> ## Documentation Index
> Fetch the complete documentation index at: https://developers.kit.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Retries

> How Kit retries webhook deliveries that fail

A delivery is considered successful when your endpoint returns any `2xx` status. Anything else — a non-`2xx` response, a connection failure, or a timeout — marks the delivery failed and schedules a retry.

## Retry schedule

Failed deliveries are retried with backoff: `30s`, `2m`, `15m`, `1h`, `4h`, `12h`, then `24h` — up to 8 attempts (the original plus 7 retries) over about 41 hours. After the last attempt the delivery is marked permanently failed.

A retry re-POSTs the delivery's **entire** [`events` array](/webhooks/delivery-format) under the same `delivery_id`, re-signed at send time — so a late retry carries a fresh signature timestamp and whichever secrets are valid at that moment.

## Special cases

* **`410 Gone`** — Kit stops retrying immediately and marks the delivery failed. Return `410` when an endpoint no longer exists so Kit doesn't keep trying.
* **`429` / `503` with `Retry-After`** — Kit honors the `Retry-After` header when deciding when to try again (clamped between 1 second and 24 hours), so you can slow Kit down without failing outright.

## Designing for retries

* **Be idempotent.** Your handler may see the same event more than once — a retried delivery repeats every event in it, and an upstream re-emit can carry the same event under a new delivery. Deduplicate on each event's UUID `id`, which stays the same across re-sends — see [idempotency](/webhooks/verifying-signatures#idempotency).
* **Acknowledge fast.** Return `2xx` as soon as you've safely received the payload and do heavier work asynchronously, so a slow handler doesn't time out and trigger an avoidable retry.


## Related topics

- [Eventual consistency](/api-reference/eventual-consistency.md)
- [Verifying signatures](/webhooks/verifying-signatures.md)
- [Delivery format](/webhooks/delivery-format.md)
- [Changelog](/changelog.md)
- [List webhooks](/api-reference/webhooks-legacy/list-webhooks.md)