速率限制

HTTP/2 429
Content-Type: application/json
Retry-After: 1800
RateLimit-Limit: 10000
RateLimit-Policy: 200;w=1;burst=200;algorithm=token_bucket;level=account;scope=management_api, 10000;w=3600;algorithm=fixed_window;level=account;scope=management_api
RateLimit-Remaining: 0
RateLimit-Reset: 1800

async function requestWithBackoff(url, options) {
  const maxAttempts = 5;
  const baseDelayMs = 500;
  const maxBackoffMs = 30_000;

  for (let attempt = 0; attempt < maxAttempts; attempt += 1) {
    const response = await fetch(url, options);
    if (response.status !== 429) return response;
    if (attempt === maxAttempts - 1) {
      throw new Error("YCloud API rate limit persisted after retries");
    }

    const header = response.headers.get("Retry-After");
    const seconds = header === null ? NaN : Number(header);
    const serverDelayMs = Number.isFinite(seconds) && seconds >= 0
      ? seconds * 1000
      : 0;
    const backoffCap = Math.min(maxBackoffMs, baseDelayMs * 2 ** attempt);
    const delayMs = Math.max(serverDelayMs, Math.random() * backoffCap);
    await response.body?.cancel();
    await new Promise((resolve) => setTimeout(resolve, delayMs));
  }
}