What is an Assembly Notification?
A Transloadit Assembly Notification is an optional POST request sent to a specified URL after an Assembly finishes. Its payload contains the resulting Assembly Status.
How Assembly Notifications work
A notification is a server-to-server completion delivery that pushes the final job representation to an application endpoint. It decouples media processing from the lifetime of the originating HTTP connection and therefore fits durable background workflows. The receiver should verify authenticity, persist the execution identity, and acknowledge only after safe handling. Delivery semantics also require duplicate-safe business logic rather than assuming a single request.
Key facts
- 1The notification body carries Assembly status data, letting a receiver correlate the event, inspect terminal outcome, and locate results without keeping the upload request open.
- 2A non-success response from the callback endpoint can lead to another delivery attempt, so side effects such as publishing or billing need an idempotency guard keyed by the Assembly.
- 3Because the destination is an application-controlled URL, endpoint availability, TLS configuration, authentication checks, and response latency all affect reliable handoff.
When Assembly Notifications matter
Use notifications instead of continuous polling when a system can receive asynchronous completion events. Authenticate and make the receiver idempotent, because forged or repeated requests must not duplicate work.