--- title: Precursor --- [Skip to content](#_top) [API Reference](https://developers.cloudflare.com/api) Copy Markdown Open in **Claude**Open in **ChatGPT**Open in **Cursor** --- **Copy Markdown****View as Markdown** # Precursor ##### [Get Zone Precursor Config](https://developers.cloudflare.com/api/resources/precursor/methods/get) GET/zones/{zone\_id}/precursor ##### [Update Zone Precursor Config](https://developers.cloudflare.com/api/resources/precursor/methods/update) PUT/zones/{zone\_id}/precursor ##### ModelsExpand Collapse

EnforcementRule object {expression, mode, id, 2 more }

expression: string The filter expression that determines which requests the rule matches. maxLength4000 Link to this property

mode: "min-friction"or "max-security" The override mode Precursor applies to requests matching an enforcement rule. Unlike default_mode, this cannot be off.

One of the following: "min-friction" Link to this property "max-security" Link to this property

Link to this property id: optional string The read-only identifier that Cloudflare assigns to the rule. Link to this property description: optional string An informative description of the rule. Link to this property enabled: optional boolean Whether the rule is active. Link to this property

[Link to this property](<#(resource)%20precursor%20%3E%20(model)%20enforcement_rule%20%3E%20(schema)>)

PrecursorConfig object {default\_mode, enforcement\_rules }

Deprecateddefault\_mode: optional "off"or "min-friction"or "max-security" The zone-level Precursor enforcement mode applied to requests that do not match a more specific enforcement rule.

One of the following: "off" Link to this property "min-friction" Link to this property "max-security" Link to this property

Link to this property

Deprecatedenforcement\_rules: optional array of EnforcementRule { expression, mode, id, 2 more } The ordered list of enforcement rules for the zone.

expression: string The filter expression that determines which requests the rule matches. maxLength4000 Link to this property

mode: "min-friction"or "max-security" The override mode Precursor applies to requests matching an enforcement rule. Unlike default_mode, this cannot be off.

One of the following: "min-friction" Link to this property "max-security" Link to this property

Link to this property

[Link to this property](<#(resource)%20precursor%20%3E%20(model)%20precursor_config%20%3E%20(schema)>)