Rate limits

X-RateLimit-Limit: 300
X-RateLimit-Remaining: 287
X-RateLimit-Reset: 1778649660    # unix timestamp quando reset

HTTP/1.1 429 Too Many Requests
Retry-After: 12
X-RateLimit-Reset: 1778649672
Content-Type: application/json

{
  "error": "rate_limit_exceeded",
  "message": "API key exceeded 300 req/min. Retry in 12 seconds.",
  "retryAfter": 12
}

async function callWithBackoff(fn: () => Promise<Response>, maxRetries = 6) {
  for (let attempt = 0; attempt < maxRetries; attempt++) {
    const res = await fn()
    if (res.status !== 429) return res

    const retryAfter = Number.parseInt(res.headers.get('Retry-After') ?? '1', 10)
    const jitter = Math.random() * 1000
    const wait = Math.min(retryAfter * 1000 + jitter, 60_000) // cap 1min
    await new Promise(r => setTimeout(r, wait))
  }
  throw new Error('rate_limit: max retries exceeded')
}