--- title: Update Zone Precursor Config --- [Skip to content](#_top) [API Reference](https://developers.cloudflare.com/api/python) [Precursor](https://developers.cloudflare.com/api/python/resources/precursor) Copy Markdown Open in **Claude**Open in **ChatGPT**Open in **Cursor** --- **Copy Markdown****View as Markdown** # Update Zone Precursor Config precursor.update(PrecursorUpdateParams\*\*kwargs) -> [PrecursorConfig]() PUT/zones/{zone\_id}/precursor Updates the Precursor configuration for a zone. `default_mode` sets the zone-level enforcement mode. `enforcement_rules` is the ordered list of rules that override enforcement for matching requests. This is a partial update: only the fields present in the request body are changed. - Sending an empty array ( `[]`) clears all enforcement rules. - At least one of `default_mode` or `enforcement_rules` must be present; an empty body ( `{}`) is rejected with `400`. - Rule `id` is read-only (assigned by Cloudflare) and ignored on input. - Rule `mode` must be `min-friction` or `max-security` ( `off` is not a valid rule mode; use `default_mode` to disable enforcement). - Rule `expression` is limited to 4000 characters. The limit applies to each rule individually, not to the combined size of all rules. ##### Security

API Token

The preferred authorization scheme for interacting with the Cloudflare API. Create a token. **Example:**Authorization: Bearer Sn3lZJTBX6kkg7OdcBUAxOO963GEIyGQqnFTOFYY

API Email + API Key

The previous authorization scheme for interacting with the Cloudflare API, used in conjunction with a Global API key. **Example:**X-Auth-Email: user@example.com The previous authorization scheme for interacting with the Cloudflare API. When possible, use API tokens instead of Global API keys. **Example:**X-Auth-Key: 144c9defac04969c7bfad8efaa8ea194

##### ParametersExpand Collapse zone\_id: str Identifier. maxLength32 [Link to this property](<#(resource)%20precursor%20%3E%20(method)%20update%20%3E%20(params)%20default%20%3E%20(param)%20zone_id%20%3E%20(schema)>)

Deprecateddefault\_mode: Optional\[Literal\["off", "min-friction", "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](<#(resource)%20precursor%20%3E%20(method)%20update%20%3E%20(params)%20default%20%3E%20(param)%20default_mode%20%3E%20(schema)>)

Deprecatedenforcement\_rules: Optional\[Iterable\[EnforcementRuleParam]] The ordered list of enforcement rules for the zone.

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

mode: Literal\["min-friction", "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\[str] The read-only identifier that Cloudflare assigns to the rule. Link to this property description: Optional\[str] An informative description of the rule. Link to this property enabled: Optional\[bool] Whether the rule is active. Link to this property

[Link to this property](<#(resource)%20precursor%20%3E%20(method)%20update%20%3E%20(params)%20default%20%3E%20(param)%20enforcement_rules%20%3E%20(schema)>) ##### ReturnsExpand Collapse

class PrecursorConfig: …

Deprecateddefault\_mode: Optional\[Literal\["off", "min-friction", "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\[List\[EnforcementRule]] The ordered list of enforcement rules for the zone.

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

mode: Literal\["min-friction", "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)>) ### Update Zone Precursor Config Python HTTPTypeScriptPythonGoTerraform ``` import os from cloudflare import Cloudflare client = Cloudflare( api_token=os.environ.get("CLOUDFLARE_API_TOKEN"), # This is the default and can be omitted ) precursor_config = client.precursor.update( zone_id="023e105f4ecef8ad9ca31a8372d0c353", default_mode="min-friction", ) print(precursor_config.default_mode) ``` 200 example ``` { "errors": [ { "code": 1000, "message": "message", "documentation_url": "documentation_url", "source": { "pointer": "pointer" } } ], "messages": [ { "code": 1000, "message": "message", "documentation_url": "documentation_url", "source": { "pointer": "pointer" } } ], "success": true, "result": { "default_mode": "min-friction", "enforcement_rules": [ { "expression": "http.request.uri.path eq \"/shop\"", "mode": "max-security", "id": "3a03d665bac043e3a684e0d385a4b1e2", "description": "Enforce max-security on the shop page", "enabled": true } ] } } ``` ##### Returns Examples 200 example ``` { "errors": [ { "code": 1000, "message": "message", "documentation_url": "documentation_url", "source": { "pointer": "pointer" } } ], "messages": [ { "code": 1000, "message": "message", "documentation_url": "documentation_url", "source": { "pointer": "pointer" } } ], "success": true, "result": { "default_mode": "min-friction", "enforcement_rules": [ { "expression": "http.request.uri.path eq \"/shop\"", "mode": "max-security", "id": "3a03d665bac043e3a684e0d385a4b1e2", "description": "Enforce max-security on the shop page", "enabled": true } ] } } ```