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Amazon CloudFront

This is the Amazon CloudFront API Reference. This guide is for developers who need detailed information about CloudFront API actions, data types, and errors. For detailed information about CloudFront features, see the Amazon CloudFront Developer Guide.

If you’re using the service, you’re probably looking for CloudFrontClient and CloudFront.

Structs

A list of key groups, and the public keys in each key group, that CloudFront can use to verify the signatures of signed URLs and signed cookies.

A list of AWS accounts and the active CloudFront key pairs in each account that CloudFront can use to verify the signatures of signed URLs and signed cookies.

AWS services in China customers must file for an Internet Content Provider (ICP) recordal if they want to serve content publicly on an alternate domain name, also known as a CNAME, that they've added to CloudFront. AliasICPRecordal provides the ICP recordal status for CNAMEs associated with distributions. The status is returned in the CloudFront response; you can't configure it yourself.

For more information about ICP recordals, see Signup, Accounts, and Credentials in Getting Started with AWS services in China.

A complex type that contains information about CNAMEs (alternate domain names), if any, for this distribution.

A complex type that controls which HTTP methods CloudFront processes and forwards to your Amazon S3 bucket or your custom origin. There are three choices:

  • CloudFront forwards only GET and HEAD requests.

  • CloudFront forwards only GET, HEAD, and OPTIONS requests.

  • CloudFront forwards GET, HEAD, OPTIONS, PUT, PATCH, POST, and DELETE requests.

If you pick the third choice, you may need to restrict access to your Amazon S3 bucket or to your custom origin so users can't perform operations that you don't want them to. For example, you might not want users to have permissions to delete objects from your origin.

A complex type that describes how CloudFront processes requests.

You must create at least as many cache behaviors (including the default cache behavior) as you have origins if you want CloudFront to serve objects from all of the origins. Each cache behavior specifies the one origin from which you want CloudFront to get objects. If you have two origins and only the default cache behavior, the default cache behavior will cause CloudFront to get objects from one of the origins, but the other origin is never used.

For the current quota (formerly known as limit) on the number of cache behaviors that you can add to a distribution, see Quotas in the Amazon CloudFront Developer Guide.

If you don’t want to specify any cache behaviors, include only an empty CacheBehaviors element. Don’t include an empty CacheBehavior element because this is invalid.

To delete all cache behaviors in an existing distribution, update the distribution configuration and include only an empty CacheBehaviors element.

To add, change, or remove one or more cache behaviors, update the distribution configuration and specify all of the cache behaviors that you want to include in the updated distribution.

For more information about cache behaviors, see Cache Behavior Settings in the Amazon CloudFront Developer Guide.

A complex type that contains zero or more CacheBehavior elements.

A cache policy.

When it’s attached to a cache behavior, the cache policy 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 automatically 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.

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 automatically 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.

An object that determines whether any cookies in viewer requests (and if so, which cookies) are included in the cache key and automatically included in requests that CloudFront sends to the origin.

An object that determines whether any HTTP headers (and if so, which headers) are included in the cache key and automatically included in requests that CloudFront sends to the origin.

A list of cache policies.

An object that determines whether any URL query strings in viewer requests (and if so, which query strings) are included in the cache key and automatically included in requests that CloudFront sends to the origin.

Contains a cache policy.

A complex type that controls whether CloudFront caches the response to requests using the specified HTTP methods. There are two choices:

  • CloudFront caches responses to GET and HEAD requests.

  • CloudFront caches responses to GET, HEAD, and OPTIONS requests.

If you pick the second choice for your Amazon S3 Origin, you may need to forward Access-Control-Request-Method, Access-Control-Request-Headers, and Origin headers for the responses to be cached correctly.

A client for the CloudFront API.

CloudFront origin access identity.

Origin access identity configuration. Send a GET request to the /CloudFront API version/CloudFront/identity ID/config resource.

