How to pass this 'Dio Post Request' Problem in Flutter - flutter

Question

I have to send an object from the request. Although it works on Swagger, I cannot send it from my flutter code. When I was trying it, it always gave me Http status error 400 This problem is coming my wrong request. I examined the code of the Internet. I thought I implemented it correctly but It still does not work. Please, could you help me to solve it? Here is my interested code areas:
my api side =>
Future changePassword(id, password) async {
try {
var prefs = await SharedPreferences.getInstance();
// User sendingData = User(
// id: id,
// );
// final dataSend = sendingData.toJson();
final response = await dio.post('http://192.168.1.108:2308/api/Account/ChangePassword',
data: jsonEncode({
"id": "$id",
"password": "$password"
}),
options: Options(headers: {
HttpHeaders.acceptHeader: '*/*',
HttpHeaders.contentTypeHeader: 'application/json',
}));
if (response.statusCode != 200) {
// debugPrint('burası-------------------------' + response.statusCode.toString());
}
prefs.remove('password');
return response;
}
catch (e) {
debugPrint(e.toString());
}
}
this is my screen side that I called it =>
onPressed: () async {
var prefs = await SharedPreferences.getInstance();
var pwd = prefs.getString('password');
var email = prefs.getString('email');
final usrId = prefs.getInt('userId');
pwdFormKey.currentState!.save();
if (pwdFormKey.currentState!
.validate()) {
try {
if(oldPwdController.text==pwd){
if(newPwdController.text==newPwdController2.text) {
await api.changePassword(usrId, newPwdController.text);
Navigator.pop(context);
Fluttertoast.showToast(
msg: "Şifreniz başarıyla değiştirilmiştir.",
toastLength: Toast
.LENGTH_SHORT,
gravity: ToastGravity
.BOTTOM,
backgroundColor: CupertinoColors
.activeGreen,
textColor: CupertinoColors
.black,
fontSize: 16.0);
}
// }
// }
else {
Fluttertoast.showToast(
msg: "Yeni girdiğiniz şifreler aynı değil, lütfen kontrol ediniz.",
toastLength: Toast.LENGTH_SHORT,
gravity: ToastGravity.BOTTOM,
backgroundColor: CupertinoColors.systemRed,
textColor: CupertinoColors.black,
fontSize: 16.0);
}
}
else{
Fluttertoast.showToast(
msg: "Eski Şifreniz Hatalıdır.",
toastLength: Toast.LENGTH_SHORT,
gravity: ToastGravity.BOTTOM,
backgroundColor: CupertinoColors.systemRed,
textColor: CupertinoColors.black,
fontSize: 16.0);
}
} catch (e) {
return showDialog(
context: context,
builder: (BuildContext
context) {
return AlertDialog(
title: Text(
"Hatalı Deneme"),
content:
SingleChildScrollView(
child: ListBody(
children: [
Text(
"Hatalı şifre değiştirme işleminde bulundunuz. Lütfen tekrar deneyiniz.")
],
),
),
actions: [
TextButton(
child: const Text(
'Tamam'),
onPressed: () {
Navigator.of(
context)
.pop();
},
),
],
);
});
}
}
},

Answer 1

In post method there are 2 diff values. One is data and another one is queryParameters. You can try in this way.
Map<String, dynamic>? param = {"userName": "name"};
return await (_dio.post(
"http://192.168.1.108:2308/api/Account/ChangePassword",
data: data, //Optional
queryParameters: params,
)).catchError((e) {
if (!checkSessionExpire(e, context)) {
throw e;
}
});