protected function setupOptions(OptionsResolver $optionsResolver)
 {
     parent::setupOptions($optionsResolver);
     $optionsResolver->setDefaults(['token_url' => "https://api.acme.com/access_token", 'user_url' => "https://api.acme.com/me"]);
 }
 protected function setupOptions(OptionsResolver $optionsResolver)
 {
     parent::setupOptions($optionsResolver);
     $optionsResolver->setDefaults(['token_url' => "https://graph.facebook.com/v2.3/oauth/access_token", 'user_url' => "https://graph.facebook.com/v2.3/me"]);
 }