GuzzleHttpExceptionConnectException: cURL error 7:  (see http://curl.haxx.se/libcurl/c/libcurl-errors.html) in /(...)/vendor/guzzlehttp/guzzle/src/Handler/CurlFactory.php:186

CURLE_COULDNT_CONNECT (7)

Failed to connect() to host or proxy.

composer require google/apiclient

$client = new Google_Client();
$client->setDeveloperKey($this->config->item('google_key'));
$youtube = new Google_Service_YouTube($client);
// The next line throws the exception:
$response = $youtube->playlistItems->listPlaylistItems('snippet', ['playlistId' => $this->config->item('youtube_playlist_id'), 'maxResults' => 20]);
// More code