AjaxLoad.php

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<?php
namespace Magento\Tax\Controller\Adminhtml\Rate;

use Magento\Framework\Exception\NoSuchEntityException;
use Magento\Framework\Controller\ResultFactory;

class AjaxLoad extends \Magento\Tax\Controller\Adminhtml\Rate
{
    public function execute()
    {
        $rateId = (int)$this->getRequest()->getParam('id');
        try {
            /* @var \Magento\Tax\Api\Data\TaxRateInterface */
            $taxRateDataObject = $this->_taxRateRepository->get($rateId);
            /* @var array */
            $resultArray = $this->_taxRateConverter->createArrayFromServiceObject($taxRateDataObject, true);

            $responseContent = [
                'success' => true,
                'error_message' => '',
                'result' => $resultArray,
            ];
        } catch (NoSuchEntityException $e) {
            $responseContent = [
                'success' => false,
                'error_message' => $e->getMessage(),
            ];
        } catch (\Exception $e) {
            $responseContent = [
                'success' => false,
                'error_message' => __('An error occurred while loading this tax rate.'),
            ];
        }

        $resultJson = $this->resultFactory->create(ResultFactory::TYPE_JSON);
        $resultJson->setData($responseContent);
        return $resultJson;
    }
}