Do these 3 things before closing this tab:
1Scan for outdated or missing drivers - takes under a minute2Repair Windows errors before they cause bigger problems3Fix the driver behind crashes, sound loss and screen glitchesTo show AI video generation progress reliably, treat each render as a durable asynchronous job: accept it through a normal HTTP request, track its state on your server, receive provider webhooks when available (or poll the provider when they are not), then publish normalized job updates to the browser over Server-Sent Events (SSE). SSE carries lifecycle notifications—not the generated video or a frame-by-frame preview.
How do I show video generation progress in real time?
Keep job execution, provider notifications, and browser updates as separate parts of the workflow. The provider may take long enough to render that holding the request from the browser open is impractical. Instead, return an application job ID promptly and let the browser subscribe to that job’s event stream.
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- Accept a job. The browser sends a regular
POSTwith the prompt and options. Validate the request and create a durable record with an application job ID and a status such asqueued. - Submit it to the provider. Store the provider’s job or operation ID against the application record. Return the application job ID to the browser rather than waiting for the video render to finish.
- Track the provider’s result. Process a verified webhook if the provider supports one. Otherwise, a background worker checks the provider’s status endpoint using bounded polling.
- Persist each transition. Update the durable job record before notifying connected clients. Publish a normalized event such as
job.running,job.completed, orjob.failed. - Subscribe from the browser. Open an SSE endpoint for the application job, for example
/api/jobs/job_123/events. Render the reported status and, when available, a result pointer or playback link.
This lets the front end use the same event format whether a state change came from a webhook or a polling worker. It also means that a browser disconnect does not erase the job’s state.
What the browser receives
An SSE stream is a long-lived HTTP response with events separated by blank lines. A minimal event might look like this:
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event: job.completed
data: {"jobId":"job_123","status":"completed","videoUrl":"https://media.example/video.mp4"}
The event line names the event, data carries its payload, and id identifies it for reconnection and replay. The URL and identifiers in this example are illustrative; your application should emit a result location only if it actually has one.
Should I use SSE or webhooks for an AI video generation API?
They solve different directions of communication, so a typical application uses both. A webhook is provider-to-server: it tells your backend about an operation. SSE is server-to-browser: it tells the user’s page about your application’s view of that operation. The browser’s EventSource interface is one-way; send prompts, cancellation requests, and edits through ordinary HTTP endpoints or a separately chosen bidirectional transport.
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| Mechanism | Connection | Use it for | Important limit |
|---|---|---|---|
| Provider webhook | Provider to your server | Notifying your backend of job events when the provider offers callbacks | Event names, signatures, payloads, and delivery behavior vary by provider. |
| Server-Sent Events | Your server to the browser | Sending application job-state updates to an open page | It is one-way; it does not send user commands to the server or stream the video itself. |
| Server-side polling | Your worker to the provider | Checking status when callbacks are unavailable, or reconciling unresolved jobs | It adds status requests and needs a deadline and bounded retry policy. |
Provider documentation illustrates why these roles should not be conflated. Google’s Gemini API webhook documentation describes notifications for asynchronous or long-running operations, including a video.generated event with an operation ID and output-file pointer. OpenRouter documents asynchronous video jobs with status polling and webhook options. These are provider-specific capabilities, not a universal contract. OpenAI’s cited Responses documentation describes SSE for generated responses, and its image reference describes partial-image events; neither establishes that video frames or video-job progress are streamed in the same way.
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Do not label job state as a percentage unless the provider reports one
A provider may send only a terminal success or failure notification. In that case, show honest states your application can support—such as queued, submitted, processing, completed, or failed—and avoid inventing a percent-complete value. “Real time” means timely delivery of known state changes, not necessarily a continuous render meter.
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How should webhook and polling updates reach the same job state?
Normalize incoming provider information into a small application-owned state model. Keep the raw provider event or status available for diagnosis, but let the browser depend on your stable event names and payload shape rather than a provider’s changing schema.
When the provider supports webhooks
- Configure a callback endpoint and accept only the provider’s documented event types.
- Verify the signature and any required timestamp or replay constraints using that provider’s exact procedure. Do not trust a request just because it is an HTTP
POST. - Check for a previously processed delivery or event ID. Providers may deliver the same event more than once; Gemini documents at-least-once delivery and recommends deduplication using
webhook-id. - Persist the event or enqueue its processing, then acknowledge a valid delivery promptly with a success response. Avoid doing slow file transfers or other expensive work before acknowledging it.
- Apply a valid state transition transactionally, save it, and publish the corresponding normalized event to connected clients.
