This policy executes after authentication and traffic shaping policies.

Architecture

This policy uses Google Guava cache, which offers a map to send responses. The cache must be enabled through feature flags on the Snaplex.

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policy version to determine if the policy has been updated since the last save. An update to the policy will direct the flow to acquire a new HTTP response and overwrite the existing one.

Limitations

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Each response cache can only contain 85 MB. The policy always returns the response, but any data over the limit renders the payload incomplete.
A response cache is not effective to use for POST and PUT HTTP methods because these operations are meant to alter the state of data, and hence should not be cached.

Parameter Name	Description	Default Value
Label	Required. The name for the API policy.	HTTP Respone Cache
When this policy should be applied	An expression-enabled field that determines the condition to be fulfilled for the API policy to execute. For example, if the value in this field is `request.method == "POST"`, the API policy is executed only if the request method is a POST.	N/A
Cache Interval	The time period of the current cache before it is refreshed.	1
Time Unit	The time unit for the Cache Interval value.	Hour
Use HTTP Request Headers to Create Cache Keys	Enables the use of specific headers to identify a cache.	Unselected
Use HTTP Request Query Parameter to Create Cache Keys	Enables the use of query parameters to identify a cache.	Unselected
Status	Specifies whether the API policy is enabled or disabled.	Enabled

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