body not sending using map in flutter - flutter

Question

HttpClient client = new HttpClient();
client.badCertificateCallback = ((X509Certificate cert, String host, int port) => true);
String url ='https://dev.jobma.com:8090/v4/jobseeker/login';
Map map = {
"email":"hope#yopmail.com",
"password":"123456"
};
print(map);
HttpClientRequest request = await client.postUrl(Uri.parse(url));
request.headers.set('content-type', 'application/json');
request.add(utf8.encode(json.encode(map)));
HttpClientResponse response = await request.close();
String reply = await response.transform(utf8.decoder).join();
print(reply);
and response from server showing this
{"error": 1, "data": {}, "message": "Please add mandatory fields: email, password"}

Answer 1

It is much easier if you can use http package available in dart pub.
import 'package:http/http.dart' as http;
String url = 'https://dev.jobma.com:8090/v4/jobseeker/login';
Map map = {
"email": "hope#yopmail.com",
"password": "123456"
};
var response = await http.post(url, body: map);
print('Response status: ${response.statusCode}');
print('Response body: ${response.body}');

Answer 2

It seems that without the "content-length" headers, that server isn't accepting the request properly. This will make your code work:
HttpClient client = new HttpClient();
client.badCertificateCallback =
((X509Certificate cert, String host, int port) => true);
String url = 'https://dev.jobma.com:8090/v4/jobseeker/login';
Map map = {
"email": "hope#yopmail.com",
"password": "123456"
};
print(map);
// Creating body here
List<int> body = utf8.encode(json.encode(map));
HttpClientRequest request = await client.postUrl(Uri.parse(url));
request.headers.set('content-type', 'application/json');
// Setting the content-length header here
request.headers.set('Content-Length', body.length.toString());
// Adding the body to the request
request.add(body);
HttpClientResponse response = await request.close();
String reply = await response.transform(utf8.decoder).join();
print(reply);