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[Challenges] Caveats for Transform Rules and custom error pages #20641

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Mar 7, 2025
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[Challenges] Caveats for Transform Rules and custom error pages #20641

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6 changes: 4 additions & 2 deletions src/content/docs/waf/reference/cloudflare-challenges.mdx
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Expand Up @@ -166,11 +166,13 @@ You can customize your favicon by using the HTML snippet below.

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## Custom Content Security Policy not supported
## Caveats for Transform Rules and custom error pages

You cannot set your own Content Security Policy (CSP) and/or Referer-Policy via meta tags or [Transform Rules](/rules/transform/) in challenge pages.

If you are setting a CSP using Transform Rules for your entire website, you should [exclude URI paths starting with `/cdn-cgi/challenge-platform/`](/rules/reference/troubleshooting/#interaction-between-cloudflare-challenges-and-rules-features) in the rule expression to avoid issues with challenges.
Origin headers also cannot be modified for challenge pages.

If you are setting any of these headers using Transform Rules for your entire website, you must prefix the rule with `not (starts_with(http.request.uri.path, "/cdn-cgi/challenge-platform/") or cf.response.error_type in {"managed_challenge" "iuam" "legacy_challenge" "country_challenge"})` in the rule expression to avoid issues with challenges.

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