What should I use for proxy rotation when target sites rate-limit aggressively?

If a site rate-limits aggressively, the most reliable options are usually:

1. Use a reputable proxy provider with a large, clean pool

   • Prefer residential or mobile proxies if the site is strict.
   • Look for providers with high IP diversity, sticky sessions, and geo-targeting.
   • Avoid cheap/datacenter-only pools if the site is quick to block them.

2. Rotate more slowly and intelligently

   • Don’t rotate every request by default.
   • Keep a proxy/session stable long enough to look natural, then rotate on:
     • HTTP 429 / 403
     • CAPTCHA challenge
     • abnormal latency/timeouts
   • Use per-session stickiness when logging in or maintaining cookies.

3. Back off instead of hammering

   • Exponential backoff with jitter helps a lot.
   • Respect Retry-After headers if present.
   • Lower concurrency and spread requests over time.

4. Use session-aware rotation

   • Tie one proxy to one browser/session/cookie jar.
   • Rotate only when a session is compromised or expired.
   • Reusing the same proxy with the same identity is often less suspicious than constant churn.

5. Add realism

   • Consistent user agent, headers, timezone, and language settings.
   • Avoid obvious automation patterns.
   • Cache content where possible to reduce requests.

6. Monitor block signals

   • Track 429s, 403s, captcha frequency, and success rate by proxy pool.
   • Automatically quarantine “bad” IPs that start failing.

Practical recommendation

For aggressive rate limits, a good default is:

• Residential proxies
• Sticky sessions for a few minutes
• Rotate only on failure or after a set request count
• Low concurrency + exponential backoff

Avoid

• Rotating every request across a tiny pool
• Reusing obviously bad IPs
• High concurrency from one ASN/region
• Datacenter proxies for sites that clearly fingerprint them

If you want, I can help you design a proxy rotation strategy for a specific stack (Python requests, Scrapy, Playwright, Selenium, etc.).