayout($handles, true, true, false);
        $data = [];

        foreach ($blocks as $blockName) {
            $blockInstance = $layout->getBlock($blockName);
            if (is_object($blockInstance)) {
                $data[$blockName] = $blockInstance;
            }
        }

        return $data;
    }
}