How to solve error 401 is not authorized in a Flutter app - flutter

Question

This is the state when logging in to the homepage:
Future<User?> login(String nim, String password) async {
String token = await UtilSharedPreferences.getToken();
SharedPreferences pref = await SharedPreferences.getInstance();
try {
var body = {
'username': nim,
'password': password,
};
var response = await http.post(
Uri.parse('http://dev.api.app.masoemuniversity.ac.id/v1/login_mhs'),
headers: {
'Authorization': 'Bearer $token',
},
body: body,
);
print(response.statusCode);
print(response.body);
if (response.statusCode == 200) {
return User.fromJson(jsonDecode(response.body));
} else {
return null;
}
} catch (e) {
print(e);
return null;
}
}
And this is when I call user data after login
Future<User> getDataMahasiswa() async {
String _token = await UtilSharedPreferences.getToken();
SharedPreferences _pref = await SharedPreferences.getInstance();
final response = await http.get(
Uri.parse(
'http://dev.api.app.masoemuniversity.ac.id/v1/auth/mhs_siakad/biodata'),
headers: {
'Authorization': 'Bearer $_token',
"Content-Type": 'application/json'
},
);
print(response.statusCode);
print(response.body);
if (response.statusCode == 200) {
return User.fromJson(jsonDecode(response.body)['data']);
} else {
throw Exception();
}
}
And this is the response when logging in with code 200 is successful, but when getting user data the response is code 401
I/flutter (15446): 200
I/flutter (15446): {"status":"success","data":{"nim":"20265028","name":"Sukandar","id_role":"f4d4d365-dc99-4fe7-b2b7-5daddf77e127","role":"Mahasiswa","level":7,"access_token":"eyJ0eXAiOiJKV1QiLCJhbGciOiJSUzI1NiJ9.eyJhdWQiOiIxIiwianRpIjoiYzZlNGE3ZmFmZTAzZDYyODdhMDM2NTg4MjNiZmE0MDZjOGI4YWQ1OGQ5MTRjZDkzMzRkYjhmZDQzYjc3MjRmYWFiZDgwY2FiNzYzZjI0YTEiLCJpYXQiOjE2NjU2NDY5MzkuNzc4NTUsIm5iZiI6MTY2NTY0NjkzOS43Nzg1NTQsImV4cCI6MTY5NzE4MjkzOS43Njg5MzQsInN1YiI6ImM4MzljNmNlLTUxZDEtNGZmYS05MmIxLWQwM2FlZTQ5MWNmMSIsInNjb3BlcyI6W119.mfag9cVCgIyojIkPuXXi7-xfnAsbWds5DYRLgSovE6u6NtAI8s3ZMYVQ0X7Bgu6IE_DfNDNSB2lap6_fvv_lx41NCSvegPLcOa57XBy9dIcQOeg-rWo8B0kYnvsG2q_g4UFCx2FEnhVeWKuhyqDfM3kkG2IB3c1rGNkx50A9_uGeofqrTkxlnuTnkRnYjcTuGOEj6laRnkWsE9_HTfu2Q7-Te66ZYqIllc4CH4OaxBwSKgd3qMPrvy8sFenah6mx7RgZ2h9cpiFmTM-bj8WP6lc-DiqSJyvde14vebBNylg6NJKX7dpV7oeRJGlVDuMK4Dqihy4wDNAx4q_vCYQticiRrUwvhuXY9AZnD6IhXbqrwb0bYZE3f6eg1voKltpBiVxx0YSQkIGze_w9ceEDpZsFHWszJ0U7O99mL763kEjnZ4MM60Xyn9YZ5iRCT2uswWtljI0rUrGBgR1QPWJ5oMEOXR4CWfSZ8m7LrPwBGB_JCo8Y9Dyn6fDM-A6YSfrbXW1BlEd7eW6I
I/flutter (15446): 401
I/flutter (15446): Unauthorized.

Answer 1

idk the mechanism auth in your app. may be you can try this.
after success login you got this:
I/flutter (15446): 200
I/flutter (15446): {"status":"success","data":
{"nim":"20265028","name":"Sukandar","id_role":"f4d4d365-dc99-4fe7-b2b7-
5daddf77e127","role":"Mahasiswa","level":7,"access_token":"eyJ0eXAiO.....
see, now you have an access_token. use it for get the data from server
...
final response = await http.get(
// do not use UtilSharedPreferences.getToken();
// because this token use for login, its require username and password in body
Uri.parse(
'http://dev.api.app.masoemuniversity.ac.id/v1/auth/mhs_siakad/biodata'),
headers: {
'Authorization': 'Bearer $access_token',
"Content-Type": 'application/json'
},
);
....