I can't download captions with package:googleapis/youtube/v3.dart

[najm-flutter]

the Error :
DetailedApiRequestError (DetailedApiRequestError(status: 400, message: Unsupported Output Format))

the code :

import 'package:extension_google_sign_in_as_googleapis_auth/extension_google_sign_in_as_googleapis_auth.dart';
import 'package:flutter/material.dart';
import 'package:google_sign_in/google_sign_in.dart';
import 'package:googleapis/youtube/v3.dart' as youtube;

class Test extends StatelessWidget {
  const Test({super.key});
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      body: Column(
        children: [
          MaterialButton(
              color: Colors.amber,
              onPressed: () async {
                final googleSignIn = GoogleSignIn(
                  scopes: <String>[youtube.YouTubeApi.youtubepartnerScope, youtube.YouTubeApi.youtubeForceSslScope],
                );
                if (!await googleSignIn.isSignedIn()) {
                  await googleSignIn.signIn();
                } else {
                  await googleSignIn.signInSilently();
                }

                var httpClient = (await googleSignIn.authenticatedClient())!;

                var api = youtube.YouTubeApi(httpClient);

                // Replace '<VIDEO_ID>' with the ID of the YouTube video
                var captions = await api.captions.list(["snippet"], 'fatb7Clc0MM');

                for (var caption in captions.items!) {
                  print('Caption ID: ${caption.id}');
                  print('Language: ${caption.snippet!.language}');
                  print('status: ${caption.snippet!.status}');
                  print('isEasyReader: ${caption.snippet!.isEasyReader}');
              }
             var fff = await api.captions.download(captions.items![0].id! ) ;
             print(fff?.contentType);
                //   // Fetch the actual caption content
               
              })
        ],
      ),
    );
  }
}

[kevmoo]

I'd dig in here: https://developers.google.com/youtube/v3/docs

This package just exposes the underlying API. Please reopen if there is a bug in how the underlying API is exposed.