fetchlib

【部署与运维】A compliance-first page-fetch waterfall for the repo's scraping skills: tiered backends that escalate only when the current tier is genuinely blocked — L1 curl_cffi (TLS/JA3 impersonation, no JS) → L2 r.jina.ai (JS render to clean markdown) → L3 pluggable nodriver/browser → L4 opt-in paid unblocker — wrapped in api-pacer + AIMD per-domain rate contro…

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