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Policies

Caching

Respond to matched incoming requests with cached content

Configuration#

{
  "name": "my-caching-inbound-policy",
  "policyType": "caching-inbound",
  "handler": {
    "export": "CachingInboundPolicy",
    "module": "$import(@zuplo/runtime)",
    "options": {
      "expirationSecondsTtl": 60,
      "dangerouslyIgnoreAuthorizationHeader": false,
      "headers": [
        "header_used_as_part_of_cache_key"
      ],
      "cacheHttpMethods": [
        "GET"
      ]
    }
  }
}

Options#

  • name the name of your policy instance. This is used as a reference in your routes.
  • policyType the identifier of the policy. This is used by the Zuplo UI. Value should be caching-inbound.
  • handler/export The name of the exported type. Value should be CachingInboundPolicy.
  • handler/module the module containing the policy. Value should be $import(@zuplo/runtime).
  • handler/options The options for this policy:
    • cacheId

      Optional, specifies an id or 'key' for this policy to store cache. This is useful for cache-busting. For example, set this property to an env var and if you change that env var value, you invalidate the cache.

    • dangerouslyIgnoreAuthorizationHeader

      By default, the Authorization header is always considered in the caching policy. You can disable by setting this to true

    • headers

      The headers to be considered when caching

    • cacheHttpMethods

      HTTP Methods to be cached - defaults to GET if none specified. Valid methods are: GET, POST, PUT, PATCH, DELETE, HEAD

    • expirationSecondsTtl

      The timeout of the cache in seconds

    • statusCodes

      Response status codes to be cached - defaults to 200, 206, 301, 302, 303, 404, 410 if none specified

Cache-busting

If you need to support cache-busting on demand, we recommend applying a cacheId property based on an Environment Variable. Ensure all your cache policies are using a cachedId based on a variable and then change that variable (and trigger a redeploy) to clear the cache.

e.g.

{
  "export": "CachingInboundPolicy",
  "module": "$import(@zuplo/runtime)",
  "options": {
    "cachedId": "$env(CACHE_ID)", // this is reading an env var
    "expirationSecondsTtl": 60,
    "dangerouslyIgnoreAuthorizationHeader": false,
    "headers": ["header_used_as_part_of_cache_key"]
  }
}

Then you would setup an env var for this, we recommend using the current date it was set, e.g. 2023-07-05-11-57 and then simply change this value and trigger a redeploy to bust your cache.

Env Var

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