HttpPlugin.php

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

class HttpPlugin
{
    public function beforeSendResponse(\Magento\Framework\App\Response\Http $subject)
    {
        if ($subject instanceof \Magento\Framework\App\PageCache\NotCacheableInterface) {
            return;
        }
        $subject->sendVary();
    }
}