Get Headers for API Authentication [duplicate] - flutter

Question

I'm working on a simple Flutter mobile app that needs to call out to an API that uses Basic Auth.
I can hit the API in Postman using email & password credentials and it encodes the email & password in Base64 (I assume with a ":" separating) before performing the request.
I'm not sure how to do this in Flutter / Dart...
I've tinkered with the http package and tried to do the Base64 encoding... but I just get back errors from the server.
Can anyone provide some guidance or an example for a basic auth request?

Answer 1

Assuming that your server expects that the username:password combo will be encode it UTF-8 (see RFC 7617 for more details) then use this:
import 'dart:convert';
import 'package:http/http.dart';
main() async {
String username = 'test';
String password = '123£';
String basicAuth =
'Basic ' + base64.encode(utf8.encode('$username:$password'));
print(basicAuth);
Response r = await get(Uri.parse('https://api.somewhere.io'),
headers: <String, String>{'authorization': basicAuth});
print(r.statusCode);
print(r.body);
}

Answer 2

I know it's late but I am posting this if it can help others.
import 'dart:convert';
var auth = 'Basic '+base64Encode(utf8.encode('$username:$password'));
Future<Response> callAPI(param) async {
await dio.post('/api/test',
data: {'param': param},
options: Options(headers: <String, String>{'authorization': auth}));
}