Method getUpdateSiteResponse

/**
 * Try to get the raw HTTP response from the update site, hopefully containing the update XML.
 *
 * @param   array  $options  The update options, see findUpdate() in children classes
 *
 * @return  \Joomla\CMS\Http\Response|bool  False if we can't connect to the site, HTTP Response object otherwise
 *
 * @throws  \Exception
 */
protected function getUpdateSiteResponse($options = array())
{
    $url = trim($options['location']);
    $this->_url =& $url;
    $this->updateSiteId = $options['update_site_id'];
    if (!isset($options['update_site_name'])) {
        $options['update_site_name'] = $this->getUpdateSiteName($this->updateSiteId);
    }
    $this->updateSiteName = $options['update_site_name'];
    $this->appendExtension = false;
    if (\array_key_exists('append_extension', $options)) {
        $this->appendExtension = $options['append_extension'];
    }
    if ($this->appendExtension && substr($url, -4) !== '.xml') {
        if (substr($url, -1) !== '/') {
            $url .= '/';
        }
        $url .= 'extension.xml';
    }
    // Disable the update site. If the get() below fails with a fatal error (e.g. timeout) the faulty update
    // site will remain disabled
    $this->toggleUpdateSite($this->updateSiteId, false);
    $startTime = microtime(true);
    $version = new Version();
    $httpOption = new Registry();
    $httpOption->set('userAgent', $version->getUserAgent('Joomla', true, false));
    // JHttp transport throws an exception when there's no response.
    try {
        $http = HttpFactory::getHttp($httpOption);
        $response = $http->get($url, array(), 20);
    } catch (\RuntimeException $e) {
        $response = null;
    }
    // Enable the update site. Since the get() returned the update site should remain enabled
    $this->toggleUpdateSite($this->updateSiteId, true);
    // Log the time it took to load this update site's information
    $endTime = microtime(true);
    $timeToLoad = sprintf('%0.2f', $endTime - $startTime);
    Log::add("Loading information from update site #{$this->updateSiteId} with name " . "\"{$this->updateSiteName}\" and URL {$url} took {$timeToLoad} seconds", Log::INFO, 'updater');
    if ($response === null || $response->code !== 200) {
        // If the URL is missing the .xml extension, try appending it and retry loading the update
        if (!$this->appendExtension && substr($url, -4) !== '.xml') {
            $options['append_extension'] = true;
            return $this->getUpdateSiteResponse($options);
        }
        // Log the exact update site name and URL which could not be loaded
        Log::add('Error opening url: ' . $url . ' for update site: ' . $this->updateSiteName, Log::WARNING, 'updater');
        $app = Factory::getApplication();
        $app->enqueueMessage(Text::sprintf('JLIB_UPDATER_ERROR_OPEN_UPDATE_SITE', $this->updateSiteId, $this->updateSiteName, $url), 'warning');
        return false;
    }
    return $response;
}