Lists the origin access identities for CloudFront.Send a GET request to the /CloudFront API version/origin-access-identity/cloudfront resource. The response includes a CloudFrontOriginAccessIdentityList element with zero or more CloudFrontOriginAccessIdentitySummary child elements. By default, your entire list of origin access identities is returned in one single page. If the list is long, you can paginate it using the MaxItems and Marker parameters.

Summary of the information about a CloudFront origin access identity.

A field-level encryption content type profile.

The configuration for a field-level encryption content type-profile mapping.

Field-level encryption content type-profile.

Contains a list of cookie names.

This field is deprecated. We recommend that you use a cache policy or an origin request policy instead of this field.

If you want to include cookies in the cache key, use CookiesConfig in a cache policy. See CachePolicy.

If you want to send cookies to the origin but not include them in the cache key, use CookiesConfig in an origin request policy. See OriginRequestPolicy.

A complex type that specifies whether you want CloudFront to forward cookies to the origin and, if so, which ones. For more information about forwarding cookies to the origin, see Caching Content Based on Cookies in the Amazon CloudFront Developer Guide.

The request to create a new origin access identity (OAI). An origin access identity is a special CloudFront user that you can associate with Amazon S3 origins, so that you can secure all or just some of your Amazon S3 content. For more information, see Restricting Access to Amazon S3 Content by Using an Origin Access Identity in the Amazon CloudFront Developer Guide.

The returned result of the corresponding request.

The request to create a new distribution.

The returned result of the corresponding request.

The request to create a new distribution with tags.

The returned result of the corresponding request.

The request to create an invalidation.

The returned result of the corresponding request.

The request to create a new streaming distribution.

The returned result of the corresponding request.

The request to create a new streaming distribution with tags.

The returned result of the corresponding request.

A complex type that controls:

  • Whether CloudFront replaces HTTP status codes in the 4xx and 5xx range with custom error messages before returning the response to the viewer.

  • How long CloudFront caches HTTP status codes in the 4xx and 5xx range.

For more information about custom error pages, see Customizing Error Responses in the Amazon CloudFront Developer Guide.

A complex type that controls:

  • Whether CloudFront replaces HTTP status codes in the 4xx and 5xx range with custom error messages before returning the response to the viewer.

  • How long CloudFront caches HTTP status codes in the 4xx and 5xx range.

For more information about custom error pages, see Customizing Error Responses in the Amazon CloudFront Developer Guide.

A complex type that contains the list of Custom Headers for each origin.

A custom origin. A custom origin is any origin that is not an Amazon S3 bucket, with one exception. An Amazon S3 bucket that is configured with static website hosting is a custom origin.

A complex type that describes the default cache behavior if you don’t specify a CacheBehavior element or if request URLs don’t match any of the values of PathPattern in CacheBehavior elements. You must create exactly one default cache behavior.

Deletes a origin access identity.

This action deletes a web distribution. To delete a web distribution using the CloudFront API, perform the following steps.

To delete a web distribution using the CloudFront API:

  1. Disable the web distribution

  2. Submit a GET Distribution Config request to get the current configuration and the Etag header for the distribution.

  3. Update the XML document that was returned in the response to your GET Distribution Config request to change the value of Enabled to false.

  4. Submit a PUT Distribution Config request to update the configuration for your distribution. In the request body, include the XML document that you updated in Step 3. Set the value of the HTTP If-Match header to the value of the ETag header that CloudFront returned when you submitted the GET Distribution Config request in Step 2.

  5. Review the response to the PUT Distribution Config request to confirm that the distribution was successfully disabled.

  6. Submit a GET Distribution request to confirm that your changes have propagated. When propagation is complete, the value of Status is Deployed.

  7. Submit a DELETE Distribution request. Set the value of the HTTP If-Match header to the value of the ETag header that CloudFront returned when you submitted the GET Distribution Config request in Step 6.

  8. Review the response to your DELETE Distribution request to confirm that the distribution was successfully deleted.

For information about deleting a distribution using the CloudFront console, see Deleting a Distribution in the Amazon CloudFront Developer Guide.

The request to delete a streaming distribution.

