{
  "ok": false,
  "code": "RATE_LIMITED",
  "message": "rate limited"
}

{
  "ok": false,
  "code": "TOO_MANY_REQUESTS",
  "message": "rate_limited",
  "details": {
    "limit": 300,
    "resetAt": "2026-04-30T00:01:00.000Z"
  }
}

Retry-After: 12
x-request-id: 6efaa25e-3ef6-4a34-91c1-7ff3e0fd4cc8

async function fetchWithBackoff(url: string, init: RequestInit, attempts = 4) {
  for (let attempt = 0; attempt < attempts; attempt += 1) {
    const response = await fetch(url, init);

    if (response.status !== 429) {
      return response;
    }

    const header = response.headers.get("retry-after");
    const retryAfter = header === null ? NaN : Number(header);
    const backoffMs = Math.min(1000 * 2 ** attempt, 10000);
    const delayMs = Number.isFinite(retryAfter) && retryAfter >= 0
      ? Math.max(retryAfter * 1000, backoffMs)
      : backoffMs;
    const jitterMs = Math.floor(Math.random() * 250);

    await new Promise((resolve) => setTimeout(resolve, delayMs + jitterMs));
  }

  throw new Error("Rate limit retries exhausted");
}