LoadWizardView.php

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<?php
namespace TYPO3\CMS\Form\View\Wizard;

class LoadWizardView extends \TYPO3\CMS\Form\View\Wizard\AbstractWizardView {

    public function render() {
        $jsonObject = $this->repository->getRecordAsJson();
        $this->headerOutput($jsonObject);
    }

    protected function headerOutput($jsonObject) {
        if (!$jsonObject) {
            header('HTTP/1.1 500 Internal Server Error');
            $jsonArray = array('message' => 'Failed to save the form');
        } else {
            $jsonArray = array('configuration' => $jsonObject);
        }
        $json = json_encode($jsonArray);
        header('Expires: Mon, 26 Jul 1997 05:00:00 GMT');
        header('Last-Modified: ' . gmdate('D, d M Y H:i:s') . 'GMT');
        header('Cache-Control: no-cache, must-revalidate');
        header('Pragma: no-cache');
        header('Content-Length: ' . strlen($json));
        header('Content-Type: application/json; charset=utf-8');
        header('Content-Transfer-Encoding: 8bit');
        echo $json;
        die;
    }

}