A distribution tells CloudFront where you want content to be delivered from, and the details about how to track and manage content delivery.

A distribution configuration.

A distribution Configuration and a list of tags to be associated with the distribution.

A list of distribution IDs.

A distribution list.

A summary of the information about a CloudFront distribution.

Complex data type for field-level encryption profiles that includes all of the encryption entities.

Complex data type for field-level encryption profiles that includes the encryption key and field pattern specifications.

Contains information about the Amazon Kinesis data stream where you are sending real-time log data in a real-time log configuration.

A complex data type that includes the profile configurations and other options specified for field-level encryption.

A complex data type that includes the profile configurations specified for field-level encryption.

List of field-level encrpytion configurations.

A complex data type for field-level encryption profiles.

A complex data type of profiles for the field-level encryption.

List of field-level encryption profiles.

The field-level encryption profile summary.

A summary of a field-level encryption item.

A complex data type that includes the field patterns to match for field-level encryption.

This field is deprecated. We recommend that you use a cache policy or an origin request policy instead of this field.

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

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

A CloudFront function that is associated with a cache behavior in a CloudFront distribution.

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

Contains configuration information about a CloudFront function.

A list of CloudFront functions.

Contains metadata about a CloudFront function.

Contains configuration information and metadata about a CloudFront function.

A complex type that controls the countries in which your content is distributed. CloudFront determines the location of your users using MaxMind GeoIP databases.

The origin access identity's configuration information. For more information, see CloudFrontOriginAccessIdentityConfig.

The returned result of the corresponding request.

The request to get an origin access identity's information.

The returned result of the corresponding request.

The request to get a distribution configuration.

The returned result of the corresponding request.

The request to get a distribution's information.

The returned result of the corresponding request.

The request to get an invalidation's information.

The returned result of the corresponding request.

To request to get a streaming distribution configuration.

The returned result of the corresponding request.

The request to get a streaming distribution's information.

The returned result of the corresponding request.

Contains a list of HTTP header names.

An invalidation.

An invalidation batch.

The InvalidationList complex type describes the list of invalidation objects. For more information about invalidation, see Invalidating Objects (Web Distributions Only) in the Amazon CloudFront Developer Guide.

A summary of an invalidation request.

A list of identifiers for the public keys that CloudFront can use to verify the signatures of signed URLs and signed cookies.

A key group.

A key group contains a list of public keys that you can use with CloudFront signed URLs and signed cookies.

A key group configuration.

A key group contains a list of public keys that you can use with CloudFront signed URLs and signed cookies.

A list of key groups.

Contains information about a key group.

A list of CloudFront key pair identifiers.

Contains information about the Amazon Kinesis data stream where you are sending real-time log data.

A complex type that contains a Lambda function association.

A complex type that specifies a list of Lambda functions associations for a cache behavior.

If you want to invoke one or more Lambda functions triggered by requests that match the PathPattern of the cache behavior, specify the applicable values for Quantity and Items. Note that there can be up to 4 LambdaFunctionAssociation items in this list (one for each possible value of EventType) and each EventType can be associated with the Lambda function only once.

If you don't want to invoke any Lambda functions for the requests that match PathPattern, specify 0 for Quantity and omit Items.

The request to list origin access identities.

The returned result of the corresponding request.

The request to list distributions that are associated with a specified AWS WAF web ACL.

The response to a request to list the distributions that are associated with a specified AWS WAF web ACL.

The request to list your distributions.

The returned result of the corresponding request.

The request to list invalidations.

The returned result of the corresponding request.

The request to list your streaming distributions.

The returned result of the corresponding request.

The request to list tags for a CloudFront resource.

The returned result of the corresponding request.

A complex type that controls whether access logs are written for the distribution.

A monitoring subscription. This structure contains information about whether additional CloudWatch metrics are enabled for a given CloudFront distribution.

An origin.

An origin is the location where content is stored, and from which CloudFront gets content to serve to viewers. To specify an origin:

  • Use S3OriginConfig to specify an Amazon S3 bucket that is not configured with static website hosting.

