State.php

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<?php
namespace Magento\Config\Controller\Adminhtml\System\Config;

use Magento\Framework\App\Action\HttpGetActionInterface;
use Magento\Framework\App\Action\HttpPostActionInterface;

class State extends AbstractScopeConfig implements HttpPostActionInterface, HttpGetActionInterface
{
    protected $resultRawFactory;

    public function __construct(
        \Magento\Backend\App\Action\Context $context,
        \Magento\Config\Model\Config\Structure $configStructure,
        \Magento\Config\Controller\Adminhtml\System\ConfigSectionChecker $sectionChecker,
        \Magento\Config\Model\Config $backendConfig,
        \Magento\Framework\Controller\Result\RawFactory $resultRawFactory
    ) {
        parent::__construct($context, $configStructure, $sectionChecker, $backendConfig);
        $this->resultRawFactory = $resultRawFactory;
    }

    public function execute()
    {
        if ($this->getRequest()->getParam('isAjax')
            && $this->getRequest()->getParam('container') != ''
            && $this->getRequest()->getParam('value') != ''
        ) {
            $configState = [$this->getRequest()->getParam('container') => $this->getRequest()->getParam('value')];
            $this->_saveState($configState);
            $resultRaw = $this->resultRawFactory->create();
            return $resultRaw->setContents('success');
        }
    }
}