flutter dio请求报错 application/json

错误信息如下

[VERBOSE-2:ui_dart_state.cc(157)] Unhandled Exception: DioError [DioErrorType.DEFAULT]: Error on line 1, column 24: Invalid media type: expected "=".
  ╷
1 │ application/json; utf-8
  │                        ^
  ╵
#0      DioMixin._dispatchRequest (package:dio/src/dio.dart:963:7)
<asynchronous suspension>
#1      DioMixin._request._interceptorWrapper.<anonymous closure>.<anonymous closure>.<anonymous closure> (package:dio/src/dio.dart:849:37)
#2      DioMixin.checkIfNeedEnqueue (package:dio/src/dio.dart:1117:22)
#3      DioMixin._request._interceptorWrapper.<anonymous closure>.<anonymous closure> (package:dio/src/dio.dart:846:22)
#4      new Future.<anonymous closure> (dart:async/future.dart:176:37)
#5      _rootRun (dart:async/zone.dart:1122:38)
#6      _CustomZone.run (dart:async/zone.dart:1023:19)
#7      _CustomZone.runGuarded (dart:async/zone.dart:925:7)
#8      _CustomZone.bindCallbackGuarded.<anonymous closure> (dart:async/zone.dart:965:23)
#9      _rootRun (dart:async/zone.dart:1126:<…>

解决办法 设置下请求返回的数据格式即可。这个错误大概就是请求返回的格式默认解析不了。我们这里在header里面设置下 responseType:ResponseType.plain

FormData formData ;
  Options options =Options(
        responseType:ResponseType.plain
    );

 Response response;
    Dio dio = Dio();
    response =await dio.post('',data: await formData,options:options );
    if(response.statusCode == 200){
      print(response);
    }else{
      print(response);

    }