signout function Null safety

Future<bool> signout(
  1. String username,
  2. String password
)

Signs the user out and invalidates the accessToken.

Implementation

Future<bool> signout(String username, String password) async {
  final payload = {
    'username': username,
    'password': password,
  };
  final response = await requestBody(
      http.post, _authServerApi, 'signout', payload,
      headers: {});
  final data = parseResponseMap(response);
  return data.isEmpty;
}