Interface CacheBehavior.Builder

All Superinterfaces:
Buildable, CopyableBuilder<CacheBehavior.Builder,CacheBehavior>, SdkBuilder<CacheBehavior.Builder,CacheBehavior>, SdkPojo
Enclosing class:
CacheBehavior

public static interface CacheBehavior.Builder extends SdkPojo, CopyableBuilder<CacheBehavior.Builder,CacheBehavior>
  • Method Details

    • pathPattern

      CacheBehavior.Builder pathPattern(String pathPattern)

      The pattern (for example, images/*.jpg) that specifies which requests to apply the behavior to. When CloudFront receives a viewer request, the requested path is compared with path patterns in the order in which cache behaviors are listed in the distribution.

      You can optionally include a slash (/) at the beginning of the path pattern. For example, /images/*.jpg. CloudFront behavior is the same with or without the leading /.

      The path pattern for the default cache behavior is * and cannot be changed. If the request for an object does not match the path pattern for any cache behaviors, CloudFront applies the behavior in the default cache behavior.

      For more information, see Path Pattern in the Amazon CloudFront Developer Guide.

      Parameters:
      pathPattern - The pattern (for example, images/*.jpg) that specifies which requests to apply the behavior to. When CloudFront receives a viewer request, the requested path is compared with path patterns in the order in which cache behaviors are listed in the distribution.

      You can optionally include a slash (/) at the beginning of the path pattern. For example, /images/*.jpg. CloudFront behavior is the same with or without the leading / .

      The path pattern for the default cache behavior is * and cannot be changed. If the request for an object does not match the path pattern for any cache behaviors, CloudFront applies the behavior in the default cache behavior.

      For more information, see Path Pattern in the Amazon CloudFront Developer Guide.

      Returns:
      Returns a reference to this object so that method calls can be chained together.
    • targetOriginId

      CacheBehavior.Builder targetOriginId(String targetOriginId)

      The value of ID for the origin that you want CloudFront to route requests to when they match this cache behavior.

      Parameters:
      targetOriginId - The value of ID for the origin that you want CloudFront to route requests to when they match this cache behavior.
      Returns:
      Returns a reference to this object so that method calls can be chained together.
    • trustedSigners

      CacheBehavior.Builder trustedSigners(TrustedSigners trustedSigners)

      We recommend using TrustedKeyGroups instead of TrustedSigners.

      A list of Amazon Web Services account IDs whose public keys CloudFront can use to validate signed URLs or signed cookies.

      When a cache behavior contains trusted signers, CloudFront requires signed URLs or signed cookies for all requests that match the cache behavior. The URLs or cookies must be signed with the private key of a CloudFront key pair in the trusted signer's Amazon Web Services account. The signed URL or cookie contains information about which public key CloudFront should use to verify the signature. For more information, see Serving private content in the Amazon CloudFront Developer Guide.

      Parameters:
      trustedSigners -

      We recommend using TrustedKeyGroups instead of TrustedSigners.

      A list of Amazon Web Services account IDs whose public keys CloudFront can use to validate signed URLs or signed cookies.

      When a cache behavior contains trusted signers, CloudFront requires signed URLs or signed cookies for all requests that match the cache behavior. The URLs or cookies must be signed with the private key of a CloudFront key pair in the trusted signer's Amazon Web Services account. The signed URL or cookie contains information about which public key CloudFront should use to verify the signature. For more information, see Serving private content in the Amazon CloudFront Developer Guide.

      Returns:
      Returns a reference to this object so that method calls can be chained together.
    • trustedSigners

      default CacheBehavior.Builder trustedSigners(Consumer<TrustedSigners.Builder> trustedSigners)

      We recommend using TrustedKeyGroups instead of TrustedSigners.

      A list of Amazon Web Services account IDs whose public keys CloudFront can use to validate signed URLs or signed cookies.

      When a cache behavior contains trusted signers, CloudFront requires signed URLs or signed cookies for all requests that match the cache behavior. The URLs or cookies must be signed with the private key of a CloudFront key pair in the trusted signer's Amazon Web Services account. The signed URL or cookie contains information about which public key CloudFront should use to verify the signature. For more information, see Serving private content in the Amazon CloudFront Developer Guide.

      This is a convenience method that creates an instance of the TrustedSigners.Builder avoiding the need to create one manually via TrustedSigners.builder().

