# How to Poll for Generation Task Status in GPT-Image2: A Complete Implementation Guide

> Master GPT-Image2 generation task status polling. Learn how to implement the pollApimartTask helper in this complete guide to track task completion or failure efficiently.

- Repository: [苍何/awesome-gpt-image-2](https://github.com/freestylefly/awesome-gpt-image-2)
- Tags: how-to-guide
- Published: 2026-09-09

---

**Poll for generation task status in GPT-Image2 by using the `pollApimartTask` helper in [`src/apimartClient.js`](https://github.com/freestylefly/awesome-gpt-image-2/blob/main/src/apimartClient.js), which repeatedly queries the server-side endpoint until the APIMart task reaches a terminal state of `completed` or `failed`.**

The freestylefly/awesome-gpt-image-2 repository implements a robust polling mechanism for monitoring asynchronous image generation jobs. When you submit a generation request, the APIMart service returns a **taskId** that represents a long-running operation requiring active status checks until the image is ready or fails.

## Architecture of the GPT-Image2 Polling System

The polling implementation splits responsibilities between server-side API routes and a reusable client-side utility.

### Server-Side Status Endpoint ([`api/generation/status.js`](https://github.com/freestylefly/awesome-gpt-image-2/blob/main/api/generation/status.js))

The backend exposes a GET endpoint that validates the `taskId` parameter and retrieves the current state from APIMart. According to the source code in [`api/generation/status.js`](https://github.com/freestylefly/awesome-gpt-image-2/blob/main/api/generation/status.js), this route:

- Validates the incoming `taskId`
- Calls `getApimartTask` (from [`api/_lib/apimart.js`](https://github.com/freestylefly/awesome-gpt-image-2/blob/main/api/_lib/apimart.js)) to fetch the live status
- Returns the raw task object if pending, or stores and returns the final result if completed

When the task is still processing, the endpoint returns intermediate metadata; when finished, it persists the result locally before responding.

### Client-Side Polling Engine ([`src/apimartClient.js`](https://github.com/freestylefly/awesome-gpt-image-2/blob/main/src/apimartClient.js))

The client library provides `pollApimartTask`, a generic poller implemented in [`src/apimartClient.js`](https://github.com/freestylefly/awesome-gpt-image-2/blob/main/src/apimartClient.js) (lines 15-42). This function:

- Accepts a `fetchTask` callback that retrieves the latest status
- Checks `isTerminalApimartStatus(task.status)` to detect completion (returns `true` for `"completed"` or `"failed"`)
- Respects APIMart rate limits by reading the `Retry-After` header or `error.retryAfterMs`
- Supports cancellation via `AbortSignal`
- Enforces default limits of **120 attempts** or **10 minutes** (`maxElapsedMs`)

## Step-by-Step Polling Workflow

Follow this sequence to monitor generation tasks from submission to completion:

1. **Submit the generation request** to `/api/generate-image`, which creates an APIMart task and returns a `taskId`
2. **Initialize the poller** by invoking `pollApimartTask` with a `fetchTask` wrapper that calls `/api/generation/status?taskId=${taskId}`
3. **Handle progress updates** through the `onProgress` callback, which receives the task object on every poll interval
4. **Detect terminal states** automatically—the poller stops when `status` equals `"completed"` or `"failed"` and returns the final task object
5. **Abort if necessary** by passing an `AbortSignal` from `AbortController` to cancel polling during component unmount or user cancellation

## Code Implementation Examples

### React Component Implementation

Use the `useGenerationStatus` hook pattern to integrate polling into your frontend:

```javascript
import { pollApimartTask } from '../apimartClient';

function useGenerationStatus(taskId) {
  const [status, setStatus] = React.useState(null);
  const [error, setError] = React.useState(null);
  const controller = React.useRef(new AbortController());

  React.useEffect(() => {
    async function startPolling() {
      try {
        const finalTask = await pollApimartTask(
          async () => {
            const res = await fetch(`/api/generation/status?taskId=${taskId}`);
            if (!res.ok) throw new Error('STATUS_FETCH_FAILED');
            return res.json();
          },
          {
            signal: controller.current.signal,
            onProgress: (task) => setStatus(task),
            maxAttempts: 200,
            maxElapsedMs: 15 * 60 * 1000,
            intervalMs: 3000
          }
        );

        setStatus(finalTask);
      } catch (e) {
        if (e.code !== 'APIMART_POLL_ABORTED') setError(e);
      }
    }

    startPolling();
    return () => controller.current.abort();
  }, [taskId]);

  return { status, error };
}

```

The `AbortController` ensures polling stops automatically when the component unmounts, preventing memory leaks and unnecessary network requests.

