See: newHeadObject smart constructor.

Create a value of HeadObject with all optional fields omitted.

Use generic-lens or optics to modify other optional fields.

The following record fields are available, with the corresponding lenses provided for backwards compatibility:

$sel:checksumMode:HeadObject', headObject_checksumMode - To retrieve the checksum, this parameter must be enabled.

In addition, if you enable ChecksumMode and the object is encrypted with Amazon Web Services Key Management Service (Amazon Web Services KMS), you must have permission to use the kms:Decrypt action for the request to succeed.

$sel:expectedBucketOwner:HeadObject', headObject_expectedBucketOwner - The account ID of the expected bucket owner. If the bucket is owned by a different account, the request fails with the HTTP status code 403 Forbidden (access denied).

$sel:ifMatch:HeadObject', headObject_ifMatch - Return the object only if its entity tag (ETag) is the same as the one specified; otherwise, return a 412 (precondition failed) error.

$sel:ifModifiedSince:HeadObject', headObject_ifModifiedSince - Return the object only if it has been modified since the specified time; otherwise, return a 304 (not modified) error.

$sel:ifNoneMatch:HeadObject', headObject_ifNoneMatch - Return the object only if its entity tag (ETag) is different from the one specified; otherwise, return a 304 (not modified) error.

$sel:ifUnmodifiedSince:HeadObject', headObject_ifUnmodifiedSince - Return the object only if it has not been modified since the specified time; otherwise, return a 412 (precondition failed) error.

HeadObject, headObject_partNumber - Part number of the object being read. This is a positive integer between 1 and 10,000. Effectively performs a 'ranged' HEAD request for the part specified. Useful querying about the size of the part and the number of parts in this object.

$sel:range:HeadObject', headObject_range - Because HeadObject returns only the metadata for an object, this parameter has no effect.

$sel:requestPayer:HeadObject', headObject_requestPayer - Undocumented member.

HeadObject, headObject_sSECustomerAlgorithm - Specifies the algorithm to use to when encrypting the object (for example, AES256).

$sel:sSECustomerKey:HeadObject', headObject_sSECustomerKey - Specifies the customer-provided encryption key for Amazon S3 to use in encrypting data. This value is used to store the object and then it is discarded; Amazon S3 does not store the encryption key. The key must be appropriate for use with the algorithm specified in the x-amz-server-side-encryption-customer-algorithm header.

HeadObject, headObject_sSECustomerKeyMD5 - Specifies the 128-bit MD5 digest of the encryption key according to RFC 1321. Amazon S3 uses this header for a message integrity check to ensure that the encryption key was transmitted without error.

HeadObject, headObject_versionId - VersionId used to reference a specific version of the object.

HeadObject, headObject_bucket - The name of the bucket containing the object.

When using this action with an access point, you must direct requests to the access point hostname. The access point hostname takes the form AccessPointName-AccountId.s3-accesspoint.Region.amazonaws.com. When using this action with an access point through the Amazon Web Services SDKs, you provide the access point ARN in place of the bucket name. For more information about access point ARNs, see Using access points in the Amazon S3 User Guide.

When using this action with Amazon S3 on Outposts, you must direct requests to the S3 on Outposts hostname. The S3 on Outposts hostname takes the form AccessPointName-AccountId.outpostID.s3-outposts.Region.amazonaws.com. When using this action with S3 on Outposts through the Amazon Web Services SDKs, you provide the Outposts bucket ARN in place of the bucket name. For more information about S3 on Outposts ARNs, see Using Amazon S3 on Outposts in the Amazon S3 User Guide.

HeadObject, headObject_key - The object key.

To retrieve the checksum, this parameter must be enabled.

In addition, if you enable ChecksumMode and the object is encrypted with Amazon Web Services Key Management Service (Amazon Web Services KMS), you must have permission to use the kms:Decrypt action for the request to succeed.

The account ID of the expected bucket owner. If the bucket is owned by a different account, the request fails with the HTTP status code 403 Forbidden (access denied).

Return the object only if its entity tag (ETag) is the same as the one specified; otherwise, return a 412 (precondition failed) error.

Return the object only if it has been modified since the specified time; otherwise, return a 304 (not modified) error.

Return the object only if its entity tag (ETag) is different from the one specified; otherwise, return a 304 (not modified) error.

Return the object only if it has not been modified since the specified time; otherwise, return a 412 (precondition failed) error.

