Server.php

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

use Magento\Framework\UrlInterface;
use Magento\Framework\App\DeploymentConfig;
use Magento\Framework\Config\ConfigOptionsListConstants;
use Magento\Framework\App\RequestInterface;
use Zend\Uri\Uri;
use Zend\Uri\UriFactory;

class Server
{
    protected $urlBuilder;

    private $config;

    private $request;

    const DEFAULT_PORT = 80;

    public function __construct(
        UrlInterface $urlBuilder,
        DeploymentConfig $config,
        RequestInterface $request
    ) {
        $this->urlBuilder = $urlBuilder;
        $this->config = $config;
        $this->request = $request;
    }

    public function getUris()
    {
        $servers = [];
        $configuredHosts = $this->config->get(ConfigOptionsListConstants::CONFIG_PATH_CACHE_HOSTS);

        if (is_array($configuredHosts)) {
            foreach ($configuredHosts as $host) {
                $servers[] = UriFactory::factory('')
                    ->setHost($host['host'])
                    ->setPort(isset($host['port']) ? $host['port'] : self::DEFAULT_PORT)
                ;
            }
        } elseif ($this->request->getHttpHost()) {
            $servers[] = UriFactory::factory('')->setHost($this->request->getHttpHost())->setPort(self::DEFAULT_PORT);
        } else {
            $servers[] = UriFactory::factory($this->urlBuilder->getUrl('*', ['_nosid' => true]));
        }

        foreach (array_keys($servers) as $key) {
            $servers[$key]->setScheme('http')
                ->setPath('/')
                ->setQuery(null);
        }
        return $servers;
    }
}