  • Use CustomOriginConfig to specify all other kinds of origins, including:

    • An Amazon S3 bucket that is configured with static website hosting

    • An Elastic Load Balancing load balancer

    • An AWS Elemental MediaPackage endpoint

    • An AWS Elemental MediaStore container

    • Any other HTTP server, running on an Amazon EC2 instance or any other kind of host

For the current maximum number of origins that you can specify per distribution, see General Quotas on Web Distributions in the Amazon CloudFront Developer Guide (quotas were formerly referred to as limits).

A complex type that contains HeaderName and HeaderValue elements, if any, for this distribution.

An origin group includes two origins (a primary origin and a second origin to failover to) and a failover criteria that you specify. You create an origin group to support origin failover in CloudFront. When you create or update a distribution, you can specifiy the origin group instead of a single origin, and CloudFront will failover from the primary origin to the second origin under the failover conditions that you've chosen.

A complex data type that includes information about the failover criteria for an origin group, including the status codes for which CloudFront will failover from the primary origin to the second origin.

An origin in an origin group.

A complex data type for the origins included in an origin group.

A complex data type for the origin groups specified for a distribution.

An origin request policy.

When it’s attached to a cache behavior, the origin request policy determines the values that CloudFront includes in requests that it sends to the origin. Each request that CloudFront sends to the origin includes the following:

  • The request body and the URL path (without the domain name) from the viewer request.

  • The headers that CloudFront automatically includes in every origin request, including Host, User-Agent, and X-Amz-Cf-Id.

  • All HTTP headers, cookies, and URL query strings that are specified in the cache policy or the origin request policy. These can include items from the viewer request and, in the case of headers, additional ones that are added by CloudFront.

CloudFront sends a request when it can’t find an object in its cache that matches the request. If you want to send values to the origin and also include them in the cache key, use CachePolicy.

An origin request policy configuration.

This configuration determines the values that CloudFront includes in requests that it sends to the origin. Each request that CloudFront sends to the origin includes the following:

  • The request body and the URL path (without the domain name) from the viewer request.

  • The headers that CloudFront automatically includes in every origin request, including Host, User-Agent, and X-Amz-Cf-Id.

  • All HTTP headers, cookies, and URL query strings that are specified in the cache policy or the origin request policy. These can include items from the viewer request and, in the case of headers, additional ones that are added by CloudFront.

CloudFront sends a request when it can’t find an object in its cache that matches the request. If you want to send values to the origin and also include them in the cache key, use CachePolicy.

An object that determines whether any cookies in viewer requests (and if so, which cookies) are included in requests that CloudFront sends to the origin.

An object that determines whether any HTTP headers (and if so, which headers) are included in requests that CloudFront sends to the origin.

A list of origin request policies.

An object that determines whether any URL query strings in viewer requests (and if so, which query strings) are included in requests that CloudFront sends to the origin.

Contains an origin request policy.

CloudFront Origin Shield.

Using Origin Shield can help reduce the load on your origin. For more information, see Using Origin Shield in the Amazon CloudFront Developer Guide.

A complex type that contains information about the SSL/TLS protocols that CloudFront can use when establishing an HTTPS connection with your origin.

Contains information about the origins for this distribution.

This object determines 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 headers, cookies, and query strings that are included in the cache key are automatically included in requests that CloudFront sends to the origin. CloudFront sends a request when it can’t find an 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.

A complex type that contains information about the objects that you want to invalidate. For more information, see Specifying the Objects to Invalidate in the Amazon CloudFront Developer Guide.

A public key that you can use with signed URLs and signed cookies, or with field-level encryption.

Configuration information about a public key that you can use with signed URLs and signed cookies, or with field-level encryption.

A list of public keys that you can use with signed URLs and signed cookies, or with field-level encryption.

Contains information about a public key.

Query argument-profile mapping for field-level encryption.

Configuration for query argument-profile mapping for field-level encryption.

Query argument-profile mapping for field-level encryption.