      When the Consumer completes, SdkBuilder.build() is called immediately and its result is passed to trustedSigners(TrustedSigners).

      Parameters:
      trustedSigners - a consumer that will call methods on TrustedSigners.Builder
      Returns:
      Returns a reference to this object so that method calls can be chained together.
      See Also:
    • trustedKeyGroups

      CacheBehavior.Builder trustedKeyGroups(TrustedKeyGroups trustedKeyGroups)

      A list of key groups that CloudFront can use to validate signed URLs or signed cookies.

      When a cache behavior contains trusted key groups, CloudFront requires signed URLs or signed cookies for all requests that match the cache behavior. The URLs or cookies must be signed with a private key whose corresponding public key is in the key group. The signed URL or cookie contains information about which public key CloudFront should use to verify the signature. For more information, see Serving private content in the Amazon CloudFront Developer Guide.

      Parameters:
      trustedKeyGroups - A list of key groups that CloudFront can use to validate signed URLs or signed cookies.

      When a cache behavior contains trusted key groups, CloudFront requires signed URLs or signed cookies for all requests that match the cache behavior. The URLs or cookies must be signed with a private key whose corresponding public key is in the key group. The signed URL or cookie contains information about which public key CloudFront should use to verify the signature. For more information, see Serving private content in the Amazon CloudFront Developer Guide.

      Returns:
      Returns a reference to this object so that method calls can be chained together.
    • trustedKeyGroups

      default CacheBehavior.Builder trustedKeyGroups(Consumer<TrustedKeyGroups.Builder> trustedKeyGroups)

      A list of key groups that CloudFront can use to validate signed URLs or signed cookies.

      When a cache behavior contains trusted key groups, CloudFront requires signed URLs or signed cookies for all requests that match the cache behavior. The URLs or cookies must be signed with a private key whose corresponding public key is in the key group. The signed URL or cookie contains information about which public key CloudFront should use to verify the signature. For more information, see Serving private content in the Amazon CloudFront Developer Guide.

      This is a convenience method that creates an instance of the TrustedKeyGroups.Builder avoiding the need to create one manually via TrustedKeyGroups.builder().

      When the Consumer completes, SdkBuilder.build() is called immediately and its result is passed to trustedKeyGroups(TrustedKeyGroups).

      Parameters:
      trustedKeyGroups - a consumer that will call methods on TrustedKeyGroups.Builder
      Returns:
      Returns a reference to this object so that method calls can be chained together.
      See Also:
    • viewerProtocolPolicy

      CacheBehavior.Builder viewerProtocolPolicy(String viewerProtocolPolicy)

      The protocol that viewers can use to access the files in the origin specified by TargetOriginId when a request matches the path pattern in PathPattern. You can specify the following options:

      • allow-all: Viewers can use HTTP or HTTPS.

      • redirect-to-https: If a viewer submits an HTTP request, CloudFront returns an HTTP status code of 301 (Moved Permanently) to the viewer along with the HTTPS URL. The viewer then resubmits the request using the new URL.

      • https-only: If a viewer sends an HTTP request, CloudFront returns an HTTP status code of 403 (Forbidden).

      For more information about requiring the HTTPS protocol, see Requiring HTTPS Between Viewers and CloudFront in the Amazon CloudFront Developer Guide.

      The only way to guarantee that viewers retrieve an object that was fetched from the origin using HTTPS is never to use any other protocol to fetch the object. If you have recently changed from HTTP to HTTPS, we recommend that you clear your objects' cache because cached objects are protocol agnostic. That means that an edge location will return an object from the cache regardless of whether the current request protocol matches the protocol used previously. For more information, see Managing Cache Expiration in the Amazon CloudFront Developer Guide.

      Parameters:
      viewerProtocolPolicy - The protocol that viewers can use to access the files in the origin specified by TargetOriginId when a request matches the path pattern in PathPattern. You can specify the following options:

      • allow-all: Viewers can use HTTP or HTTPS.

      • redirect-to-https: If a viewer submits an HTTP request, CloudFront returns an HTTP status code of 301 (Moved Permanently) to the viewer along with the HTTPS URL. The viewer then resubmits the request using the new URL.

      • https-only: If a viewer sends an HTTP request, CloudFront returns an HTTP status code of 403 (Forbidden).

