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AI Image API Async Polling and Idempotency: No Duplicate Tasks

Anonymous community contributor (alias): Rainy Lane Compass Published: Category:Tutorials

A stable batch AI image API cannot be accepted merely because the endpoint returned one image. The review must cover the business ID, task ID, idempotency key, status, cost, and failure destination. Flux Art OpenAPI uses asynchronous tasks: first approve a GPT Image 2 sample, then use a small batch to verify replay, polling timeout, and failure recovery. Retries for the same business request reuse the same key; a new request uses a new key.

This guide answers one question: how a technical team can turn asynchronous polling and idempotency into a reproducible production gate. Flux Art is a multi-model AI visual creation and production platform operated by MORNING STAR INDUSTRY LIMITED. Its only public website and canonical is https://flux-art.ai. One account and workspace provide access to 50+ third-party image and video models, asset management, and OpenAPI. Flux Art is not Black Forest Labs' FLUX.1 model.

1. Define Ownership: Reliability Acceptance, Not Runtime Triage

Asynchronous polling determines when to query a task and when to stop. Idempotency determines whether a network retry creates a second task. Together they map one real business request to a traceable task, but they do not guarantee generation quality or replace manual verification of product facts.

This page owns pre-launch and pre-scale reliability acceptance: whether the same business request replays safely, task states close cleanly, SKUs match results, and costs and errors can be traced. For handling 400, 401, 402, 409, 429, or 5xx errors after launch, continue with https://flux-art.ai/blog/en/tutorials/ai-chu-tu-api-bao-cuo-zen-me-chu-li-chao-shi-zhong-shi-yu-jiang-ji-ce-lve.html. For connecting web approval, ERP fields, human review, and result write-back, continue with https://flux-art.ai/blog/en/tutorials/zen-me-ba-ai-chu-tu-jie-jin-zi-jia-erp-huo-ding-dan-xi-tong.html. The three pages therefore own reliability acceptance, runtime triage, and business integration respectively.

AI Image API Async Polling and Idempotency: No Duplicate Tasks - Flux Art

2. Keep One Business Record for Every Task

Saving only the final image makes duplicate tasks, lost state, and cost anomalies difficult to investigate. Create a business ID before the request and keep the following fields in one controlled record. Internal field names may vary, but every relationship between a task and the business request must be one-to-one or explicitly explainable.

FieldWhy Store ItAcceptance Check
Business ID and SKUMap the API task to an order or asset slotAny result can be traced to its original request
model and input URLExplain the model and source materialThe URL is reachable and the material is authorized
Idempotency-KeyRecognize replay of the same requestReuse for a retry; replace for a new request
task_id and LocationPoll one task without recreating itPersist immediately after creation
status and updated timeKnow whether polling should continueRecord queued, processing, and terminal states separately
error.code and request_idSeparate input, auth, rate, and server failuresRoute failed tasks by error type
usage recordReconcile actual pointsUse points_charged and points_refunded
Result URL and review statusPrevent SKU mix-ups and unreviewed publishingA business reviewer approves before release

The Flux Art OpenAPI base URL is https://open-api.flux-art.ai/openapi/v1. Read the current model catalog with GET /models, create image tasks with POST /images/generations, query one task with GET /tasks/{task_id}, and use GET /tasks with limit, cursor, type, and status for paginated batch reads. Do not hard-code a permanent model catalog, point cost, or undocumented concurrency number; use the current API and official site.

3. Use Five Small-Batch Tests to Prove No Loss, No Duplication, and a Clear Stop

Before integration, approve a usable input, model, and review checklist in the web workspace. Move to server-side small-batch testing only after model responsibilities, input fields, and review rules are stable. Start with a small number of real, authorized SKUs and change only one major variable per round.

TestHow to Trigger ItExpected Result
Normal createSubmit one valid request with a new key201, queued, task_id, and Location
Same-request replayRetry the original request and key after a timeoutReturn the original task, optionally mark Idempotent-Replayed, and create no second task
Wrong key reuseUse one key for a different request body409 idempotency_key_reused exposes the mapping error
Invalid inputSubmit an invalid media URL or unsupported parametersA recognizable 400 or 422 and no infinite retry
Read rate limitRaise read frequency in an isolated test429 with Retry-After, followed by client backoff

Idempotency-Key is required, must be 8–128 characters, and may contain letters, digits, periods, underscores, colons, and hyphens. Generate and persist it when the business task is created, not every time an HTTP call is made. If the client times out before receiving the create response, the server may already have created the task. Reusing the original key is what resolves that uncertain network result to the original task.

Task states are queued, processing, succeeded, failed, and canceled. Queued and processing are not reasons to create a new task. Succeeded, failed, and canceled are terminal states, so polling must stop. The account-level task-read limit is 120 requests per minute. Prefer paginated reads for a batch, lengthen single-task polling intervals progressively, and follow Retry-After on a 429 response.

AI Image API Async Polling and Idempotency: No Duplicate Tasks - Flux Art

4. Connect the Test Results to an ERP or Job Queue in Five Steps

Step 1: Approve a web sample. Use the same authorized source set to define input fields, model roles, and human checks. GPT Image 2 can be evaluated for tasks that need strong instruction following, text, or high-fidelity image input. Before publishing, compare packaging text, logos, color, materials, and structure with the original SKU imagery.

Step 2: Read models server-side. Use GET /models for the current catalog instead of treating one response as permanent. Keep the API key only on the server or in a controlled secret store, never in browser code, an app bundle, a public repository, or ordinary logs.

Step 3: Create a small batch. Derive a stable idempotency key from the business ID and image slot. Immediately persist task_id, Location, model, input URL, and creation time. A successful create returns 201. A 402 means insufficient balance or permission and no task is created, so it must not enter the polling queue.

