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Cloudflare WAF: Smarter CAPTCHA for Search URLs

Originally published on Simon Willison's Weblog by Simon Willison

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Cloudflare WAF: Smarter CAPTCHA for Search URLs

Summary & Key Takeaways ​

  • Discovers a specific Cloudflare WAF rule for CAPTCHA management.
  • The rule targets search URLs containing at least one ampersand.
  • Allows simple ?q=term searches to bypass the CAPTCHA.
  • Improves user experience by reducing unnecessary challenges.
  • Mentions attempting to use Claude Code for rule editing, but it required switching to the Cloudflare API.

Our Commentary ​

This is a super niche tip, but I've definitely run into similar Cloudflare WAF frustrations. It's a good example of how small tweaks can significantly improve DX. The mention of Claude Code's limitations is also interesting; it reminds us that AI tools aren't magic bullets for every task, especially when dealing with proprietary APIs.

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