how to send .htaccess username and password in Guzzle request

<?php

require 'vendor/autoload.php';

$client = new GuzzleHttp\Client();

//$client->setDefaultOption('auth', array('username', 'password', 'Basic|Digest|NTLM|Any'));
$client->setDefaultOption('auth', array('DjangoFR', '********', 'Basic'));

$res = $client->get('http://www.example.com/system/get_user_categories/format/json/user_id/**10**');

echo $res->getStatusCode();
// 200

echo $res->getHeader('content-type');
// 'application/json; charset=utf8'

echo $res->getBody();
// {"type":"User"...'

var_export($res->json());
// Outputs the JSON decoded data