--- description: How Cloudflare issues challenges through WAF rules, Bot Management, and Bot Fight Mode. title: How Challenges work image: https://developers.cloudflare.com/og-docs.png --- [Skip to content](#main-content) > Documentation Index > Fetch the complete documentation index at: https://developers.cloudflare.com/cloudflare-challenges/llms.txt > Use this file to discover all available pages before exploring further. # How Challenges work Last updated Aug 24, 2026|Copy as Markdown|[View as Markdown](https://docs-durable-objects-instance-replaced-errors.previews.developers.cloudflare.com/cloudflare-challenges/concepts/how-challenges-work/index.md)|[Agent setup](https://docs-durable-objects-instance-replaced-errors.previews.developers.cloudflare.com/agent-setup/) Challenges can be issued in three primary ways depending on which Cloudflare products or features are in use. Each method is designed to balance security with seamless visitor experience. | Product | Challenge type(s) | | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | | [WAF](https://docs-durable-objects-instance-replaced-errors.previews.developers.cloudflare.com/waf/) ([custom rules](https://docs-durable-objects-instance-replaced-errors.previews.developers.cloudflare.com/waf/custom-rules/), [rate limiting rules](https://docs-durable-objects-instance-replaced-errors.previews.developers.cloudflare.com/waf/rate-limiting-rules/), [IP access rules](https://docs-durable-objects-instance-replaced-errors.previews.developers.cloudflare.com/waf/tools/ip-access-rules/)) | [Interstitial Challenge Page](https://docs-durable-objects-instance-replaced-errors.previews.developers.cloudflare.com/cloudflare-challenges/challenge-types/challenge-pages/) | | [Bot Management](https://docs-durable-objects-instance-replaced-errors.previews.developers.cloudflare.com/bots/get-started/bot-management/) | [JavaScript Detections](https://docs-durable-objects-instance-replaced-errors.previews.developers.cloudflare.com/bots/additional-configurations/javascript-detections/) | | [Bot Fight Mode](https://docs-durable-objects-instance-replaced-errors.previews.developers.cloudflare.com/bots/get-started/bot-fight-mode/), [Super Bot Fight Mode](https://docs-durable-objects-instance-replaced-errors.previews.developers.cloudflare.com/bots/get-started/super-bot-fight-mode/) | [Interstitial Challenge Page](https://docs-durable-objects-instance-replaced-errors.previews.developers.cloudflare.com/cloudflare-challenges/challenge-types/challenge-pages/) | | [Turnstile](https://docs-durable-objects-instance-replaced-errors.previews.developers.cloudflare.com/turnstile/) | Embedded widget | | [HTTP DDoS attack protection](https://docs-durable-objects-instance-replaced-errors.previews.developers.cloudflare.com/ddos-protection/managed-rulesets/http/) | Any Challenge | | [Under Attack Mode](https://docs-durable-objects-instance-replaced-errors.previews.developers.cloudflare.com/fundamentals/reference/under-attack-mode/) | [Managed Challenge](https://docs-durable-objects-instance-replaced-errors.previews.developers.cloudflare.com/cloudflare-challenges/challenge-types/challenge-pages/#managed-challenge) | Challenge Pages and Turnstile rely on the same underlying mechanism to issue challenges to your website or application's visitors. JavaScript Detections is an optional feature within [Bot Management](https://docs-durable-objects-instance-replaced-errors.previews.developers.cloudflare.com/bots/get-started/bot-management/). When enabled, Cloudflare injects a JavaScript snippet into HTML responses to gather client-side signals. Unlike Challenge Pages, JavaScript Detections runs on every HTML request without pausing or interrupting the visitor. It populates a pass/fail result (`cf.bot_management.js_detection.passed`) that you can then act on using a [WAF custom rule](https://docs-durable-objects-instance-replaced-errors.previews.developers.cloudflare.com/waf/custom-rules/). For session-level detection that informs when challenges should be applied, refer to [Precursor](https://docs-durable-objects-instance-replaced-errors.previews.developers.cloudflare.com/cloudflare-challenges/precursor/). --- ## Available challenges Refer to the following pages for more information on the different challenge types: * [Interstitial Challenge Pages](https://docs-durable-objects-instance-replaced-errors.previews.developers.cloudflare.com/cloudflare-challenges/challenge-types/challenge-pages/) * [Turnstile](https://docs-durable-objects-instance-replaced-errors.previews.developers.cloudflare.com/cloudflare-challenges/challenge-types/turnstile/) * [JavaScript Detections](https://docs-durable-objects-instance-replaced-errors.previews.developers.cloudflare.com/cloudflare-challenges/challenge-types/javascript-detections/) * [Precursor](https://docs-durable-objects-instance-replaced-errors.previews.developers.cloudflare.com/cloudflare-challenges/precursor/) --- ## Limitations Cloudflare Challenges cannot support the following: * [Browser extensions](https://docs-durable-objects-instance-replaced-errors.previews.developers.cloudflare.com/cloudflare-challenges/reference/supported-browsers/#browser-extensions) that modify the browser's `User-Agent` value or Web APIs such as `Canvas` and `WebGL`. * Implementations where a domain serves a challenge page originally requested for another domain. * Challenge Pages cannot be embedded in cross-origin iframes. * Client software where the solve request of a Managed Challenge comes from a different IP than the original IP a Challenge request was issued to. For example, if you receive the Challenge from one IP and solve it using another IP, the solve is not valid and you may encounter a Challenge loop. Was this helpful? YesNo ## On this page [![](https://docs-durable-objects-instance-replaced-errors.previews.developers.cloudflare.com/_astro/logo.te5VL_aD.svg)Docs](https://docs-durable-objects-instance-replaced-errors.previews.developers.cloudflare.com/) ```json {"@context":"https://schema.org","@type":"TechArticle","@id":"https://developers.cloudflare.com/cloudflare-challenges/concepts/how-challenges-work/#page","headline":"How Challenges work ยท Cloudflare challenges docs","description":"How Cloudflare issues challenges through WAF rules, Bot Management, and Bot Fight Mode.","url":"https://developers.cloudflare.com/cloudflare-challenges/concepts/how-challenges-work/","inLanguage":"en","image":"https://developers.cloudflare.com/og-docs.png","dateModified":"2026-08-24","publisher":{"@type":"Organization","name":"Cloudflare","description":"One platform for your apps, agents, and workforce. 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