Use the provider’s actual event identifier where available. If a provider documents an idempotency key or optional signature mechanism, follow its documented semantics rather than assuming another provider works the same way. OpenRouter, for example, documents an idempotency header and optional webhook signature verification.
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When polling is the fallback
Run status checks in a background worker, not in the browser and not inside the initiating request. Use a bounded backoff policy and an overall deadline; exact intervals should be chosen for the provider’s documented limits and your application’s latency needs, not treated as a universal video-rendering schedule. Stop polling once the job is terminal. Send observed changes through the same persistence and event-publishing path used for webhook events.
Polling can also serve as reconciliation: periodically check jobs that remain unresolved if a callback was delayed, lost, or arrived while your application was unavailable. OpenRouter’s video guide documents status polling, while a TanStack AI example demonstrates polling on the server and forwarding updates as SSE. That framework example shows one implementation pattern, not a provider requirement.
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How do I reconnect to SSE without losing job updates?
EventSource reconnects automatically after a connection drops. SSE supports an id field, which updates the browser’s last-event ID, and a retry field, which specifies a reconnection delay in milliseconds. Automatic reconnection alone does not guarantee that the browser will receive events it missed; your server must decide how to recover them.
Choose a recovery strategy
- Replay retained events: Assign IDs to persisted events and, when a client reconnects, replay events after the last ID it received. Retain them long enough for the disconnects your application expects to handle.
- Send a current snapshot: If you do not keep an event log, have the client fetch the durable job state after reconnecting and resume listening. A snapshot can restore the current truth, though it cannot reproduce every intermediate transition.
- Combine the two: Replay available events, then send a current snapshot or reconcile against it to cover gaps beyond the replay window.
Do not assume the provider will resend every intermediate progress update. The durable application record—or a retained application event log—should be the recovery source of truth.
Keep streams usable at scale
- Send SSE comment heartbeats if an intermediary may close an idle connection; comments do not dispatch browser events.
- Close the client’s EventSource when the user leaves the job view or no longer needs updates. After a terminal event, the client can close its stream explicitly.
- Account for browser connection limits. MDN notes that without HTTP/2, browsers impose a low per-browser, per-domain SSE connection limit. HTTP/2 or one multiplexed stream for multiple jobs can reduce the number of open connections.
- Authenticate and authorize the stream against the job or user. Do not expose a job’s updates merely because a caller knows its ID.
What should a production-ready workflow guard against?
- Duplicate callbacks: Deduplicate on a stable provider event or delivery ID and make state transitions idempotent.
- Out-of-order or stale events: Enforce valid transitions against stored state; do not let an older notification move a completed job back to processing.
- Webhook outages: Keep a reconciliation route for unresolved jobs rather than treating webhook support as a guarantee that every update will arrive.
- Slow acknowledgement: Verify, record or enqueue, and acknowledge promptly; finish expensive downstream tasks asynchronously.
- Idle-stream timeouts: Use heartbeats where needed and confirm that reverse proxies or other intermediaries are configured to pass through streaming responses.
- Connection overload: Choose per-job streams for simple isolation or multiplexed user streams when users monitor many jobs; measure the operational trade-off for your deployment.
- Misleading progress: Report only states or progress values supported by the provider or by a clearly defined application-side measure.
- Confusing event delivery with media delivery: Treat callbacks as status notifications unless provider documentation explicitly says otherwise. Gemini describes an output pointer in its video event, and OpenRouter documents retrieving generated video separately; fetch or serve the media through the appropriate result path.
How do I choose an integration approach?
Before committing to a provider integration, verify its current documentation for the exact API version and assess these points:
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- Notification mechanism: Does it offer a native webhook, status polling, provider-specific streaming, or more than one option?
- Event detail: Are intermediate progress events documented, or are only terminal states available?
- Delivery behavior: Are retries, at-least-once delivery, stable event IDs, or deduplication keys documented?
- Security: What signature scheme and timestamp checks apply? Can secrets be rotated safely, and are callback destinations constrained?
- Recovery: Can you look up a job after a missed notification, and how do you retrieve its output?
- Result shape: Does a callback contain media, a file pointer, or only a status? Do not assume the video itself arrives in the webhook.
- Browser delivery: Should each job get its own SSE connection, or should one user-level stream multiplex updates? Will clients need replay after a disconnect?
Provider contracts change. Check current documentation for webhook signatures, event catalogs, retry behavior, status endpoints, output retention, quotas, and pricing before implementing or deploying a specific integration.
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