Index.php

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<?php
namespace Magento\Checkout\Controller\ShippingRates;

use Magento\Framework\App\Action;
use Magento\Framework\App\Action\Context;
use Magento\Framework\App\RequestInterface;
use Magento\Framework\App\ResponseInterface;

class Index extends \Magento\Framework\App\Action\Action
{
    protected $result;

    protected $checkoutSession;

    public function __construct(
        Context $context,
        \Magento\Checkout\Model\Session $session
    ) {
        $this->checkoutSession = $session;
        parent::__construct($context);
    }

    public function execute()
    {
        $quote = $this->checkoutSession->getQuote();
        $address = $quote->getShippingAddress();
        $address->collectShippingRates()->save();
        $rates = $address->getGroupedAllShippingRates();
        $result = $this->resultFactory->create(\Magento\Framework\Controller\ResultFactory::TYPE_JSON);
        $result->setData($rates);
        return $result;
    }
}