---
description: Reference information for Cloudflare Challenges, including browsers, languages, and tokens.
title: Reference
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.

# Reference

Last updated Aug 24, 2026|Copy as Markdown|[View as Markdown](https://docs-durable-objects-instance-replaced-errors.previews.developers.cloudflare.com/cloudflare-challenges/reference/index.md)|[Agent setup](https://docs-durable-objects-instance-replaced-errors.previews.developers.cloudflare.com/agent-setup/)

Refer to the following pages for more information about Cloudflare Challenges:

* [Challenge solve rate (CSR)](https://docs-durable-objects-instance-replaced-errors.previews.developers.cloudflare.com/cloudflare-challenges/reference/challenge-solve-rate/)
* [Private Access Tokens (PAT)](https://docs-durable-objects-instance-replaced-errors.previews.developers.cloudflare.com/cloudflare-challenges/reference/private-access-tokens/)
* [Supported browsers](https://docs-durable-objects-instance-replaced-errors.previews.developers.cloudflare.com/cloudflare-challenges/reference/supported-browsers/)
* [Supported languages](https://docs-durable-objects-instance-replaced-errors.previews.developers.cloudflare.com/cloudflare-challenges/reference/supported-languages/)

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":"WebPage","@id":"https://developers.cloudflare.com/cloudflare-challenges/reference/#page","headline":"Reference · Cloudflare challenges docs","description":"Reference information for Cloudflare Challenges, including browsers, languages, and tokens.","url":"https://developers.cloudflare.com/cloudflare-challenges/reference/","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. Build, secure, and scale without managing infrastructure","url":"https://www.cloudflare.com/","sameAs":["https://github.com/cloudflare","https://www.linkedin.com/company/cloudflare","https://x.com/cloudflare"],"logo":{"@type":"ImageObject","url":"https://developers.cloudflare.com/logo.svg"},"address":{"@type":"PostalAddress","streetAddress":"101 Townsend St","addressLocality":"San Francisco","addressRegion":"CA","postalCode":"94107","addressCountry":"US"},"contactPoint":[{"@type":"ContactPoint","contactType":"Customer Support","url":"https://support.cloudflare.com/","availableLanguage":["English"]},{"@type":"ContactPoint","contactType":"Sales","url":"https://www.cloudflare.com/contact/","availableLanguage":["English"]}]},"isPartOf":{"@type":"WebSite","@id":"https://developers.cloudflare.com/#website","name":"Cloudflare Docs","url":"https://developers.cloudflare.com/"}}
```