CacheIdentifierPlugin.php

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<?php
namespace Magento\PageCache\Model\App;

class CacheIdentifierPlugin
{
    public function __construct(
        \Magento\Framework\View\DesignExceptions $designExceptions,
        \Magento\Framework\App\RequestInterface $request,
        \Magento\PageCache\Model\Config $config
    ) {
        $this->designExceptions = $designExceptions;
        $this->request = $request;
        $this->config = $config;
    }

    public function afterGetValue(\Magento\Framework\App\PageCache\Identifier $identifier, $result)
    {
        if ($this->config->getType() == \Magento\PageCache\Model\Config::BUILT_IN && $this->config->isEnabled()) {
            $ruleDesignException = $this->designExceptions->getThemeByRequest($this->request);
            if ($ruleDesignException !== false) {
                return $ruleDesignException . $result;
            }
        }
        return $result;
    }
}