Part number of the object being read. This is a positive integer between 1 and 10,000. Effectively performs a 'ranged' HEAD request for the part specified. Useful querying about the size of the part and the number of parts in this object.

Because HeadObject returns only the metadata for an object, this parameter has no effect.

Undocumented member.

Specifies the algorithm to use to when encrypting the object (for example, AES256).

Specifies the customer-provided encryption key for Amazon S3 to use in encrypting data. This value is used to store the object and then it is discarded; Amazon S3 does not store the encryption key. The key must be appropriate for use with the algorithm specified in the x-amz-server-side-encryption-customer-algorithm header.

Specifies the 128-bit MD5 digest of the encryption key according to RFC 1321. Amazon S3 uses this header for a message integrity check to ensure that the encryption key was transmitted without error.

VersionId used to reference a specific version of the object.

The name of the bucket containing the object.

When using this action with an access point, you must direct requests to the access point hostname. The access point hostname takes the form AccessPointName-AccountId.s3-accesspoint.Region.amazonaws.com. When using this action with an access point through the Amazon Web Services SDKs, you provide the access point ARN in place of the bucket name. For more information about access point ARNs, see Using access points in the Amazon S3 User Guide.

When using this action with Amazon S3 on Outposts, you must direct requests to the S3 on Outposts hostname. The S3 on Outposts hostname takes the form AccessPointName-AccountId.outpostID.s3-outposts.Region.amazonaws.com. When using this action with S3 on Outposts through the Amazon Web Services SDKs, you provide the Outposts bucket ARN in place of the bucket name. For more information about S3 on Outposts ARNs, see Using Amazon S3 on Outposts in the Amazon S3 User Guide.

The object key.

See: newHeadObjectResponse smart constructor.

Create a value of HeadObjectResponse with all optional fields omitted.

Use generic-lens or optics to modify other optional fields.

The following record fields are available, with the corresponding lenses provided for backwards compatibility:

$sel:acceptRanges:HeadObjectResponse', headObjectResponse_acceptRanges - Indicates that a range of bytes was specified.

$sel:archiveStatus:HeadObjectResponse', headObjectResponse_archiveStatus - The archive state of the head object.

HeadObjectResponse, headObjectResponse_bucketKeyEnabled - Indicates whether the object uses an S3 Bucket Key for server-side encryption with Amazon Web Services KMS (SSE-KMS).

$sel:cacheControl:HeadObjectResponse', headObjectResponse_cacheControl - Specifies caching behavior along the request/reply chain.

HeadObjectResponse, headObjectResponse_checksumCRC32 - The base64-encoded, 32-bit CRC32 checksum of the object. This will only be present if it was uploaded with the object. With multipart uploads, this may not be a checksum value of the object. For more information about how checksums are calculated with multipart uploads, see Checking object integrity in the Amazon S3 User Guide.

HeadObjectResponse, headObjectResponse_checksumCRC32C - The base64-encoded, 32-bit CRC32C checksum of the object. This will only be present if it was uploaded with the object. With multipart uploads, this may not be a checksum value of the object. For more information about how checksums are calculated with multipart uploads, see Checking object integrity in the Amazon S3 User Guide.

HeadObjectResponse, headObjectResponse_checksumSHA1 - The base64-encoded, 160-bit SHA-1 digest of the object. This will only be present if it was uploaded with the object. With multipart uploads, this may not be a checksum value of the object. For more information about how checksums are calculated with multipart uploads, see Checking object integrity in the Amazon S3 User Guide.

HeadObjectResponse, headObjectResponse_checksumSHA256 - The base64-encoded, 256-bit SHA-256 digest of the object. This will only be present if it was uploaded with the object. With multipart uploads, this may not be a checksum value of the object. For more information about how checksums are calculated with multipart uploads, see Checking object integrity in the Amazon S3 User Guide.

$sel:contentDisposition:HeadObjectResponse', headObjectResponse_contentDisposition - Specifies presentational information for the object.

$sel:contentEncoding:HeadObjectResponse', headObjectResponse_contentEncoding - Specifies what content encodings have been applied to the object and thus what decoding mechanisms must be applied to obtain the media-type referenced by the Content-Type header field.

$sel:contentLanguage:HeadObjectResponse', headObjectResponse_contentLanguage - The language the content is in.

$sel:contentLength:HeadObjectResponse', headObjectResponse_contentLength - Size of the body in bytes.

$sel:contentType:HeadObjectResponse', headObjectResponse_contentType - A standard MIME type describing the format of the object data.

