Rate limits

import re, time, requests

def request_with_backoff(method, url, **kwargs):
    for _ in range(5):
        r = requests.request(method, url, **kwargs)
        if r.status_code == 429:
            time.sleep(int(r.headers.get("Retry-After", "1")))
            continue
        # Slow down before the limit: pause when only a few requests remain
        m = re.search(r";r=(\d+);t=(\d+)", r.headers.get("RateLimit", ""))
        if m and int(m.group(1)) == 0:
            time.sleep(int(m.group(2)))
        return r
    raise RuntimeError(f"still rate limited, X-Request-Id {r.headers.get('X-Request-Id')}")

async function requestWithBackoff(url, init) {
  let res;
  for (let attempt = 0; attempt < 5; attempt++) {
    res = await fetch(url, init);
    if (res.status === 429) {
      const wait = Number(res.headers.get("retry-after") ?? 1);
      await new Promise((r) => setTimeout(r, wait * 1000));
      continue;
    }
    // Slow down before the limit: pause when nothing remains in this window
    const m = /;r=(\d+);t=(\d+)/.exec(res.headers.get("ratelimit") ?? "");
    if (m && Number(m[1]) === 0) {
      await new Promise((r) => setTimeout(r, Number(m[2]) * 1000));
    }
    return res;
  }
  throw new Error(`still rate limited, X-Request-Id ${res.headers.get("x-request-id")}`);
}