use GuzzleHttpClient;
 use GuzzleHttpExceptionConnectException;
  try {
  $client = new Client();
  $response = $client->request('GET', $url); //it crashes at this line
  $content = json_decode($response->getBody(), true);

}
catch (ConnectException $e) {
  Drupal::logger('amu_hal')->error('incorrect_url'.$url);
}