Render.php

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<?php
namespace Magento\PageCache\Controller\Block;

class Render extends \Magento\PageCache\Controller\Block
{
    public function execute()
    {
        if (!$this->getRequest()->isAjax()) {
            $this->_forward('noroute');
            return;
        }
        // disable profiling during private content handling AJAX call
        \Magento\Framework\Profiler::reset();
        $currentRoute = $this->getRequest()->getRouteName();
        $currentControllerName = $this->getRequest()->getControllerName();
        $currentActionName = $this->getRequest()->getActionName();
        $currentRequestUri = $this->getRequest()->getRequestUri();

        $origRequest = $this->getRequest()->getParam('originalRequest');
        if ($origRequest && is_string($origRequest)) {
            $origRequest = json_decode($origRequest, true);
        }
        $this->getRequest()->setRouteName($origRequest['route']);
        $this->getRequest()->setControllerName($origRequest['controller']);
        $this->getRequest()->setActionName($origRequest['action']);
        $this->getRequest()->setRequestUri($origRequest['uri']);

        $blocks = $this->_getBlocks();
        $data = [];

        foreach ($blocks as $blockName => $blockInstance) {
            $data[$blockName] = $blockInstance->toHtml();
        }

        $this->getRequest()->setRouteName($currentRoute);
        $this->getRequest()->setControllerName($currentControllerName);
        $this->getRequest()->setActionName($currentActionName);
        $this->getRequest()->setRequestUri($currentRequestUri);

        $this->getResponse()->setPrivateHeaders(\Magento\PageCache\Helper\Data::PRIVATE_MAX_AGE_CACHE);
        $this->translateInline->processResponseBody($data);
        $this->getResponse()->appendBody(json_encode($data));
    }
}