async-api-cleanup-in-flutter.dart

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import 'dart:io';

final checkoutUrl = Uri.parse('https://somewebsite.com/api/checkout');
final cleanupUrl = Uri.parse('https://somewebsite.com/api/cleanup');

Future<HttpClientResponse> prepareRequest(HttpClientRequest request) {
  request.headers.add('Content-Type', 'application/json');
  request.headers.add('Accept', 'application/json');
  return request.close();
}

Future<bool> cleanup(HttpClient client) {
  return client.postUrl(cleanupUrl).then(prepareRequest).then((_) => false);
}

Future<bool> checkOut() {
  final client = HttpClient();
  return client
      .postUrl(checkoutUrl)
      .then(prepareRequest)
      .then((_) => true)
      .onError((_, __) => cleanup(client));
}