AUTH_RATE_LIMIT
HTTP 429Auto-retry
Per-IP auth attempt limit hit. backoff=exponential base_ms=1000; re-add to retry_policy_default.retryable_codes.
By default a failed call returns a result with an error instead of throwing, so your business flow is never interrupted.
Rate-limit and upstream errors are retried automatically with backoff, honoring the Retry-After header.
Published error codes are permanent: their meaning never silently changes, and deprecated codes keep returning for at least 12 months.