HeadObjectResponse, headObjectResponse_deleteMarker - Specifies whether the object retrieved was (true) or was not (false) a Delete Marker. If false, this response header does not appear in the response.

HeadObjectResponse, headObjectResponse_eTag - An entity tag (ETag) is an opaque identifier assigned by a web server to a specific version of a resource found at a URL.

HeadObjectResponse, headObjectResponse_expiration - If the object expiration is configured (see PUT Bucket lifecycle), the response includes this header. It includes the expiry-date and rule-id key-value pairs providing object expiration information. The value of the rule-id is URL-encoded.

$sel:expires:HeadObjectResponse', headObjectResponse_expires - The date and time at which the object is no longer cacheable.

HeadObjectResponse, headObjectResponse_lastModified - Creation date of the object.

$sel:metadata:HeadObjectResponse', headObjectResponse_metadata - A map of metadata to store with the object in S3.

$sel:missingMeta:HeadObjectResponse', headObjectResponse_missingMeta - This is set to the number of metadata entries not returned in x-amz-meta headers. This can happen if you create metadata using an API like SOAP that supports more flexible metadata than the REST API. For example, using SOAP, you can create metadata whose values are not legal HTTP headers.

$sel:objectLockLegalHoldStatus:HeadObjectResponse', headObjectResponse_objectLockLegalHoldStatus - Specifies whether a legal hold is in effect for this object. This header is only returned if the requester has the s3:GetObjectLegalHold permission. This header is not returned if the specified version of this object has never had a legal hold applied. For more information about S3 Object Lock, see Object Lock.

$sel:objectLockMode:HeadObjectResponse', headObjectResponse_objectLockMode - The Object Lock mode, if any, that's in effect for this object. This header is only returned if the requester has the s3:GetObjectRetention permission. For more information about S3 Object Lock, see Object Lock.

$sel:objectLockRetainUntilDate:HeadObjectResponse', headObjectResponse_objectLockRetainUntilDate - The date and time when the Object Lock retention period expires. This header is only returned if the requester has the s3:GetObjectRetention permission.

$sel:partsCount:HeadObjectResponse', headObjectResponse_partsCount - The count of parts this object has. This value is only returned if you specify partNumber in your request and the object was uploaded as a multipart upload.

$sel:replicationStatus:HeadObjectResponse', headObjectResponse_replicationStatus - Amazon S3 can return this header if your request involves a bucket that is either a source or a destination in a replication rule.

In replication, you have a source bucket on which you configure replication and destination bucket or buckets where Amazon S3 stores object replicas. When you request an object (GetObject) or object metadata (HeadObject) from these buckets, Amazon S3 will return the x-amz-replication-status header in the response as follows:

• If requesting an object from the source bucket, Amazon S3 will return the x-amz-replication-status header if the object in your request is eligible for replication.

  For example, suppose that in your replication configuration, you specify object prefix TaxDocs requesting Amazon S3 to replicate objects with key prefix TaxDocs. Any objects you upload with this key name prefix, for example TaxDocs/document1.pdf, are eligible for replication. For any object request with this key name prefix, Amazon S3 will return the x-amz-replication-status header with value PENDING, COMPLETED or FAILED indicating object replication status.

• If requesting an object from a destination bucket, Amazon S3 will return the x-amz-replication-status header with value REPLICA if the object in your request is a replica that Amazon S3 created and there is no replica modification replication in progress.
• When replicating objects to multiple destination buckets, the x-amz-replication-status header acts differently. The header of the source object will only return a value of COMPLETED when replication is successful to all destinations. The header will remain at value PENDING until replication has completed for all destinations. If one or more destinations fails replication the header will return FAILED.

For more information, see Replication.

$sel:requestCharged:HeadObjectResponse', headObjectResponse_requestCharged - Undocumented member.

$sel:restore:HeadObjectResponse', headObjectResponse_restore - If the object is an archived object (an object whose storage class is GLACIER), the response includes this header if either the archive restoration is in progress (see RestoreObject or an archive copy is already restored.

If an archive copy is already restored, the header value indicates when Amazon S3 is scheduled to delete the object copy. For example:

x-amz-restore: ongoing-request="false", expiry-date="Fri, 21 Dec 2012 00:00:00 GMT"

If the object restoration is in progress, the header returns the value ongoing-request="true".

For more information about archiving objects, see Transitioning Objects: General Considerations.

HeadObject, headObjectResponse_sSECustomerAlgorithm - If server-side encryption with a customer-provided encryption key was requested, the response will include this header confirming the encryption algorithm used.

