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Rules language


Last updated Apr 16, 2026|Copy as Markdown|View as Markdown|Agent setup




The Cloudflare Rules language is a flexible and intuitive specification for building rule expressions. Based on the widely known Wireshark display filters ↗, the Rules language allows you to precisely target HTTP requests with a syntax and semantics familiar to security engineers.

Refer to the following pages for more information about the available language elements:

Expressions

Operators and grouping symbols

Values

Actions

Fields

Functions


PreviousDeploy a custom rulesetNextOverview


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