Common Response Headers

The following table describes response headers that are common to most AWS S3 responses.

Name	Description
Content-Length	The length in bytes of the body in the response. Type: String Default: None
Content-Type	The MIME type of the content. For example, Content-Type: text/html; charset=utf-8 Type: String Default: None
Connection	specifies whether the connection to the server is open or closed. Type: Enum Valid Values: open | close Default: None
Date	The date and time Amazon S3 responded, for example, Wed, 01 Mar 2006 12:00:00 GMT. Type: String Default: None
ETag	The entity tag is a hash of the object. The ETag reflects changes only to the contents of an object, not its metadata. The ETag may or may not be an MD5 digest of the object data. Whether or not it is depends on how the object was created and how it is encrypted as described below: Objects created by the PUT Object, POST Object, or Copy operation, or through the AWS Management Console, and are encrypted by SSE-S3 or plaintext, have ETags that are an MD5 digest of their object data. Objects created by the PUT Object, POST Object, or Copy operation, or through the AWS Management Console, and are encrypted by SSE-C or SSE-KMS, have ETags that are not an MD5 digest of their object data. If an object is created by either the Multipart Upload or Part Copy operation, the ETag is not an MD5 digest, regardless of the method of encryption. Type: String
Server	The name of the server that created the response. Type: String Default: AmazonS3
x-amz-delete-marker	Specifies whether the object returned was (true) or was not (false) a delete marker. Type: Boolean Valid Values: true | false Default: false
x-amz-id-2	A special token that is used together with the x-amz-request-id header to help AWS troubleshoot problems. For information about AWS support using these request IDs, see Troubleshooting Amazon S3. Type: String Default: None
x-amz-request-id	A value created by Amazon S3 that uniquely identifies the request. This value is used together with the x-amz-id-2 header to help AWS troubleshoot problems. For information about AWS support using these request IDs, see Troubleshooting Amazon S3. Type: String Default: None
x-amz-version-id	The version of the object. When you enable versioning, Amazon S3 generates a random number for objects added to a bucket. The value is UTF-8 encoded and URL ready. When you PUT an object in a bucket where versioning has been suspended, the version ID is always null. Type: String Valid Values: null | any URL-ready, UTF-8 encoded string Default: null