downstream

Version: `v2023-09-20`	Includes use: Yes

Behavior name: Downstream Cacheability

Specify the caching instructions the edge server sends to the end user's client or client proxies. By default, the cache's duration is whichever is less: the remaining lifetime of the edge cache, or what the origin's header specifies. If the origin is set to no-store or bypass-cache edge servers send cache-busting headers downstream to prevent downstream caching.

data "akamai_property_rules_builder" "downstream_cache" {
  rules_v2023_09_20 {
    name     = "Downstream Cacheability"
    comments = "Specify the caching instructions the edge server sends to an end user's client or client proxies."
    behavior {
      downstream_cache {
        behavior       = "ALLOW"
        allow_behavior = "LESSER"
        send_headers   = "CACHE_CONTROL_AND_EXPIRES"
        send_private   = false
      }
    }
  }
}

"behaviors": [
  {
    "name": "downstreamCache",
    "options": {
      "behavior": "ALLOW",
      "allowBehavior": "LESSER",
      "sendHeaders": "CACHE_CONTROL_AND_EXPIRES",
      "sendPrivate": false
    }
  }
]

Options

Option	Description
`behavior`	Enum Specify the caching instructions the edge server sends to the end user's client. Value is one of: `ALLOW`. The value of `allow_behavior` chooses the caching method and headers to send to the client. `MUST_REVALIDATE`. This equates to a `Cache-Control: no-cache` header, which allows caching but forces the client browser to send an `if-modified-since` request each time it requests the object. `BUST`. Sends cache-busting headers downstream. `TUNNEL_ORIGIN`. This passes `Cache-Control` and `Expires` headers from the origin to the downstream client. `NONE`. Don't send any caching headers. Allow client browsers to cache content according to their own default settings.
`allow_behavior`	Enum \| Requires: `behavior` is `ALLOW` Specify how the edge server calculates the downstream cache by setting the value of the `Expires` header. Value is one of: `LESSER`. Sends the lesser value of what the origin specifies and the edge cache's remaining duration. This is the default behavior. `GREATER`. Sends the greater value of what the origin specifies and the edge cache's remaining duration. `REMAINING_LIFETIME`. Sends the value of the edge cache's remaining duration, without comparing it to the origin's headers. `FROM_MAX_AGE`. Sends the `cache:max-age` value applied to the object, without evaluating the cache's duration. `FROM_VALUE`. Sends the value of the edge cache's duration. `PASS_ORIGIN`. Sends the value of the origin's header, without evaluating the edge cache's duration.
`ttl`	String \| Requires: `allow_behavior` is `FROM_VALUE` Sets the duration of the cache. Setting the value to `0` equates to a `no-cache` header that forces revalidation.
`send_headers`	Enum \| Requires: `behavior` is `ALLOW` Specifies the HTTP headers to include in the response to the client. Value is one of: `CACHE_CONTROL_AND_EXPIRES`. Sends both `Cache-Control` and `Expires` header. `CACHE_CONTROL`. Sends only the origin's `Cache-Control` header. `EXPIRES`. Sends only the origin's `Expires` header. `PASS_ORIGIN`. Sends the same set of `Cache-Control` and `Expires` headers received from the origin.
`send_private`	Boolean \| Requires Requires these aren't `EXPIRES`: `ALLOW` `MUST_REVALIDATE` `send_headers` Adds a `Cache-Control: private` header to prevent objects from being cached in a shared caching proxy.