xmlHttpRequest Error Flutter HTTP Package

Future<bool> checkName(String name) async {
  const apiUrl = 'https://...';

  try {
    final response = await http.get(Uri.parse(apiUrl));

    if (response.statusCode == 200) {
      final Map<String, dynamic> data = json.decode(response.body);

      // Überprüfe, ob 'names' in den Daten vorhanden ist
      if (data.containsKey('names')) {
        return data['names'].contains(name);
      } else {
        throw Exception('Ungültiges Format der API-Antwort: \'names\' nicht gefunden.');
      }
    } else {
      throw Exception('Fehler bei der API-Anfrage: ${response.statusCode}');
    }
  } catch (e) {
    print('Fehler: $e');
    return false;
  }
}```

I know that I am here on the appwrite discord, but I could find help on the internet and other servers.