Cart.php

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<?php
namespace Magento\Checkout\Controller;

use Magento\Catalog\Controller\Product\View\ViewInterface;
use Magento\Checkout\Model\Cart as CustomerCart;

abstract class Cart extends \Magento\Framework\App\Action\Action implements ViewInterface
{
    protected $_scopeConfig;

    protected $_checkoutSession;

    protected $_storeManager;

    protected $_formKeyValidator;

    protected $cart;

    public function __construct(
        \Magento\Framework\App\Action\Context $context,
        \Magento\Framework\App\Config\ScopeConfigInterface $scopeConfig,
        \Magento\Checkout\Model\Session $checkoutSession,
        \Magento\Store\Model\StoreManagerInterface $storeManager,
        \Magento\Framework\Data\Form\FormKey\Validator $formKeyValidator,
        CustomerCart $cart
    ) {
        $this->_formKeyValidator = $formKeyValidator;
        $this->_scopeConfig = $scopeConfig;
        $this->_checkoutSession = $checkoutSession;
        $this->_storeManager = $storeManager;
        $this->cart = $cart;
        parent::__construct($context);
    }

    protected function _goBack($backUrl = null)
    {
        $resultRedirect = $this->resultRedirectFactory->create();

        if ($backUrl || $backUrl = $this->getBackUrl($this->_redirect->getRefererUrl())) {
            $resultRedirect->setUrl($backUrl);
        }

        return $resultRedirect;
    }

    protected function _isInternalUrl($url)
    {
        if (strpos($url, 'http') === false) {
            return false;
        }

        $store = $this->_storeManager->getStore();
        $unsecure = strpos($url, $store->getBaseUrl()) === 0;
        $secure = strpos($url, $store->getBaseUrl(\Magento\Framework\UrlInterface::URL_TYPE_LINK, true)) === 0;
        return $unsecure || $secure;
    }

    protected function getBackUrl($defaultUrl = null)
    {
        $returnUrl = $this->getRequest()->getParam('return_url');
        if ($returnUrl && $this->_isInternalUrl($returnUrl)) {
            $this->messageManager->getMessages()->clear();
            return $returnUrl;
        }

        if ($this->shouldRedirectToCart() || $this->getRequest()->getParam('in_cart')) {
            if ($this->getRequest()->getActionName() == 'add' && !$this->getRequest()->getParam('in_cart')) {
                $this->_checkoutSession->setContinueShoppingUrl($this->_redirect->getRefererUrl());
            }
            return $this->_url->getUrl('checkout/cart');
        }

        return $defaultUrl;
    }

    private function shouldRedirectToCart()
    {
        return $this->_scopeConfig->isSetFlag(
            'checkout/cart/redirect_to_cart',
            \Magento\Store\Model\ScopeInterface::SCOPE_STORE
        );
    }
}