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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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api shield cloudflare firewall rules docs 15 captures 25 nov 2020 14 jan 2026 dec jan feb 22 2020 2021 2022 success fail about this capture timestamps the wayback machine http web archive org web 20210122090441 https developers cloudflare com firewall cf firewall rules api shield 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 collapse 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 top a positive security model for apis use cloudflare api shield about api shield cloudflare api shield makes it easy to secure apis with strong client certificate based encryption support includes grpc external link icon open external link based apis which use binary formats such as protocol buffers rather than json a positive security model for apis implementing a positive security model for apis is the most direct way to eliminate credential stuffing attacks and deny access to automated scanning tools the first step towards a positive model is deploying strong authentication such as mutual tls mtls authentication which is not vulnerable to password reuse or sharing mutual tls authentication uses client certificates to ensure that traffic between client and server is bidirectionally secure and trusted it also allows requests that do not authenticate via an identity provider such as internet of things iot devices to demonstrate they can reach a given resource use cloudflare api shield cloudflare api shield simplifies the deployment and enforcement of mtls authentication and is available to all cloudflare plans to protect your application with api shield use this workflow enable mtls external link icon open external link for the hosts you wish to protect with api shield use cloudflare s fully hosted public key infrastructure pki to create a client certificate in the cloudflare dashboard external link icon open external link create cloudflare firewall rules that require api requests to present a valid client certificate the firewall app in the cloudflare dashboard provides a dedicated interface where you can create api shield rules configure your mobile app or iot device external link icon open external link to use your cloudflare issued client certificate important api shield requires cloudflare issued certificates you can use api shield with any fully managed certificate authority ca where cloudflare issues the client certificates if you need to use certificates issued by another ca please reach out to a cloudflare customer success manager when using yubikeys the browser may prompt for unlocking the key due to a problem in yubikey s pkcs 11 library edit on github external link icon open external link updated 18 hours ago