Go net/http client for Sume images: handle 200 and 202 on a model swap

In Go, read the model id from an environment variable, post to https://api.sume.com/v1/images, and branch on the HTTP status: 200 carries an image list in data, and 202 carries a job envelope with status_url. The same binary then runs against any Sume image id, so a swap from a retired gpt-image-1 call is a changed variable, not a rebuild.

The two bodies share the key data but not its type: a list on 200 and an object on 202. Decode into the shape that matches the status code.

The client

Set an explicit client timeout above Sume's 30 second default wait. http.DefaultClient has no timeout.

package main

import ("bytes"; "encoding/json"; "fmt"; "net/http"; "os"; "time")

func main() {
	body, _ := json.Marshal(map[string]any{"model": os.Getenv("SUME_IMAGE_MODEL"), "prompt": "ceramic mug on linen"})
	req, _ := http.NewRequest("POST", "https://api.sume.com/v1/images", bytes.NewReader(body))
	req.Header.Set("Authorization", "Bearer "+os.Getenv("SUME_API_KEY"))
	req.Header.Set("Content-Type", "application/json")
	res, err := (&http.Client{Timeout: 60 * time.Second}).Do(req)
	if err != nil {
		panic(err)
	}
	defer res.Body.Close()
	switch res.StatusCode {
	case 200:
		var ok struct{ Data []struct{ URL string `json:"url"` } `json:"data"` }
		json.NewDecoder(res.Body).Decode(&ok)
		fmt.Println(ok.Data[0].URL)
	case 202:
		var job struct{ Data struct{ StatusURL string `json:"status_url"` } `json:"data"` }
		json.NewDecoder(res.Body).Decode(&job)
		fmt.Println("poll", job.Data.StatusURL)
	default:
		fmt.Println("failed", res.StatusCode)
	}
}

What each status means

Run it

Run SUME_IMAGE_MODEL=openai/gpt-image-2.5-sunburst go run main.go. Slow settings such as 4K and high quality can degrade to a 202, so keep the 202 branch even if your test prompt returns a 200. The id and date details are in the main shutdown post.