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If a video-generation request times out, the response alone cannot tell you whether the server created the job. Check the API’s idempotency and job-status rules before sending anything again. When the provider guarantees deduplication, retry the same logical operation with the same key and request; when it does not, first look for the original job or follow the provider’s recovery path.

Why a timeout does not tell you whether a video was created

A timeout means your client did not receive a response in time. The request may never have reached the server, or the server may have accepted or processed it before the connection failed. Treat the result as uncertain until you can establish the operation’s status.

HTTP idempotency concerns the intended effect on the server, not whether a client would like to retry. RFC 9110 defines a method as idempotent when multiple identical requests have the same intended effect as one request. It identifies safe methods, PUT, and DELETE as idempotent. A video-creation POST is not automatically idempotent simply because you retry it. See RFC 9110, Section 9.2.2.

RFC 9110 permits retrying idempotent requests after a communication failure, but cautions against automatically retrying non-idempotent requests unless you know the operation is idempotent or know the original was not applied. An API may provide that guarantee through its own idempotency-key contract; the details are specific to that provider.

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Recover in this order

  1. Preserve the original operation. Record the endpoint, exact request body, credential identity, any idempotency key, and any client-side operation ID. Do not generate a fresh key just because the response timed out.
  2. Check the provider’s contract. Confirm whether this endpoint supports idempotency keys, what must remain identical on a retry, how keys are scoped and retained, and how the provider handles a request that is still running. Do not assume one service’s rules apply to another.
  3. Look for the original job. If you received a job ID or polling URL before losing track of the response, query that job rather than submitting another creation request. If the API offers another documented way to find the operation, use it.
  4. Retry only when the contract makes it safe. If the provider guarantees deduplication, resend the unchanged logical operation using the same key and required credential identity. Follow its instructions for an in-progress conflict; do not turn that response into a second operation.
  5. Wait as instructed and enforce a deadline. Honor a supplied Retry-After header for polling or transient responses, while also applying an overall deadline so polling does not continue indefinitely.
  6. Act on the terminal state. When the job completes, retrieve the output through the provider’s documented content endpoint. If it fails, is cancelled, or expires, inspect the error and the provider’s billing and retry terms before starting a new logical operation.

AnimGen API v1: retry with the same operation identity

AnimGen’s Public beta API v1 requires an Idempotency-Key for its video-creation operation. Its documentation says to persist the key per logical operation and, after an uncertain response, reuse the same key, credential identity, and unchanged request body. Changing credentials changes the deduplication scope, so a retry under different credentials may not be recognized as the same operation. These instructions are specific to AnimGen; verify the provider’s current contract before applying them elsewhere. See AnimGen’s Create video generation documentation (API v1, version 1.4.0; last verified 2026-09-15).

Interpret acceptance and conflicts correctly

AnimGen documents 202 Accepted as asynchronous acceptance, not completion. Save the returned task ID or polling URL and check that job’s status. Its reference lists Retry-After for 202, 429, and 503; use the supplied delay together with an overall deadline.

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A 409 is retryable only in AnimGen’s in-progress idempotency case, and then with the original request. For 400, correct the invalid input rather than repeating it unchanged. AnimGen says to retry 500 or 503 only when the error marks itself retryable; for 429, wait for Retry-After. Do not infer that every response in one of these status-code families has the same recovery behavior.

Use job status to avoid duplicate video work

A job accepted for asynchronous processing can be queued or running without producing a downloadable video yet. Check the job’s documented states and wait for a terminal result before deciding whether a new operation is needed.

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OpenRouter’s video-generation guide demonstrates polling a job ID until it completes or fails, then downloading the video only after completion. It also describes terminal-state webhooks as an alternative to polling; webhook deliveries include a key shaped from the job ID and status for safe retry deduplication. Follow OpenRouter’s own instructions for its endpoints and states, which may differ from other providers. When downloading video content through its documented content endpoint, include the API key in the Authorization header. See OpenRouter’s video-generation guide.

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When you cannot verify or safely replay the request

If the API provides neither an idempotency guarantee nor a way to query the original operation, the outcome remains uncertain. Do not assume the timeout means the server did nothing, particularly for a creation POST. Follow the provider’s documented recovery process or contact its support before submitting another request.

When comparing APIs, check the key requirement and scope, which request fields must match, how long keys are retained, what a replay returns, what happens while the first request is running, whether a job can be looked up, polling and Retry-After rules, terminal states, and failure billing or refunds. These details are not established by HTTP method semantics alone.

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