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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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cloudflare firewall rules docs 262 captures 15 jul 2019 13 sep 2026 dec jan feb 19 2020 2021 2022 success fail about this capture timestamps the wayback machine http web archive org web 20210119084453 https developers cloudflare com firewall 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 expand 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 expand firewall rules language firewall rules language fields operators grouping symbols values functions known issues and faq 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 welcome firewall rules allow users to create rules that inspect incoming traffic and block challenge log or allow specific requests manage rules learn more edit on github external link icon open external link updated 18 hours ago