Represents a specific version of an object. Object creation date or the last modified date, whichever is the For more information about server-side encryption, see Protecting data using encryption.Ī general header field used to specify caching policies. If server-side encryption is requested for the object, then the checksum is stored The checksum, along with the specified algorithm, are stored as part of the object's For more information about storage classes, seeĪmazon S3 uses AWS KMS keys to encrypt your Amazon S3 objects. When you create objects, you can configure values of these system metadata items Amazon S3 stores the page redirect value as In thisĬase, a webpage is an object in your bucket. Might want to redirect a page request to another page or an external URL. If your bucket is configured as a website, sometimes you Whether the object has server-side encryption enabled, are examples of system metadata Other system metadata, such as the storage class configured for the object and Metadata such as object creation date is system controlled, where only Amazon S3 can There are two categories of system metadata: For example, Amazon S3 maintains object creation dateĪnd size metadata and uses this information as part of object management. Processes this system metadata as needed. System-defined object metadataįor each object stored in a bucket, Amazon S3 maintains a set of system metadata.

For more information about editing metadata using theĪmazon S3 console, see Editing object metadata in the Amazon S3 console. System-defined and user-defined metadata. The sections below provide more information about There are two kinds of metadata in Amazon S3: system-defined metadata and For more information, see Creating object key names.

The object key (or key name) uniquely identifies the object in an Amazon

When you create an object, you also specify the key name, which uniquely identifies the Only way to modify object metadata is to make a copy of the object and set the metadata. After you upload the object, you cannot modify object metadata. You can set object metadata in Amazon S3 at the time you upload the object.

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