A 202 Accepted response means a render request has been accepted for processing—not that the video is ready. Return a stable job ID and a URL the client can check, then use polling, signed webhook notifications, or both to learn the outcome. Verify callbacks before trusting their contents, and use the provider’s own documented signature scheme.
What does 202 Accepted mean for a video render?
HTTP 202 Accepted says that a request has been accepted for processing, but the processing may not have started or completed. The job can still fail or be disallowed. As MDN explains, 202 is noncommittal: the server cannot later send a separate HTTP response to the original request to report the asynchronous outcome. A client must therefore check for that outcome separately. MDN’s 202 Accepted reference was last modified July 4, 2025.
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What should the API return with 202?
Give the client a durable way to find the operation again: a stable job ID and a monitor URL. The URL can be supplied in a Location header, the response body, or both. MDN’s asynchronous request example uses a task identifier and a monitor URL; the specific field names and response shape are design choices, not a universal video API contract.
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POST /v1/renders
Content-Type: application/json
Prefer: respond-async
{"prompt":"A short animated sunrise over the ocean"}HTTP/1.1 202 Accepted
Location: /v1/renders/rnd_123
Content-Type: application/json
{"id":"rnd_123","status":"queued","status_url":"/v1/renders/rnd_123"}This provider-neutral example illustrates a monitor-resource pattern; it is not a response schema from a particular AI video service and has not been executed or tested. Prefer: respond-async expresses a preference, not a guarantee. A server may not support it, and an unsupported preference should be ignored. See MDN’s Prefer header reference.
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How should polling work?
Poll the operation resource, not the original render-creation request. The status resource should report the job’s current state and, when the job reaches a terminal state, provide either the output video URL or a useful failure. Those fields and the set of state names are implementation choices: use the rendering provider’s documented contract rather than assuming a standard vocabulary.
A client can request GET /v1/renders/rnd_123 and wait between checks, increasing the interval when appropriate to avoid needless load. Choose the interval and any limits using the provider’s documented rate limits and the responsiveness the application needs; no universal polling threshold follows from HTTP 202. A failed operation should expose a stable error code and an actionable message so the client can distinguish a render failure from a temporary status-check problem.
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Polling or webhooks: which should you use?
Polling lets a client ask for the canonical current state and recover if it missed a notification. A webhook can notify your service promptly when a state changes, avoiding repeated checks from the client. Where the provider supports callbacks, using both can be resilient: callbacks update stored operation state, and status reads reconcile or recover that state.
| Approach | Useful when | Considerations |
|---|---|---|
| Polling | The client can make outbound requests but cannot receive inbound callbacks, or needs a way to reconcile missed notifications. | Polling frequency affects request load and how quickly the interface reflects a change. Follow the provider’s limits. |
| Webhook | Your service can expose an HTTPS endpoint and the provider supports callback delivery. | Confirm the provider’s event names, signature procedure, retries, ordering behavior, and output-link expiry; these vary by provider. |
| Both | You need prompt notification as well as a way to recover or confirm current state. | Handle repeated or delayed events safely and reconcile against the operation’s stored state. |
Do not infer delivery guarantees from a webhook feature alone. For the selected provider, document its actual event contract, retry and ordering behavior, and any expiry rules for output links.
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How do you verify a signed webhook?
Authenticate a webhook before trusting its job ID, status, or output URL. Each provider defines its own signing scheme; Stripe is an example of documented verification guidance, not a recommendation to use Stripe for video rendering. For Stripe, verification uses the Stripe-Signature header, the endpoint secret, and the exact UTF-8 request body string as sent. Parsing or modifying the body before verification can invalidate the signature. Stripe also notes that events forwarded through its CLI use a different secret from events sent to a dashboard-configured endpoint. See Stripe’s signature troubleshooting guide and Webhook Endpoints API reference.
Express example for Stripe
Register the raw-body route before JSON middleware, then pass the unmodified request body and signature header to Stripe’s verification routine. Check the code against the current Stripe SDK version and your framework configuration before using it in production.
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// Register this route before express.json().
app.post('/webhook', express.raw({ type: 'application/json' }), (req, res) => {
const signature = req.headers['stripe-signature'];
let event;
try {
event = stripe.webhooks.constructEvent(
req.body,
signature,
process.env.STRIPE_WEBHOOK_SECRET
);
} catch (err) {
return res.status(400).send(`Invalid signature: ${err.message}`);
}
// Record or process the verified event idempotently.
res.sendStatus(200);
});
app.use(express.json());Only after verification should application code accept the event as authentic. Make event processing idempotent so a repeated notification does not cause duplicate work; consult the provider’s documentation for delivery and ordering details.
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