Beyond IP: How Cloudflare Detects Proxy-Based Scrapers

Cloudflare's bot protection analyzes TLS handshakes, HTTP/2 frames, header patterns, and JavaScript behavior—not just IP addresses—making proxy rotation alone ineffective for scrapers. Web scraping practitioners must understand that bypassing modern protections requires matching the full behavioral fingerprint of a real browser, not merely changing the source IP. This shift to behavior-based detection has critical implications for anyone developing scrapers or evaluating anti-bot solutions.