AWS::CloudFront::CachePolicy CachePolicyConfig - AWS CloudFormation
SyntaxProperties

AWS::CloudFront::CachePolicy CachePolicyConfig

A cache policy configuration.

This configuration determines the following:

  • The values that CloudFront includes in the cache key. These values can include HTTP headers, cookies, and URL query strings. CloudFront uses the cache key to find an object in its cache that it can return to the viewer.

  • The default, minimum, and maximum time to live (TTL) values that you want objects to stay in the CloudFront cache.

The headers, cookies, and query strings that are included in the cache key are also included in requests that CloudFront sends to the origin. CloudFront sends a request when it can't find a valid object in its cache that matches the request's cache key. If you want to send values to the origin but not include them in the cache key, use OriginRequestPolicy.

Syntax

To declare this entity in your AWS CloudFormation template, use the following syntax:

JSON

{
  "Comment" : String,
  "DefaultTTL" : Number,
  "MaxTTL" : Number,
  "MinTTL" : Number,
  "Name" : String,
  "ParametersInCacheKeyAndForwardedToOrigin" : ParametersInCacheKeyAndForwardedToOrigin
}

Properties

Comment

A comment to describe the cache policy. The comment cannot be longer than 128 characters.

Required: No

Type: String

Update requires: No interruption

DefaultTTL

The default amount of time, in seconds, that you want objects to stay in the CloudFront cache before CloudFront sends another request to the origin to see if the object has been updated. CloudFront uses this value as the object's time to live (TTL) only when the origin does not send Cache-Control or Expires headers with the object. For more information, see Managing How Long Content Stays in an Edge Cache (Expiration) in the Amazon CloudFront Developer Guide.

The default value for this field is 86400 seconds (one day). If the value of MinTTL is more than 86400 seconds, then the default value for this field is the same as the value of MinTTL.

Required: Yes

Type: Number

Minimum: 0

Update requires: No interruption

MaxTTL

The maximum amount of time, in seconds, that objects stay in the CloudFront cache before CloudFront sends another request to the origin to see if the object has been updated. CloudFront uses this value only when the origin sends Cache-Control or Expires headers with the object. For more information, see Managing How Long Content Stays in an Edge Cache (Expiration) in the Amazon CloudFront Developer Guide.

The default value for this field is 31536000 seconds (one year). If the value of MinTTL or DefaultTTL is more than 31536000 seconds, then the default value for this field is the same as the value of DefaultTTL.

Required: Yes

Type: Number

Minimum: 0

Update requires: No interruption

MinTTL

The minimum amount of time, in seconds, that you want objects to stay in the CloudFront cache before CloudFront sends another request to the origin to see if the object has been updated. For more information, see Managing How Long Content Stays in an Edge Cache (Expiration) in the Amazon CloudFront Developer Guide.

Required: Yes

Type: Number

Minimum: 0

Update requires: No interruption

Name

A unique name to identify the cache policy.

Required: Yes

Type: String

Update requires: No interruption

ParametersInCacheKeyAndForwardedToOrigin

The HTTP headers, cookies, and URL query strings to include in the cache key. The values included in the cache key are also included in requests that CloudFront sends to the origin.

Required: Yes

Type: ParametersInCacheKeyAndForwardedToOrigin

Update requires: No interruption