      For more information about requiring the HTTPS protocol, see Requiring HTTPS Between Viewers and CloudFront in the Amazon CloudFront Developer Guide.

      The only way to guarantee that viewers retrieve an object that was fetched from the origin using HTTPS is never to use any other protocol to fetch the object. If you have recently changed from HTTP to HTTPS, we recommend that you clear your objects' cache because cached objects are protocol agnostic. That means that an edge location will return an object from the cache regardless of whether the current request protocol matches the protocol used previously. For more information, see Managing Cache Expiration in the Amazon CloudFront Developer Guide.

      Returns:
      Returns a reference to this object so that method calls can be chained together.
      See Also:
    • viewerProtocolPolicy

      CacheBehavior.Builder viewerProtocolPolicy(ViewerProtocolPolicy viewerProtocolPolicy)

      The protocol that viewers can use to access the files in the origin specified by TargetOriginId when a request matches the path pattern in PathPattern. You can specify the following options:

      • allow-all: Viewers can use HTTP or HTTPS.

      • redirect-to-https: If a viewer submits an HTTP request, CloudFront returns an HTTP status code of 301 (Moved Permanently) to the viewer along with the HTTPS URL. The viewer then resubmits the request using the new URL.

      • https-only: If a viewer sends an HTTP request, CloudFront returns an HTTP status code of 403 (Forbidden).

      For more information about requiring the HTTPS protocol, see Requiring HTTPS Between Viewers and CloudFront in the Amazon CloudFront Developer Guide.

      The only way to guarantee that viewers retrieve an object that was fetched from the origin using HTTPS is never to use any other protocol to fetch the object. If you have recently changed from HTTP to HTTPS, we recommend that you clear your objects' cache because cached objects are protocol agnostic. That means that an edge location will return an object from the cache regardless of whether the current request protocol matches the protocol used previously. For more information, see Managing Cache Expiration in the Amazon CloudFront Developer Guide.

      Parameters:
      viewerProtocolPolicy - The protocol that viewers can use to access the files in the origin specified by TargetOriginId when a request matches the path pattern in PathPattern. You can specify the following options:

      • allow-all: Viewers can use HTTP or HTTPS.

      • redirect-to-https: If a viewer submits an HTTP request, CloudFront returns an HTTP status code of 301 (Moved Permanently) to the viewer along with the HTTPS URL. The viewer then resubmits the request using the new URL.

      • https-only: If a viewer sends an HTTP request, CloudFront returns an HTTP status code of 403 (Forbidden).

      For more information about requiring the HTTPS protocol, see Requiring HTTPS Between Viewers and CloudFront in the Amazon CloudFront Developer Guide.

      The only way to guarantee that viewers retrieve an object that was fetched from the origin using HTTPS is never to use any other protocol to fetch the object. If you have recently changed from HTTP to HTTPS, we recommend that you clear your objects' cache because cached objects are protocol agnostic. That means that an edge location will return an object from the cache regardless of whether the current request protocol matches the protocol used previously. For more information, see Managing Cache Expiration in the Amazon CloudFront Developer Guide.

      Returns:
      Returns a reference to this object so that method calls can be chained together.
      See Also:
    • allowedMethods

      CacheBehavior.Builder allowedMethods(AllowedMethods allowedMethods)
      Sets the value of the AllowedMethods property for this object.
      Parameters:
      allowedMethods - The new value for the AllowedMethods property for this object.
      Returns:
      Returns a reference to this object so that method calls can be chained together.
    • allowedMethods

      default CacheBehavior.Builder allowedMethods(Consumer<AllowedMethods.Builder> allowedMethods)
      Sets the value of the AllowedMethods property for this object. This is a convenience method that creates an instance of the AllowedMethods.Builder avoiding the need to create one manually via AllowedMethods.builder().

      When the Consumer completes, SdkBuilder.build() is called immediately and its result is passed to allowedMethods(AllowedMethods).

      Parameters:
      allowedMethods - a consumer that will call methods on AllowedMethods.Builder
      Returns:
      Returns a reference to this object so that method calls can be chained together.
      See Also:
    • smoothStreaming

      CacheBehavior.Builder smoothStreaming(Boolean smoothStreaming)

      Indicates whether you want to distribute media files in the Microsoft Smooth Streaming format using the origin that is associated with this cache behavior. If so, specify true; if not, specify false. If you specify true for SmoothStreaming, you can still distribute other content using this cache behavior if the content matches the value of PathPattern.

