Available settings

These are the settings that you can configure when creating a Cache Response Rule. Because Cache Response Rules execute after Cloudflare receives the origin response, both request and response fields are available for rule matching.

Expression fields

Request fields

Field	Type	Description
`http.cookie`	String	Full cookie header value
`http.host`	String	The HTTP Host header
`http.referer`	String	The HTTP Referer header
`http.user_agent`	String	The HTTP User-Agent header
`http.request.method`	String	The HTTP request method
`http.request.uri`	String	The request URI
`http.request.uri.path`	String	The URI path
`http.request.uri.path.basename`	String	The basename of the URI path
`http.request.uri.path.extension`	String	The file extension from the URI path
`http.request.uri.query`	String	The query string
`http.request.uri.args`	Map	Query string arguments as key-value pairs
`http.request.uri.args.names`	Array	Query string argument names
`http.request.uri.args.values`	Array	Query string argument values
`http.request.full_uri`	String	The full request URI including scheme and host
`http.request.headers`	Map	Request headers as key-value pairs
`http.request.headers.names`	Array	Request header names
`http.request.headers.values`	Array	Request header values
`http.request.cookies`	Map	Parsed cookies as key-value pairs
`http.request.accepted_languages`	Array	Parsed Accept-Language header values

Response fields

Field	Type	Description
`http.response.code`	Integer	The HTTP response status code from the origin
`http.response.headers`	Map	Response headers as key-value pairs
`http.response.headers.names`	Array	Response header names
`http.response.headers.values`	Array	Response header values

If you select the Edit expression option, you can enter any of the above response fields.

Functions

The following functions are available in this phase:

all
any
concat
decode_base64
ends_with
len
lookup_json_integer
lookup_json_string
lower
regex_replace
remove_bytes
remove_query_args
split
starts_with
substring
to_string
upper
url_decode
wildcard_replace

For descriptions of each function, refer to Functions.

Operators

For the full list of operators, refer to Operators.

Available actions

Cache Response Rules support three actions:

Action	Description
`set_cache_settings`	Strip headers (ETags, Set-Cookie, Last-Modified) from the origin response before caching.
`set_cache_tags`	Add, remove, or set cache tags on the response for targeted purging.
`set_cache_control`	Modify Cache-Control header directives in the origin response.

Action: set_cache_settings

Configures settings related to caching on the origin response. The following parameters are available:

Parameter	Type	Description
`strip_etags`	Boolean	Strip ETag headers from the origin response before caching.
`strip_set_cookie`	Boolean	Strip Set-Cookie headers from the origin response before caching.
`strip_last_modified`	Boolean	Strip Last-Modified headers from the origin response before caching.

API information

API action: set_cache_settings.

"action_parameters": {
  "strip_etags": true,
  "strip_set_cookie": true,
  "strip_last_modified": true
}

Refer to Create a rule via API for complete API examples.

Action: set_cache_tags

Modifies the cache tags associated with the response. Cache tags can be used for targeted cache purging.

Parameter	Type	Description
`operation`	String	Required. One of: `add`, `remove`, `set`.
`values`	Array	A list of cache tag strings. Mutually exclusive with `expression`.
`expression`	String	An expression that evaluates to an array of cache tags. Mutually exclusive with `values`.

API information

API action: set_cache_tags.

"action_parameters": {
  "operation": "set",
  "values": ["api-response", "dynamic-content"]
}

"action_parameters": {
  "operation": "add",
  "expression": "split(http.response.headers[\"Surrogate-Keys\"][0], \",\", 1)"
}

Refer to Create a rule via API for complete API examples.

Action: set_cache_control

Modifies Cache-Control header directives in the origin response.

Supported directives

Directives with duration value (seconds):

max-age
s-maxage
stale-if-error
stale-while-revalidate

Directives with optional qualifiers (header names):

private
no-cache

Boolean directives:

no-store
no-transform
must-revalidate
proxy-revalidate
must-understand
public
immutable

Directive configuration

The available parameters depend on the directive type.

Directives with duration value

Applies to max-age, s-maxage, stale-if-error, and stale-while-revalidate.

Parameter	Type	Description
`operation`	String	Required. `set` or `remove`.
`cloudflare_only`	Boolean	When enabled, this setting only affects how Cloudflare caches your content. Your visitors still receive the original directive.
`value`	Integer	Duration in seconds. Required when operation is `set`.

Directives with optional qualifiers

Applies to private and no-cache.

Parameter	Type	Description
`operation`	String	Required. `set` or `remove`.
`cloudflare_only`	Boolean	When enabled, this setting only affects how Cloudflare caches your content. Your visitors still receive the original directive.
`qualifiers`	Array	Optional list of header names to qualify the directive.

Boolean directives

Applies to no-store, no-transform, must-revalidate, proxy-revalidate, must-understand, public, and immutable.

Parameter	Type	Description
`operation`	String	Required. `set` or `remove`.
`cloudflare_only`	Boolean	When enabled, this setting only affects how Cloudflare caches your content. Your visitors still receive the original directive.

API information

API action: set_cache_control.

"action_parameters": {
  "max-age": {
    "operation": "set",
    "value": 3600,
    "cloudflare_only": true
  },
  "stale-if-error": {
    "operation": "remove"
  }
}

Refer to Create a rule via API for complete API examples.