Why does my crawler fail behind Cloudflare protection

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May 12 in Generative AI by anonymous
 • 24,280 points • 66 views

1 answer to this question.

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Cloudflare protection often breaks crawlers  because the site is no longer serving plain content directly , instead cloudflare may insert : 

  1. Bot detection challenges 

  2. Javascript verification 

  3. CAPTCHA checks 

  4. Fingerprint analysis 

  5. Rate limiting

  6. Browser integrity checks

Maybe the cloudflare may technically ‘connect’ but it might not longer receiving the real page .

 It might look like this 

  • HTTP 403

  • Endless redirects

  • Empty html

  • Captcha page 

  • ‘Just a moment ….. ‘

Why this happens is traditional crawler expects or assumes 

Request → HTML page

But the cloudflare protected site behaves more like 

Request

   ↓Bot analysis

   ↓JS challenge / fingerprinting

   ↓Conditional access

If the request doesn't look like browser like then the page may be restricted 


 

answered May 20 by subhashini
 • 1,280 points

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