Rate limits

X-RateLimit-Limit-Sec:        10
X-RateLimit-Remaining-Sec:    7
X-RateLimit-Reset-Sec:        1
X-RateLimit-Limit-Min:        300
X-RateLimit-Remaining-Min:    288
X-RateLimit-Reset-Min:        43

import asyncio, httpx

async def fetch_with_backoff(client, url, **kw):
    for attempt in range(5):
        r = await client.get(url, **kw)
        if r.status_code != 429:
            return r
        wait = float(r.headers.get("Retry-After", 1.0))
        # Jitter to avoid every client retrying in lockstep.
        await asyncio.sleep(wait + 0.05 * attempt)
    r.raise_for_status()