Rate limits

HTTP/1.1 429 Too Many Requests
Content-Type: application/json
Retry-After: 47

{
  "title": "Too Many Requests",
  "detail": "Rate limit exceeded. Try again in 47 seconds.",
  "status": 429
}

import time
import requests

def call(method, url, **kw):
    backoff = 1
    for attempt in range(6):
        r = requests.request(method, url, **kw)
        if r.status_code == 429:
            wait = int(r.headers.get("Retry-After", backoff))
            time.sleep(wait)
        elif r.status_code >= 500:
            time.sleep(backoff)
        else:
            return r
        backoff = min(backoff * 2, 30)
    return r

async function call(input: RequestInfo, init?: RequestInit): Promise<Response> {
  let backoff = 1000;
  for (let attempt = 0; attempt < 6; attempt++) {
    const r = await fetch(input, init);
    if (r.status === 429) {
      const retryAfter = Number(r.headers.get("Retry-After") ?? backoff / 1000);
      await new Promise(res => setTimeout(res, retryAfter * 1000));
    } else if (r.status >= 500) {
      await new Promise(res => setTimeout(res, backoff));
    } else {
      return r;
    }
    backoff = Math.min(backoff * 2, 30000);
  }
  throw new Error("call failed after 6 attempts");
}