This field is deprecated. We recommend that you use a cache policy or an origin request policy instead of this field.

If you want to include query strings in the cache key, use QueryStringsConfig in a cache policy. See CachePolicy.

If you want to send query strings to the origin but not include them in the cache key, use QueryStringsConfig in an origin request policy. See OriginRequestPolicy.

A complex type that contains information about the query string parameters that you want CloudFront to use for caching for a cache behavior.

Contains a list of query string names.

A real-time log configuration.

A list of real-time log configurations.

A subscription configuration for additional CloudWatch metrics.

A complex type that identifies ways in which you want to restrict distribution of your content.

A complex type that contains information about the Amazon S3 bucket from which you want CloudFront to get your media files for distribution.

A complex type that contains information about the Amazon S3 origin. If the origin is a custom origin or an S3 bucket that is configured as a website endpoint, use the CustomOriginConfig element instead.

A list of AWS accounts and the active CloudFront key pairs in each account that CloudFront can use to verify the signatures of signed URLs and signed cookies.

A complex data type for the status codes that you specify that, when returned by a primary origin, trigger CloudFront to failover to a second origin.

A streaming distribution tells CloudFront where you want RTMP content to be delivered from, and the details about how to track and manage content delivery.

The RTMP distribution's configuration information.

A streaming distribution Configuration and a list of tags to be associated with the streaming distribution.

A streaming distribution list.

A summary of the information for a CloudFront streaming distribution.

A complex type that controls whether access logs are written for this streaming distribution.

A complex type that contains Tag key and Tag value.

A complex type that contains zero or more Tag elements.

The request to add tags to a CloudFront resource.

A complex type that contains zero or more Tag elements.

Contains the result of testing a CloudFront function with TestFunction.

A list of key groups whose public keys CloudFront can use to verify the signatures of signed URLs and signed cookies.

A list of AWS accounts whose public keys CloudFront can use to verify the signatures of signed URLs and signed cookies.

The request to remove tags from a CloudFront resource.

The request to update an origin access identity.

The returned result of the corresponding request.

The request to update a distribution.

The returned result of the corresponding request.

The request to update a streaming distribution.

The returned result of the corresponding request.

A complex type that determines the distribution’s SSL/TLS configuration for communicating with viewers.

If the distribution doesn’t use Aliases (also known as alternate domain names or CNAMEs)—that is, if the distribution uses the CloudFront domain name such as d111111abcdef8.cloudfront.net—set CloudFrontDefaultCertificate to true and leave all other fields empty.

If the distribution uses Aliases (alternate domain names or CNAMEs), use the fields in this type to specify the following settings:

  • Which viewers the distribution accepts HTTPS connections from: only viewers that support server name indication (SNI) (recommended), or all viewers including those that don’t support SNI.

    • To accept HTTPS connections from only viewers that support SNI, set SSLSupportMethod to sni-only. This is recommended. Most browsers and clients support SNI.

    • To accept HTTPS connections from all viewers, including those that don’t support SNI, set SSLSupportMethod to vip. This is not recommended, and results in additional monthly charges from CloudFront.

  • The minimum SSL/TLS protocol version that the distribution can use to communicate with viewers. To specify a minimum version, choose a value for MinimumProtocolVersion. For more information, see Security Policy in the Amazon CloudFront Developer Guide.

  • The location of the SSL/TLS certificate, AWS Certificate Manager (ACM) (recommended) or AWS Identity and Access Management (AWS IAM). You specify the location by setting a value in one of the following fields (not both):

    • ACMCertificateArn

    • IAMCertificateId

All distributions support HTTPS connections from viewers. To require viewers to use HTTPS only, or to redirect them from HTTP to HTTPS, use ViewerProtocolPolicy in the CacheBehavior or DefaultCacheBehavior. To specify how CloudFront should use SSL/TLS to communicate with your custom origin, use CustomOriginConfig.

For more information, see Using HTTPS with CloudFront and Using Alternate Domain Names and HTTPS in the Amazon CloudFront Developer Guide.

