如何在Flutter中解码Gzip Http响应？

import 'dart:io';
import 'dart:convert';

Future<void> main() async {
  final client = HttpClient();
  final request = await client.getUrl(Uri.parse('http://example.com'));
  final response = await request.close();

  if (response.headers.value('content-encoding') == 'gzip') {
    final gzipCodec = GzipCodec();
    final decodedResponse = await response.transform(gzipCodec.decoder).join();
    final decodedBody = jsonDecode(decodedResponse);
    print(decodedBody);
  } else {
    final responseBody = await response.transform(utf8.decoder).join();
    final decodedBody = jsonDecode(responseBody);
    print(decodedBody);
  }
}