Handling Timeouts in AI Image Generation Without Blind Retries
A user clicks Generate. Your backend submits a request to an image provider, then the HTTP call times out. The provider may already be creating an image. Submitting again could create a second paid task. The code examples are simplified illustrations. A Timeout Leaves a Question Open An asynchronous generation API still has an initial HTTP exchange: submit a request and receive a task ID. That…
When an AI image generation service encounters a timeout, it must decide how to handle the situation without blindly retrying the request. A timeout indicates uncertainty about whether the request was received and processed by the image provider. Simply retrying could create duplicate charges and generate multiple images.
The service maintains a local identity for each generation request using a unique request ID. This request ID identifies the intended generation, while the provider assigns a task ID to the accepted work. Persisting the pairing of these IDs is crucial for idempotency.
The service distinguishes between different states:
- initializing: the request has been submitted
- submitting: the request is in progress
- pending: the request is awaiting a response
- status_unknown: response was lost before a task ID could be recorded
- storage_failed: image generated but delivery failed
- completed: image successfully generated and delivered
- failed: generation or delivery failed but cannot be determined
Confirmed rejections or generation failures are marked as failed. A confirmed rejection or generation failure leaves uncertainty about the provider's state. The service retains the reservation until a settlement decision is made.
With a provider task ID, the service can query the task. If it's still processing, the attempt and reservation are preserved. If the status query fails, uncertainty remains. If generation succeeded, the result is retrieved before treating it as completed. Without a provider task ID, the service cannot rely on normal task lookup.
If a provider offers lookup by a caller-supplied reference or supports idempotent submission, those capabilities should be confirmed. If no recovery mechanism exists, the outcome should remain unresolved. The service should not disguise a new generation as a harmless retry.
For storage failures, the image is marked storage_failed. A later query can attempt to deliver the same task without incurring additional provider charges. The application retains the reservation until a deliverable result is confirmed or another explicit settlement decision is reached.
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