      Parameters:
      smoothStreaming - Indicates whether you want to distribute media files in the Microsoft Smooth Streaming format using the origin that is associated with this cache behavior. If so, specify true; if not, specify false. If you specify true for SmoothStreaming, you can still distribute other content using this cache behavior if the content matches the value of PathPattern.
      Returns:
      Returns a reference to this object so that method calls can be chained together.
    • compress

      CacheBehavior.Builder compress(Boolean compress)

      Whether you want CloudFront to automatically compress certain files for this cache behavior. If so, specify true; if not, specify false. For more information, see Serving Compressed Files in the Amazon CloudFront Developer Guide.

      Parameters:
      compress - Whether you want CloudFront to automatically compress certain files for this cache behavior. If so, specify true; if not, specify false. For more information, see Serving Compressed Files in the Amazon CloudFront Developer Guide.
      Returns:
      Returns a reference to this object so that method calls can be chained together.
    • lambdaFunctionAssociations

      CacheBehavior.Builder lambdaFunctionAssociations(LambdaFunctionAssociations lambdaFunctionAssociations)

      A complex type that contains zero or more Lambda@Edge function associations for a cache behavior.

      Parameters:
      lambdaFunctionAssociations - A complex type that contains zero or more Lambda@Edge function associations for a cache behavior.
      Returns:
      Returns a reference to this object so that method calls can be chained together.
    • lambdaFunctionAssociations

      default CacheBehavior.Builder lambdaFunctionAssociations(Consumer<LambdaFunctionAssociations.Builder> lambdaFunctionAssociations)

      A complex type that contains zero or more Lambda@Edge function associations for a cache behavior.

      This is a convenience method that creates an instance of the LambdaFunctionAssociations.Builder avoiding the need to create one manually via LambdaFunctionAssociations.builder().

      When the Consumer completes, SdkBuilder.build() is called immediately and its result is passed to lambdaFunctionAssociations(LambdaFunctionAssociations).

      Parameters:
      lambdaFunctionAssociations - a consumer that will call methods on LambdaFunctionAssociations.Builder
      Returns:
      Returns a reference to this object so that method calls can be chained together.
      See Also:
    • functionAssociations

      CacheBehavior.Builder functionAssociations(FunctionAssociations functionAssociations)

      A list of CloudFront functions that are associated with this cache behavior. CloudFront functions must be published to the LIVE stage to associate them with a cache behavior.

      Parameters:
      functionAssociations - A list of CloudFront functions that are associated with this cache behavior. CloudFront functions must be published to the LIVE stage to associate them with a cache behavior.
      Returns:
      Returns a reference to this object so that method calls can be chained together.
    • functionAssociations

      default CacheBehavior.Builder functionAssociations(Consumer<FunctionAssociations.Builder> functionAssociations)

      A list of CloudFront functions that are associated with this cache behavior. CloudFront functions must be published to the LIVE stage to associate them with a cache behavior.

      This is a convenience method that creates an instance of the FunctionAssociations.Builder avoiding the need to create one manually via FunctionAssociations.builder().

      When the Consumer completes, SdkBuilder.build() is called immediately and its result is passed to functionAssociations(FunctionAssociations).

      Parameters:
      functionAssociations - a consumer that will call methods on FunctionAssociations.Builder
      Returns:
      Returns a reference to this object so that method calls can be chained together.
      See Also:
    • fieldLevelEncryptionId

      CacheBehavior.Builder fieldLevelEncryptionId(String fieldLevelEncryptionId)

      The value of ID for the field-level encryption configuration that you want CloudFront to use for encrypting specific fields of data for this cache behavior.

      Parameters:
      fieldLevelEncryptionId - The value of ID for the field-level encryption configuration that you want CloudFront to use for encrypting specific fields of data for this cache behavior.
      Returns:
      Returns a reference to this object so that method calls can be chained together.
    • realtimeLogConfigArn

      CacheBehavior.Builder realtimeLogConfigArn(String realtimeLogConfigArn)

      The Amazon Resource Name (ARN) of the real-time log configuration that is attached to this cache behavior. For more information, see Real-time logs in the Amazon CloudFront Developer Guide.

