Http post request with body parameters not working - networking

Question

Recently I started developing a small application in Flutter. I have an issue with making a network request. I have tried the call in postman and there it work. But in Flutter I never managed to make it work, I have spent like 3 hours trying to understand what I am doing wrong.
Any help will be greatly appreciated.
#override
Future<String> login(common.LoginParameters loginParameters) async {
try {
final String loginURL = "https://test.example.eu/api/login";
LoginModel loginResult;
Map bodyParams = { "inlognaam" : loginParameters.username , "wachtwoord" : loginParameters.password, "code" : loginParameters.smsCode};
//await API call
http.Response httpResponse = await http.put( loginURL, body: json.encode(bodyParams));
if (httpResponse.statusCode == 200) {
// If server returns an OK response, parse the JSON
loginResult= LoginModel.fromJson(json.decode(httpResponse.body));
} else {
// If that response was not OK, throw an error.
throw Exception('Failed to load post');
}
// if logged in get token, Otherwise return error
if (loginResult.ingelogd) {
// read the token
saveToken(loginResult.response);
return "Ingelogd";
} else {
return loginResult.error;
}
}
on Exception catch(error) {
print("Todor " + error.toString());
return "Controleer uw internet verbinding en probeer opnieuw";
}
}
In Postman if I select Post request with body parameters
inlognaam : someUsername
wachtwoord : somePassword
code : someCode
Then I get a success response

Answer 1

I pass the parameters in the following way, maybe it can work for you:
var response = await http.post(
url,
headers:{ "Accept": "application/json" } ,
body: { "state": 1}, //key value
encoding: Encoding.getByName("utf-8")
);
Another thing, you say that in postman you make a post request, but in your code you have a put request, verify what is the correct method