Why Standard HTTP Libraries Are Dead for Web Scraping (And How to Fix It)

Standard HTTP libraries leak deterministic TLS and HTTP/2 signals that modern WAFs use to detect bots.

WAFs compare TLS ClientHello fingerprints and HTTP/2 pseudo-header ordering against claimed User-Agent strings.

The author built a stateless FastAPI sidecar using curl_cffi and curl-impersonate to mimic Chrome TLS/H2 behavior.

The sidecar applies socket timeouts and HTML truncation to mitigate Slowloris and gzip-bomb attacks.