      Parameters:
      realtimeLogConfigArn - The Amazon Resource Name (ARN) of the real-time log configuration that is attached to this cache behavior. For more information, see Real-time logs in the Amazon CloudFront Developer Guide.
      Returns:
      Returns a reference to this object so that method calls can be chained together.
    • cachePolicyId

      CacheBehavior.Builder cachePolicyId(String cachePolicyId)

      The unique identifier of the cache policy that is attached to this cache behavior. For more information, see Creating cache policies or Using the managed cache policies in the Amazon CloudFront Developer Guide.

      A CacheBehavior must include either a CachePolicyId or ForwardedValues . We recommend that you use a CachePolicyId.

      Parameters:
      cachePolicyId - The unique identifier of the cache policy that is attached to this cache behavior. For more information, see Creating cache policies or Using the managed cache policies in the Amazon CloudFront Developer Guide.

      A CacheBehavior must include either a CachePolicyId or ForwardedValues. We recommend that you use a CachePolicyId.

      Returns:
      Returns a reference to this object so that method calls can be chained together.
    • originRequestPolicyId

      CacheBehavior.Builder originRequestPolicyId(String originRequestPolicyId)

      The unique identifier of the origin request policy that is attached to this cache behavior. For more information, see Creating origin request policies or Using the managed origin request policies in the Amazon CloudFront Developer Guide.

      Parameters:
      originRequestPolicyId - The unique identifier of the origin request policy that is attached to this cache behavior. For more information, see Creating origin request policies or Using the managed origin request policies in the Amazon CloudFront Developer Guide.
      Returns:
      Returns a reference to this object so that method calls can be chained together.
    • responseHeadersPolicyId

      CacheBehavior.Builder responseHeadersPolicyId(String responseHeadersPolicyId)

      The identifier for a response headers policy.

      Parameters:
      responseHeadersPolicyId - The identifier for a response headers policy.
      Returns:
      Returns a reference to this object so that method calls can be chained together.
    • forwardedValues

      @Deprecated CacheBehavior.Builder forwardedValues(ForwardedValues forwardedValues)
      Deprecated.

      This field is deprecated. We recommend that you use a cache policy or an origin request policy instead of this field. For more information, see Working with policies in the Amazon CloudFront Developer Guide.

      If you want to include values in the cache key, use a cache policy. For more information, see Creating cache policies or Using the managed cache policies in the Amazon CloudFront Developer Guide.

      If you want to send values to the origin but not include them in the cache key, use an origin request policy. For more information, see Creating origin request policies or Using the managed origin request policies in the Amazon CloudFront Developer Guide.

      A CacheBehavior must include either a CachePolicyId or ForwardedValues . We recommend that you use a CachePolicyId.

      A complex type that specifies how CloudFront handles query strings, cookies, and HTTP headers.

      Parameters:
      forwardedValues - This field is deprecated. We recommend that you use a cache policy or an origin request policy instead of this field. For more information, see Working with policies in the Amazon CloudFront Developer Guide.

      If you want to include values in the cache key, use a cache policy. For more information, see Creating cache policies or Using the managed cache policies in the Amazon CloudFront Developer Guide.

      If you want to send values to the origin but not include them in the cache key, use an origin request policy. For more information, see Creating origin request policies or Using the managed origin request policies in the Amazon CloudFront Developer Guide.

      A CacheBehavior must include either a CachePolicyId or ForwardedValues. We recommend that you use a CachePolicyId.

      A complex type that specifies how CloudFront handles query strings, cookies, and HTTP headers.

      Returns:
      Returns a reference to this object so that method calls can be chained together.
    • forwardedValues

      @Deprecated default CacheBehavior.Builder forwardedValues(Consumer<ForwardedValues.Builder> forwardedValues)
      Deprecated.

      This field is deprecated. We recommend that you use a cache policy or an origin request policy instead of this field. For more information, see Working with policies in the Amazon CloudFront Developer Guide.

      If you want to include values in the cache key, use a cache policy. For more information, see Creating cache policies or Using the managed cache policies in the Amazon CloudFront Developer Guide.

      If you want to send values to the origin but not include them in the cache key, use an origin request policy. For more information, see Creating origin request policies or Using the managed origin request policies in the Amazon CloudFront Developer Guide.

      A CacheBehavior must include either a CachePolicyId or ForwardedValues . We recommend that you use a CachePolicyId.

