DioErrorType.RESPONSE无效的媒体类型

Question

我的flutter项目在android上运行得很好，但当我试图把它放到web上时，我遇到了一些麻烦。我使用Graphql Faker作为伪后端，它在安卓系统上运行良好，但对于flutter web，它总是抛出以下错误

╔╣ Request ║ POST 
║  http://localhost:9002/graphql
╚══════════════════════════════════════════════════════════════════════════════════════════

╔╣ DioError ║ Status: 500 Internal Server Error
║  http://localhost:9002/graphql
╚══════════════════════════════════════════════════════════════════════════════════════════
╔ DioErrorType.RESPONSE
║    {
║         errors: [{message: invalid media type}]
║    }
╚══════════════════════════════════════════════════════════════════════════════════════════

下面是客户端的外观

GraphQLClient graphQLClient()  {
  final dio = Dio(
    BaseOptions(
      connectTimeout: 3 * 1000,
      contentType: 'application/json',
    ),
  );

  final host = () {
    try {
      if (Platform.isAndroid) return MY_IP;
    } catch (_) {}
    return 'localhost';
  }();

  final graphqlEndpoint = 'http://$host:9002/graphql';
  final WebSocketLink _wsLink = WebSocketLink('ws://$host:4000/graphql');

  final Link _dioLink = DioLink(
    graphqlEndpoint,
    client: dio,
  );

  // split request based on type
  final _link = Link.split(
    (request) => request.isSubscription,
    _wsLink,
    _dioLink,
  );

  return GraphQLClient(
    cache: GraphQLCache(),
    link: _link,
  );
}

如果您对此有任何意见或答复，我们将不胜感激。

Answer 1

这看起来像是CORS错误，graphql-faker文档中有一节是关于cors的：

--cors-origin CORS: Specify the custom origin for the Access-Control-Allow-Origin header, by default it is the same as Origin header from the request