如何在flutter graphql调用中发送cookie

dependencies:
  flutter:
    sdk: flutter
  graphql_flutter: ^4.0.0
  http: ^0.13.3

import 'package:graphql_flutter/graphql_flutter.dart';

final HttpLink httpLink = HttpLink('YOUR_GRAPHQL_ENDPOINT');

final ValueNotifier<GraphQLClient> client = ValueNotifier<GraphQLClient>(
  GraphQLClient(
    link: httpLink,
    cache: GraphQLCache(),
  ),
);

import 'package:http/http.dart' as http;

final String cookie = 'YOUR_COOKIE_VALUE';

final http.Client httpClient = http.Client();

final http.Request request = http.Request('POST', Uri.parse('YOUR_GRAPHQL_ENDPOINT'));
request.headers.addAll({'Cookie': cookie});

final http.StreamedResponse response = await httpClient.send(request);

final String responseBody = await response.stream.bytesToString();

final QueryResult result = await client.value.query(QueryOptions(
  document: gql('YOUR_GRAPHQL_QUERY'),
));

if (result.hasException) {
  print(result.exception.toString());
} else {
  print(result.data.toString());
}