Load.php

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<?php
namespace Magento\Customer\Controller\Section;

use Magento\Framework\App\Action\HttpGetActionInterface as HttpGetActionInterface;
use Magento\Customer\CustomerData\Section\Identifier;
use Magento\Customer\CustomerData\SectionPoolInterface;
use Magento\Framework\App\Action\Context;
use Magento\Framework\Controller\Result\JsonFactory;

class Load extends \Magento\Framework\App\Action\Action implements HttpGetActionInterface
{
    protected $resultJsonFactory;

    protected $sectionIdentifier;

    protected $sectionPool;

    private $escaper;

    public function __construct(
        Context $context,
        JsonFactory $resultJsonFactory,
        Identifier $sectionIdentifier,
        SectionPoolInterface $sectionPool,
        \Magento\Framework\Escaper $escaper = null
    ) {
        parent::__construct($context);
        $this->resultJsonFactory = $resultJsonFactory;
        $this->sectionIdentifier = $sectionIdentifier;
        $this->sectionPool = $sectionPool;
        $this->escaper = $escaper ?: $this->_objectManager->get(\Magento\Framework\Escaper::class);
    }

    public function execute()
    {
        $resultJson = $this->resultJsonFactory->create();
        $resultJson->setHeader('Cache-Control', 'max-age=0, must-revalidate, no-cache, no-store', true);
        $resultJson->setHeader('Pragma', 'no-cache', true);
        try {
            $sectionNames = $this->getRequest()->getParam('sections');
            $sectionNames = $sectionNames ? array_unique(\explode(',', $sectionNames)) : null;

            $updateSectionId = $this->getRequest()->getParam('update_section_id');
            if ('false' === $updateSectionId) {
                $updateSectionId = false;
            }
            $response = $this->sectionPool->getSectionsData($sectionNames, (bool)$updateSectionId);
        } catch (\Exception $e) {
            $resultJson->setStatusHeader(
                \Zend\Http\Response::STATUS_CODE_400,
                \Zend\Http\AbstractMessage::VERSION_11,
                'Bad Request'
            );
            $response = ['message' => $this->escaper->escapeHtml($e->getMessage())];
        }

        return $resultJson->setData($response);
    }
}