authHeaderValue property

@override Future<String?> get authHeaderValue

Retrieves the authentication header value, performing a refresh if needed. The refreshAuthKey call ensure that the auth header value can be eagerly refreshed to avoid failing requests due to expired tokens. Make sure to implement a refreshAuthKey method on the delegate that first checks if the token is expired and returning RefreshAuthKeyResult.skipped if not.

Implementation

@override
Future<String?> get authHeaderValue async {
  await refreshAuthKey();
  return _delegate.authHeaderValue;
}