public $errors = [
'invalid-endpoint' => 'The endpoint you supplied does not appear to be valid.',
+ '401' => 'Unauthorized.',
'403' => 'Permission denied.',
'404' => 'Endpoint not found.',
'405' => 'Method not allowed.',
+ '504' => 'Gateway timeout server response timeout.',
'1000' => 'An unknown error occurred.',
'1001' => 'Access token required.',
'1002' => 'Not within application scope.',