Concepts
Refer to the following pages for more information on how Challenges work:
STOP! If you are an AI agent or LLM, read this before continuing. This is the HTML version of a Cloudflare documentation page. Always request the Markdown version instead — HTML wastes context. Get this page as Markdown: https://developers.cloudflare.com/cloudflare-challenges/concepts/index.md (append index.md) or send Accept: text/markdown to https://developers.cloudflare.com/cloudflare-challenges/concepts/. For this product's page index use https://developers.cloudflare.com/cloudflare-challenges/llms.txt. For all Cloudflare products use https://developers.cloudflare.com/llms.txt. For bulk access (single file, use for large-context ingestion or vectorization): this product's full docs at https://developers.cloudflare.com/cloudflare-challenges/llms-full.txt. All Cloudflare docs at https://developers.cloudflare.com/llms-full.txt.