Enums

Errors returned by CreateCachePolicy

Errors returned by CreateCloudFrontOriginAccessIdentity

Errors returned by CreateDistribution

Errors returned by CreateDistributionWithTags

Errors returned by CreateFieldLevelEncryptionConfig

Errors returned by CreateFieldLevelEncryptionProfile

Errors returned by CreateFunction

Errors returned by CreateInvalidation

Errors returned by CreateKeyGroup

Errors returned by CreateMonitoringSubscription

Errors returned by CreateOriginRequestPolicy

Errors returned by CreatePublicKey

Errors returned by CreateRealtimeLogConfig

Errors returned by CreateStreamingDistribution

Errors returned by CreateStreamingDistributionWithTags

Errors returned by DeleteCachePolicy

Errors returned by DeleteCloudFrontOriginAccessIdentity

Errors returned by DeleteDistribution

Errors returned by DeleteFieldLevelEncryptionConfig

Errors returned by DeleteFieldLevelEncryptionProfile

Errors returned by DeleteFunction

Errors returned by DeleteKeyGroup

Errors returned by DeleteMonitoringSubscription

Errors returned by DeleteOriginRequestPolicy

Errors returned by DeletePublicKey

Errors returned by DeleteRealtimeLogConfig

Errors returned by DeleteStreamingDistribution

Errors returned by DescribeFunction

Errors returned by GetCachePolicyConfig

Errors returned by GetCachePolicy

Errors returned by GetCloudFrontOriginAccessIdentityConfig

Errors returned by GetCloudFrontOriginAccessIdentity

Errors returned by GetDistributionConfig

Errors returned by GetDistribution

Errors returned by GetFieldLevelEncryptionConfig

Errors returned by GetFieldLevelEncryption

Errors returned by GetFieldLevelEncryptionProfileConfig

Errors returned by GetFieldLevelEncryptionProfile

Errors returned by GetFunction

Errors returned by GetInvalidation

Errors returned by GetKeyGroupConfig

Errors returned by GetKeyGroup

Errors returned by GetMonitoringSubscription

Errors returned by GetOriginRequestPolicyConfig

Errors returned by GetOriginRequestPolicy

Errors returned by GetPublicKeyConfig

Errors returned by GetPublicKey

Errors returned by GetRealtimeLogConfig

Errors returned by GetStreamingDistributionConfig

Errors returned by GetStreamingDistribution

Errors returned by ListCachePolicies

Errors returned by ListCloudFrontOriginAccessIdentities

Errors returned by ListDistributionsByCachePolicyId

Errors returned by ListDistributionsByKeyGroup

Errors returned by ListDistributionsByOriginRequestPolicyId

Errors returned by ListDistributionsByRealtimeLogConfig

Errors returned by ListDistributionsByWebACLId

Errors returned by ListDistributions

Errors returned by ListFieldLevelEncryptionConfigs

Errors returned by ListFieldLevelEncryptionProfiles

Errors returned by ListFunctions

Errors returned by ListInvalidations

Errors returned by ListKeyGroups

Errors returned by ListOriginRequestPolicies

Errors returned by ListPublicKeys

Errors returned by ListRealtimeLogConfigs

Errors returned by ListStreamingDistributions

Errors returned by ListTagsForResource

Errors returned by PublishFunction

Errors returned by TagResource

Errors returned by TestFunction

Errors returned by UntagResource

Errors returned by UpdateCachePolicy

Errors returned by UpdateCloudFrontOriginAccessIdentity

Errors returned by UpdateDistribution

Errors returned by UpdateFieldLevelEncryptionConfig

Errors returned by UpdateFieldLevelEncryptionProfile

Errors returned by UpdateFunction

Errors returned by UpdateKeyGroup

Errors returned by UpdateOriginRequestPolicy

Errors returned by UpdatePublicKey

Errors returned by UpdateRealtimeLogConfig

Errors returned by UpdateStreamingDistribution

Traits

Trait representing the capabilities of the CloudFront API. CloudFront clients implement this trait.