FormatException in flutter-CodePudding

i'm trying to send data to my server using post http method. Backend works perfectly (test made with postman) but i'm getting this error in flutter!

here is my code:

Future<MesureModel?> postMeasurement(String description) async {
    final response = await http.post(
        Uri.parse('${baseUrl}/api/v1/measurements/create'),
        body: {"description": description});
    var data = response.body;
    return MesureModel.fromJson(jsonDecode(response.body));
  }

and here is my model:

List<MesureModel> mesureModelFromJson(String str) => List<MesureModel>.from(
    json.decode(str).map((x) => MesureModel.fromJson(x)));

String mesuretModelToJson(List<MesureModel> data) =>
    json.encode(List<dynamic>.from(data.map((x) => x.toJson())));

class MesureModel {
  MesureModel(
      {required this.measurement_id,
      required this.measured_value,
      required this.taken_by,
      required this.param_name,
      required this.description});

  int measurement_id;
  double measured_value;
  String taken_by;
  String param_name;
  String description;

  factory MesureModel.fromJson(Map<String, dynamic> json) => MesureModel(
      measurement_id: json["measurement_id"],
      measured_value: json["measured_value"],
      taken_by: json["taken_by"],
      param_name: json["param_name"],
      description: json["description"]);

  Map<String, dynamic> toJson() => {
        "measurement_id": measurement_id,
        "measured_value": measured_value,
        "taken_by": taken_by,
        "param_name": param_name,
        "description": description
      };
}

I would be grateful if anyone could help me!

CodePudding user response：

Future<MesureModel?> postMeasurement(String description) async {
final response = await http.post(
    Uri.parse('${baseUrl}/api/v1/measurements/create'),
headers: {
  'Content-Type': 'application/json',
},
    body: json.encode({"input_description": description}));
var data = response.body;
return MesureModel.fromJson(jsonDecode(response.body));
}

Json encode the body before sending

CodePudding user response：

You should specify Content-Type and encode payload

  final response = await http.post(
    Uri.parse('${baseUrl}/api/v1/measurements/create'),
    headers: <String, String>{
      'Content-Type': 'application/json; charset=UTF-8',
    },
    body: jsonEncode(<String, String>{
      "description": description,
    }),
  );

  var data = response.body;
  return MesureModel.fromJson(jsonDecode(response.body));