速率限制

HTTP/1.1 429 Too Many Requests
X-RateLimit-Limit: 600
X-RateLimit-Remaining: 0
X-RateLimit-Reset: 1792764060000
Retry-After: 37

{
  "error": {
    "code": "rate_limit_exceeded",
    "message": "Too many requests.",
    "doc_url": "https://getqr.com/account/api-docs#error-rate_limit_exceeded"
  }
}

async function getqrFetch(url, options = {}, maxRetries = 5) {
  for (let attempt = 0; ; attempt++) {
    const res = await fetch(url, {
      ...options,
      headers: {
        Authorization: `Bearer ${process.env.GETQR_API_KEY}`,
        ...options.headers,
      },
    });

    const retryable = res.status === 429 || res.status >= 500;
    if (!retryable || attempt >= maxRetries) return res;

    // On 429, wait for Retry-After (seconds). Otherwise back off: 1s, 2s, 4s…
    const retryAfter = Number(res.headers.get("Retry-After"));
    const wait =
      res.status === 429 && retryAfter > 0
        ? retryAfter * 1000
        : 1000 * 2 ** attempt;
    const jitter = Math.random() * 250;

    await new Promise((r) => setTimeout(r, wait + jitter));
  }
}