getting code 400 message Bad request syntax , after post from flutter - django

Question

getting code 400 message Bad request syntax , after post from flutter,
with postman request send and no problem but with flutter after Post Map data to Django server i get this error
[19/May/2020 14:58:13] "POST /account/login/ HTTP/1.1" 406 42
[19/May/2020 14:58:13] code 400, message Bad request syntax ('32')
[19/May/2020 14:58:13] "32" 400 -
Django
#api_view(['POST'])
def login_user(request):
print(request.data)
if request.method == 'POST':
response = request.data
username = response.get('username')
password = response.get('password')
if password is not None and username is not None:
user = authenticate(username=username, password=password)
if user is not None:
create_or_update_token = Token.objects.update_or_create(user=user)
user_token = Token.objects.get(user=user)
return Response({'type': True, 'token': user_token.key, 'username': user.username},
status=status.HTTP_200_OK)
else:
return Response({'type': False, 'message': 'User Or Password Incorrect'},
status=status.HTTP_404_NOT_FOUND)
else:
return Response({'type': False, 'message': 'wrong parameter'}, status=status.HTTP_406_NOT_ACCEPTABLE)
else:
return Response({'type': False, 'message': 'method is wrong'}, status=status.HTTP_405_METHOD_NOT_ALLOWED)
flutter
Future<dynamic> postGoa(String endpoint, Map data)async{
Map map = {
"username":"user",
"password":"password"
};
var url = _getUrl("POST", endpoint);
var client = new HttpClient();
HttpClientRequest request = await client.postUrl(Uri.parse(url));
request.headers.set('content-type', 'application/json');
request.headers.set('Authorization', 'Bearer '+ athenticated
);
request.add(utf8.encode(json.encode(map)));
HttpClientResponse response = await request.close();
String mydata= await response.transform(utf8.decoder).join();
client.close();
return mydata;
}
}
after add
request.add(utf8.encode(json.encode(map)));
i get error in Django console

Answer 1

Try printing out your request headers from the Django application.
print(request.headers)
I bet one of the headers is Content-Type: ''. If that is the case, Django isn't reading your POST data because it thinks there is no data. I recommend calculating the length of the content you are sending in Flutter, then sending the correct Content-Length header with your request.
That might look something like this (in your Flutter app):
encodedData = jsonEncode(data); // jsonEncode is part of the dart:convert package
request.headers.add(HttpHeaders.contentLengthHeader, encodedData.length);