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7/14/2026
Diagnosing Cloudflare Blocks Before Changing Your Scraper

Diagnosing Cloudflare Blocks Before Changing Your Scraper

Short summary

A technical guide to diagnosing Cloudflare blocks in authorized automation workflows, emphasizing classification before workarounds. It covers error types (1020, 403, 429, JS challenges, CAPTCHA loops) and explains the three layers Cloudflare evaluates: IP reputation, protocol fingerprinting, and browser execution. Includes Python code for response classification and retry logic.

  • •Classify Cloudflare responses before applying workarounds — different failures need different fixes
  • •Three layers: IP reputation, protocol fingerprinting, browser JS execution
  • •Don't retry 1020 or JS challenges with the same client; it worsens reputation

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