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After Repost accepts a message, each subscribed endpoint gets its own delivery, with its own attempt history, schedule, and status. One customer’s dead endpoint never affects another’s, and a message to three endpoints is three independent deliveries.

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What counts as delivered

A delivery attempt is an HTTPS POST of the signed envelope to the endpoint URL. A 2xx response completes the delivery. Anything else is a failure: 4xx, 5xx, timeouts, connection errors, and also 3xx, because redirects are never followed. Following one would replay a signature to a location the customer didn’t register.

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The retry schedule

A failing delivery is tried 11 times over roughly 24 hours: the first attempt plus ten retries, with jitter applied so retries don’t arrive in herds at a recovering endpoint. If the endpoint responds with a Retry-After header longer than the scheduled delay, Repost honours it, up to a cap of one hour. When the last retry fails, the delivery moves to the dead-letter queue with its full attempt history. Endpoint state changes cut the schedule short instead of wasting attempts. Pausing an endpoint holds its deliveries until resume, which then drains the backlog in order. Disabling one fails its deliveries terminally as endpoint_disabled, and deleting one fails them as endpoint_gone. Updating an endpoint’s URL or headers applies to pending retries too.

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Delivery statuses

Deliveries can be listed and inspected over the API, in the dashboard’s Messages view, or by the customer in their portal:

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Attempt logs

Every attempt is recorded: the response status, latency, an error class such as TIMEOUT or CONNECTION_FAILED, and a bounded excerpt of the response body and headers (up to 4 KiB each). Sensitive request headers are stored as [redacted]; only content-type, user-agent, webhook-id, and webhook-timestamp are kept verbatim, and Set-Cookie response headers are dropped. There is enough to debug a failing endpoint without secrets ending up in logs. Customers see the same attempt history for their own endpoints, live, in the portal.

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Replay and redeliver

A delivery in the dead-letter queue is not lost. Replay it with one call, or re-send an already-delivered message to a specific endpoint, for example after a customer restores from a backup:
Both return 202 and re-enter the normal pipeline, signed with the endpoint’s current secrets and recorded like any other attempt. Customers can replay their own dead-lettered deliveries from the portal.
Receivers should treat delivery as at-least-once and dedupe on the webhook-id header. Retries after a lost 2xx, replays, and redeliveries can all deliver the same message more than once, and webhook-id is stable across all of them.

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Continue

Signing

The headers on every delivery, and how customers verify them.

Customer portal

Delivery logs, the dead-letter queue, and replay, in your customer’s hands.

HTTP API

The idempotency rules that feed this pipeline exactly once.