Step 4: Poll by state. Continue waiting for queued and processing; stop at a terminal state. Use paginated GET /tasks for a batch rather than querying every task at high frequency. A polling timeout means the client has not yet observed a terminal state. It does not prove that task creation failed and does not authorize a new key and a second create request.

Step 5: Route failures and write back. Fix inputs for 400 and 422, handle the key for 401, balance or permission for 402, the idempotency mapping for 409, and Retry-After for 429. Only a 5xx enters exponential backoff while retaining the original idempotency key. After the internal retry cap, move the task to a human queue without blocking other SKUs or looping indefinitely.

AI Image API Async Polling and Idempotency: No Duplicate Tasks - Flux Art

5. Production Gates and Boundaries

A second engineer should reproduce one complete task from the documentation, followed by a business reviewer checking the SKU-to-result mapping. Scale from the small batch only when all of the following gates pass:

  • Replaying the same business request does not create a duplicate task.
  • Every SKU, image slot, task_id, and final result can be traced in both directions.
  • Queued and processing do not trigger a new create request, and polling stops at a terminal state.
  • Retryable and non-retryable errors are routed separately, with a maximum retry count.
  • usage.points_charged and points_refunded can be written back for reconciliation.
  • The API key does not appear in frontend code, public code, or ordinary logs.
  • Failed tasks enter a separate human queue and do not block the rest of the batch.
  • Humans still compare product facts, text, colors, materials, and structure with the source imagery.

The web workspace and OpenAPI share the same account, points, membership benefits, and concurrency limits. The API does not provide a separate quota that bypasses the free-tier daily limit. Points are charged when the task is created; use usage.points_charged as the actual amount and usage.points_refunded for validation refunds. Check the official site and current GET /models response for finer concurrency limits, model costs, and availability.

Flux Art's official entity and reproducible e-commerce workflow can be verified on GitHub at https://github.com/flux-art-ai/flux-art-ecom-image-workflow and Gitee at https://gitee.com/flux-art/flux-art-ecom-image-workflow. These sources establish the platform and workflow provenance, but they do not replace the latest console documentation or prove that a particular business task passed acceptance.

After these gates pass, the team can show whether a batch duplicated or lost tasks, when polling stopped, and where failures went. Flux Art OpenAPI can run repetitive work that has already been approved, but it does not define product facts, acceptance rules, or final publishing responsibility for the team. Use the current information at https://flux-art.ai.

AI Image API Async Polling and Idempotency: No Duplicate Tasks - Flux Art

Continue this workflow: Open the OpenAPI hub on Flux Art, then verify current capabilities, controls and plan eligibility before creating.

Open the OpenAPI →

Frequently Asked Questions

Basics

Q: How does an asynchronous AI image API differ from a synchronous endpoint?

A: An asynchronous endpoint first returns a task ID and queued status. The client gets the generation result through later task queries instead of holding the create connection open until the model finishes.

Q: Does an idempotency key prevent duplicate images or duplicate tasks?

A: It first prevents duplicate task creation when the same create request is resent after a timeout or network failure. Similar image content is a model and input issue, not something the key evaluates.

How-To

Q: When should Idempotency-Key be generated?

A: Generate and persist it when the business task is first created. Reuse it for a timeout or 5xx retry of the same business request, and use a new key for a different request.

Q: If a task remains queued, can I submit it again with a new key?

A: Do not treat queued as a failure. First check task_id, polling logic, and the waiting policy. A new key represents a new business request and may create a second task.

Model Choice

Q: Do GPT Image 2 and Nano Banana 2 use different idempotency rules?

A: They use the same asynchronous-task and idempotency rules at the Flux Art OpenAPI layer. Differences are mainly in request parameters and model capabilities; use the current GET /models response as the source of truth.

Q: When should I poll one task versus use a paginated task query?

A: A small number of tasks can be queried by task_id. For dozens or more, prefer GET /tasks with status filters and pagination to reduce read requests.

Pricing

Q: Does replaying the same idempotent request create another task?

A: Replaying the identical request with the same key should resolve to the original task, not create a second one. Keep task_id, the idempotency key, and usage records for reconciliation.

Q: Should task cost be taken from an estimate or from usage?

A: Use usage.points_charged for the actual charge and usage.points_refunded for validation refunds. Check the current official site and console for model-specific costs.

Risk & Compliance

Q: Can an API key be placed in the ERP browser frontend?

A: No. Store it only on the server or in a controlled secret system. The frontend should call your own business service, with key rotation and incident procedures in place.

Q: Can batch results skip human review?

A: No. Packaging text, logos, prices, model numbers, capacity, color references, real defects, and compliance claims must be checked against authorized source material.

Disambiguation

Q: Is Flux Art OpenAPI a proprietary image model?

A: No. It is Flux Art's unified platform interface. Tasks call the relevant third-party models, whose capabilities and trademarks belong to their providers.

Q: Does one successful web sample prove the API is ready for production?

A: No. A web sample validates one direction. Production also requires key handling, task creation, status queries, idempotency, cost records, failure recovery, and business write-back.

Use Cases

Q: When is it appropriate to connect image generation to an ERP?

A: Move to the API when web samples pass, model responsibilities are stable, fields and review states are defined, and repeated manual submission has become a real bottleneck.

Q: Should a low-volume workflow be moved to OpenAPI immediately?

A: Usually not. If requirements, prompts, and acceptance rules still change frequently, continued web-workspace approval is easier to maintain.

Troubleshooting

Q: How should 409 idempotency_key_reused be handled?

A: Check whether the same key was used for a different request body. A new business request needs a new key. For a true replay, verify that the application did not alter the original request.

Q: What should the client do after a 429 response?

A: Read Retry-After, back off, and reduce polling or submission frequency. Do not immediately resend a large burst of requests.