      A complex type that specifies how CloudFront handles query strings, cookies, and HTTP headers.

      This is a convenience method that creates an instance of the ForwardedValues.Builder avoiding the need to create one manually via ForwardedValues.builder().

      When the Consumer completes, SdkBuilder.build() is called immediately and its result is passed to forwardedValues(ForwardedValues).

      Parameters:
      forwardedValues - a consumer that will call methods on ForwardedValues.Builder
      Returns:
      Returns a reference to this object so that method calls can be chained together.
      See Also:
    • minTTL

      Deprecated.

      This field is deprecated. We recommend that you use the MinTTL field in a cache policy instead of this field. For more information, see Creating cache policies or Using the managed cache policies in the Amazon CloudFront Developer Guide.

      The minimum amount of time that you want objects to stay in CloudFront caches before CloudFront forwards another request to your origin to determine whether 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.

      You must specify 0 for MinTTL if you configure CloudFront to forward all headers to your origin (under Headers, if you specify 1 for Quantity and * for Name).

      Parameters:
      minTTL - This field is deprecated. We recommend that you use the MinTTL field in a cache policy instead of this field. For more information, see Creating cache policies or Using the managed cache policies in the Amazon CloudFront Developer Guide.

      The minimum amount of time that you want objects to stay in CloudFront caches before CloudFront forwards another request to your origin to determine whether 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.

      You must specify 0 for MinTTL if you configure CloudFront to forward all headers to your origin (under Headers, if you specify 1 for Quantity and * for Name).

      Returns:
      Returns a reference to this object so that method calls can be chained together.
    • defaultTTL

      @Deprecated CacheBehavior.Builder defaultTTL(Long defaultTTL)
      Deprecated.

      This field is deprecated. We recommend that you use the DefaultTTL field in a cache policy instead of this field. For more information, see Creating cache policies or Using the managed cache policies in the Amazon CloudFront Developer Guide.

      The default amount of time that you want objects to stay in CloudFront caches before CloudFront forwards another request to your origin to determine whether the object has been updated. The value that you specify applies only when your origin does not add HTTP headers such as Cache-Control max-age, Cache-Control s-maxage, and Expires to objects. For more information, see Managing How Long Content Stays in an Edge Cache (Expiration) in the Amazon CloudFront Developer Guide.

      Parameters:
      defaultTTL - This field is deprecated. We recommend that you use the DefaultTTL field in a cache policy instead of this field. For more information, see Creating cache policies or Using the managed cache policies in the Amazon CloudFront Developer Guide.

      The default amount of time that you want objects to stay in CloudFront caches before CloudFront forwards another request to your origin to determine whether the object has been updated. The value that you specify applies only when your origin does not add HTTP headers such as Cache-Control max-age, Cache-Control s-maxage, and Expires to objects. For more information, see Managing How Long Content Stays in an Edge Cache (Expiration) in the Amazon CloudFront Developer Guide.

      Returns:
      Returns a reference to this object so that method calls can be chained together.
    • maxTTL

      Deprecated.

      This field is deprecated. We recommend that you use the MaxTTL field in a cache policy instead of this field. For more information, see Creating cache policies or Using the managed cache policies in the Amazon CloudFront Developer Guide.

      The maximum amount of time that you want objects to stay in CloudFront caches before CloudFront forwards another request to your origin to determine whether the object has been updated. The value that you specify applies only when your origin adds HTTP headers such as Cache-Control max-age, Cache-Control s-maxage, and Expires to objects. For more information, see Managing How Long Content Stays in an Edge Cache (Expiration) in the Amazon CloudFront Developer Guide.

      Parameters:
      maxTTL - This field is deprecated. We recommend that you use the MaxTTL field in a cache policy instead of this field. For more information, see Creating cache policies or Using the managed cache policies in the Amazon CloudFront Developer Guide.

      The maximum amount of time that you want objects to stay in CloudFront caches before CloudFront forwards another request to your origin to determine whether the object has been updated. The value that you specify applies only when your origin adds HTTP headers such as Cache-Control max-age, Cache-Control s-maxage, and Expires to objects. For more information, see Managing How Long Content Stays in an Edge Cache (Expiration) in the Amazon CloudFront Developer Guide.

      Returns:
      Returns a reference to this object so that method calls can be chained together.