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description=Create rules that examine incoming HTTP traffic against a set of powerful filters to block, challenge, log, or allow matching requests.;

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edit rule expressions cloudflare firewall rules docs 10 captures 11 apr 2020 20 may 2023 feb mar apr 02 2020 2021 2022 success fail about this capture timestamps the wayback machine http web archive org web 20210302210324 https developers cloudflare com firewall cf dashboard expression preview editor this app works best with javascript enabled skip to content cloudflare docs logomark cloudflare docs cloudflare firewall logo firewall navigation menu icon open external link cloudflare docs logomark cloudflare docs cloudflare firewall logo firewall dropdown icon firewall menu cloudflare homepage welcome expand about about fields and expressions actions order and priority rules lists api shield collapse manage rules in the dashboard manage rules in the dashboard create edit and delete rules edit rule expressions preview rules expand use rules lists use rules lists manage lists manage list items ip addresses use lists in expressions create an api shield rule expand manage rules via the apis manage rules via the apis expand firewall rules api firewall rules api json object endpoints post example get examples put examples delete examples expand cloudflare filters api cloudflare filters api what is a filter json object endpoints post example get examples put examples delete examples expression validation expand rules lists api rules lists api json object endpoints call sequence expand common use cases common use cases block microsoft exchange autodiscover requests block requests based on ip reputation challenge bad bots exempt partners from hotlink protection require a specific cookie require a valid hmac token require a valid client certificate require specific http headers require specific http ports site administration require known ip addresses stop r u dead yet r u d y attacks update firewall rules for customers or partners expand firewall rules language firewall rules language fields operators grouping symbols values functions expand rulesets beta rulesets beta view rulesets view root rulesets configure root rulesets deploy rulesets expand work with custom rulesets work with custom rulesets create a custom ruleset add rules to a custom ruleset deploy a custom ruleset from your root ruleset expand work with managed rulesets work with managed rulesets deploy a managed ruleset override a managed ruleset expand workflow examples workflow examples set wordpress rules to block enable only joomla rules enable only selected rules deploy a managed ruleset with ruleset category and rule overrides deploy managed and custom rulesets expand rulesets api rulesets api json object endpoints get examples post example put example known issues and faq search icon depiction of a magnifying glass github icon visit firewall on github light theme icon depiction of a sun dark theme icon depiction of a moon set theme to dark d top overview use the expression editor create nested expressions manage rules in the dashboard edit rule expressions overview the expression editor editor is a text only interface for creating firewall rules expressions although it lacks the visual simplicity of the expression builder the expression editor editor supports the entire specification of cloudflare s firewall rules language for example only the expression editor editor supports grouping symbols cloudflare designed the firewall rules language with wireshark display filters external link icon open external link in mind so although there are some subtle differences wireshark users should feel right at home with firewall rules and be able to easily port their existing rules to cloudflare important firewall rules expressions have a 4kb limit this is approximately 4 000 text characters this limit applies whether you use the visual expression builder or edit your expression manually in the expression editor use the expression editor the expression editor is located in the create firewall rule and edit firewall rule panels the editor supports all available firewall rules fields operators and transformation functions it also supports parentheses as grouping symbols to edit an expression in the editor in the firewall rules tab use the create a firewall rule button to create a new rule or click the wrench icon to edit an existing rule the create firewall rule page displays to switch to the expression editor editor in the create firewall rule page click edit expression use the text input to edit your expression to commit your changes click deploy or save as draft to switch from the editor to the expression builder click use expression builder in general you can switch back and forth between the expression builder and the expression editor editor however if you use parentheses to nest expressions in the editor you will not be able to switch to the expression builder because the builder does not support nested expressions create nested expressions a key advantage of the expression editor editor is support for parentheses as grouping symbols which allow you to explicitly group and nest expressions and in turn create highly targeted expressions this example a rule that challenges any visitor who is not from malaysia and tries to access wordpress uri paths only the expression editor editor supports nested expressions such as the one above if you create a rule with nested expressions in the expression editor editor and try to switch to the expression builder a dialog will warn you that the expression is not supported in the builder you will be prompted to discard changes and switch to the expression builder or cancel and continue working in the editor cloudflare validates all expressions before saving them so if your expression is malformed you will receive an error message as shown in this screenshot the expression editor editor supports the entire firewall rules language for a complete listing of supported fields and operators as well as guidance on using grouping symbols see firewall rules language edit on github external link icon open external link updated 15 hours ago