حدود المعدل

async function requestWithBackoff(url, options, attempt = 0) {
  const response = await fetch(url, options);
  if (response.status !== 429 && response.status < 500) return response;
  if (attempt >= 4) throw new Error("Retry limit reached");

  const retryAfter = Number(response.headers.get("Retry-After"));
  const delay = retryAfter
    ? retryAfter * 1000
    : Math.min(1000 * 2 ** attempt + Math.random() * 250, 30000);
  await new Promise((resolve) => setTimeout(resolve, delay));
  return requestWithBackoff(url, options, attempt + 1);
}