PostHelper.php

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<?php
namespace Magento\Framework\Data\Helper;

use Magento\Framework\App\Helper\Context;
use Magento\Framework\Url\Helper\Data as UrlHelper;

class PostHelper extends \Magento\Framework\App\Helper\AbstractHelper
{
    private $urlHelper;

    public function __construct(
        Context $context,
        UrlHelper $urlHelper
    ) {
        parent::__construct($context);
        $this->urlHelper = $urlHelper;
    }

    public function getPostData($url, array $data = [])
    {
        if (!isset($data[\Magento\Framework\App\ActionInterface::PARAM_NAME_URL_ENCODED])) {
            $data[\Magento\Framework\App\ActionInterface::PARAM_NAME_URL_ENCODED] = $this->urlHelper->getEncodedUrl();
        }
        return json_encode(['action' => $url, 'data' => $data]);
    }
}