### Node.js CLI Implementation

For server-side scripts or command-line interfaces, import the client directly:

```javascript
import { pollApimartTask } from './src/apimartClient.js';
import fetch from 'node-fetch';

const taskId = process.argv[2];

(async () => {
  const final = await pollApimartTask(
    async () => {
      const res = await fetch(`http://localhost:3000/api/generation/status?taskId=${taskId}`);
      return res.json();
    },
    { 
      onProgress: (t) => console.log('progress →', t.status),
      intervalMs: 2000 
    }
  );

  console.log('final task:', final);
})();

```

### Manual Polling Alternative

If you cannot use the helper, implement basic polling with `setInterval`, though this lacks rate-limit handling:

```javascript
function pollStatusManually(taskId, onUpdate) {
  const interval = setInterval(async () => {
    const { ok, status } = await fetch(`/api/generation/status?taskId=${taskId}`)
      .then(r => r.json());

    if (!ok) {
      clearInterval(interval);
      throw new Error('Failed to get status');
    }

    onUpdate({ status });

    if (['completed', 'failed'].includes(status)) {
      clearInterval(interval);
    }
  }, 2000);
}

```

**Warning:** This manual approach does not respect `Retry-After` headers or handle `APIMART_RATE_LIMITED` errors, making `pollApimartTask` the recommended solution for production use.

## Handling Rate Limits and Timeouts

The `pollApimartTask` function implements sophisticated error handling for APIMart's rate limiting:

- **Rate-limit detection:** When the API returns `APIMART_RATE_LIMITED`, the poller extracts the delay from `error.retryAfterMs` or falls back to the configured `intervalMs`
- **Timeout protection:** Set `maxElapsedMs` to prevent infinite polling (default: 600,000ms or 10 minutes)
- **Attempt limits:** Configure `maxAttempts` to cap total requests (default: 120)
- **Cancellation:** Pass an `AbortSignal` to immediately terminate the polling loop; the function throws `APIMART_POLL_ABORTED` when aborted

## Summary

- **`pollApimartTask`** in [`src/apimartClient.js`](https://github.com/freestylefly/awesome-gpt-image-2/blob/main/src/apimartClient.js) is the core utility for polling generation status in GPT-Image2
- The server-side endpoint **[`api/generation/status.js`](https://github.com/freestylefly/awesome-gpt-image-2/blob/main/api/generation/status.js)** validates task IDs and retrieves live status from APIMart
- Terminal states are **`completed`** and **`failed`**, detected via `isTerminalApimartStatus`
- Always use **`AbortSignal`** in React components to cancel polling on unmount
- Default polling limits are **120 attempts** or **10 minutes**, configurable via the `options` parameter
- The poller automatically handles **`Retry-After`** headers when APIMart rate limits are encountered

## Frequently Asked Questions

### How do I cancel an active polling operation in GPT-Image2?

Create an `AbortController` and pass its `signal` property to the `pollApimartTask` options. When you call `controller.abort()`, the poller immediately stops and throws an error with code `APIMART_POLL_ABORTED`. In React, invoke `abort()` inside the `useEffect` cleanup function to prevent state updates after unmounting.

### What are the default polling limits in pollApimartTask?

By default, `pollApimartTask` stops after **120 attempts** or **10 minutes** (600,000ms), whichever comes first. You can override these constraints by passing `maxAttempts` and `maxElapsedMs` in the options object. Exceeding either limit causes the function to throw a timeout error.

### How does the system handle APIMart rate limiting?

When APIMart returns a rate-limit response, `pollApimartTask` checks for the `Retry-After` header or the `retryAfterMs` property in the error object. The poller waits for the specified duration before retrying, preventing request throttling or account suspension. If no retry delay is specified, it falls back to the standard `intervalMs`.

### What is the difference between the server-side and client-side polling components?

The **server-side** component ([`api/generation/status.js`](https://github.com/freestylefly/awesome-gpt-image-2/blob/main/api/generation/status.js)) acts as a proxy that validates the `taskId` and fetches the current state from APIMart using `getApimartTask`. The **client-side** component ([`src/apimartClient.js`](https://github.com/freestylefly/awesome-gpt-image-2/blob/main/src/apimartClient.js)) provides the `pollApimartTask` orchestration logic, managing the retry loop, terminal state detection, rate-limit handling, and cancellation signals that govern how frequently the frontend checks the server endpoint.