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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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preview rules cloudflare firewall rules docs 32 captures 11 apr 2020 20 may 2026 feb mar apr 01 2020 2021 2022 success fail about this capture timestamps the wayback machine http web archive org web 20210301011316 https developers cloudflare com firewall cf dashboard rule preview 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 manage rules in the dashboard preview rules overview cloudflare firewall rules provides a powerful and flexible platform for filtering http requests and protecting your site amid an evolving threat landscape however the same power and flexibility that allows you to tailor firewall rules to your specific application and environment can also introduce complexity in these cases it is critical that you have a way to test a firewall rule before deploying it so that you can ensure the rule will behave the way you expect to help customers understand the potential impact of a rule cloudflare has built rule preview with the click of a button rule preview allows you to test a firewall rule against a sample drawn from the last 72 hours of traffic rule preview is built into the firewall rules expression editor so that you can test a rule as you edit it important rule preview requires access to an cloudflare enterprise plan use rule preview to test a firewall rule with rule preview locate the desired rule in the rules list and click the associated edit button wrench icon the edit firewall rule panel will open click test rule to trigger the test the results of the test are displayed in a plot that simulates how many of the total requests in the last 72 hours would have matched the tested expression in this screenshot a rule that matches all user agents that contain the string mozilla would block about 8 of requests to the zone important notes consider the results of firewall preview an indication of traffic levels not an exact calculation the sample rate can be as little as 1 of your total traffic rule preview does not take into account other cloudflare firewall rules that you have already configured in effect rule preview tests a single firewall rule in isolation firewall events or any other rules with a higher priority that may have blocked or challenged a request are ignored cloudflare does not store the entirety of requests so only a limited number of fields are available to rule preview the table below lists the fields that rule preview supports green cells broken down by operator fields and operators that are not supported are not included in this table equal not equal greater than less than greater than or equal less than or equal in contains as number ip geoip asnum country ip geoip country hostname http host ip address ip src referer http referer request method http request method ssl ssl uri http request uri uri path http request uri path uri query string http request uri query user agent http user_agent edit on github external link icon open external link updated 15 hours ago