unclecode 72b546c48d Add anti-bot detection, retry, and fallback system ...

Automatically detect when crawls are blocked by anti-bot systems
(Akamai, Cloudflare, PerimeterX, DataDome, Imperva, etc.) and
escalate through configurable retry and fallback strategies.

New features on CrawlerRunConfig:
- max_retries: retry rounds when blocking is detected
- fallback_proxy_configs: list of fallback proxies tried each round
- fallback_fetch_function: async last-resort function returning raw HTML

New field on ProxyConfig:
- is_fallback: skip proxy on first attempt, activate only when blocked

Escalation chain per round: main proxy → fallback proxies in order.
After all rounds: fallback_fetch_function as last resort.

Detection uses tiered heuristics — structural HTML markers (high
confidence) trigger on any page, generic patterns only on short
error pages to avoid false positives.

2026-02-14 05:24:07 +00:00

4.5 KiB

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