HeadObject, headObjectResponse_sSECustomerKeyMD5 - If server-side encryption with a customer-provided encryption key was requested, the response will include this header to provide round-trip message integrity verification of the customer-provided encryption key.

$sel:sSEKMSKeyId:HeadObjectResponse', headObjectResponse_sSEKMSKeyId - If present, specifies the ID of the Amazon Web Services Key Management Service (Amazon Web Services KMS) symmetric customer managed key that was used for the object.

$sel:serverSideEncryption:HeadObjectResponse', headObjectResponse_serverSideEncryption - If the object is stored using server-side encryption either with an Amazon Web Services KMS key or an Amazon S3-managed encryption key, the response includes this header with the value of the server-side encryption algorithm used when storing this object in Amazon S3 (for example, AES256, aws:kms).

HeadObjectResponse, headObjectResponse_storageClass - Provides storage class information of the object. Amazon S3 returns this header for all objects except for S3 Standard storage class objects.

For more information, see Storage Classes.

HeadObject, headObjectResponse_versionId - Version of the object.

$sel:websiteRedirectLocation:HeadObjectResponse', headObjectResponse_websiteRedirectLocation - If the bucket is configured as a website, redirects requests for this object to another object in the same bucket or to an external URL. Amazon S3 stores the value of this header in the object metadata.

$sel:httpStatus:HeadObjectResponse', headObjectResponse_httpStatus - The response's http status code.

Indicates that a range of bytes was specified.

The archive state of the head object.

Indicates whether the object uses an S3 Bucket Key for server-side encryption with Amazon Web Services KMS (SSE-KMS).

Specifies caching behavior along the request/reply chain.

The base64-encoded, 32-bit CRC32 checksum of the object. This will only be present if it was uploaded with the object. With multipart uploads, this may not be a checksum value of the object. For more information about how checksums are calculated with multipart uploads, see Checking object integrity in the Amazon S3 User Guide.

The base64-encoded, 32-bit CRC32C checksum of the object. This will only be present if it was uploaded with the object. With multipart uploads, this may not be a checksum value of the object. For more information about how checksums are calculated with multipart uploads, see Checking object integrity in the Amazon S3 User Guide.

The base64-encoded, 160-bit SHA-1 digest of the object. This will only be present if it was uploaded with the object. With multipart uploads, this may not be a checksum value of the object. For more information about how checksums are calculated with multipart uploads, see Checking object integrity in the Amazon S3 User Guide.

The base64-encoded, 256-bit SHA-256 digest of the object. This will only be present if it was uploaded with the object. With multipart uploads, this may not be a checksum value of the object. For more information about how checksums are calculated with multipart uploads, see Checking object integrity in the Amazon S3 User Guide.

Specifies presentational information for the object.

Specifies what content encodings have been applied to the object and thus what decoding mechanisms must be applied to obtain the media-type referenced by the Content-Type header field.

The language the content is in.

Size of the body in bytes.

A standard MIME type describing the format of the object data.

Specifies whether the object retrieved was (true) or was not (false) a Delete Marker. If false, this response header does not appear in the response.

An entity tag (ETag) is an opaque identifier assigned by a web server to a specific version of a resource found at a URL.

If the object expiration is configured (see PUT Bucket lifecycle), the response includes this header. It includes the expiry-date and rule-id key-value pairs providing object expiration information. The value of the rule-id is URL-encoded.

The date and time at which the object is no longer cacheable.

Creation date of the object.

A map of metadata to store with the object in S3.

This is set to the number of metadata entries not returned in x-amz-meta headers. This can happen if you create metadata using an API like SOAP that supports more flexible metadata than the REST API. For example, using SOAP, you can create metadata whose values are not legal HTTP headers.

Specifies whether a legal hold is in effect for this object. This header is only returned if the requester has the s3:GetObjectLegalHold permission. This header is not returned if the specified version of this object has never had a legal hold applied. For more information about S3 Object Lock, see Object Lock.

The Object Lock mode, if any, that's in effect for this object. This header is only returned if the requester has the s3:GetObjectRetention permission. For more information about S3 Object Lock, see Object Lock.

The date and time when the Object Lock retention period expires. This header is only returned if the requester has the s3:GetObjectRetention permission.

The count of parts this object has. This value is only returned if you specify partNumber in your request and the object was uploaded as a multipart upload.

Amazon S3 can return this header if your request involves a bucket that is either a source or a destination in a replication rule.

In replication, you have a source bucket on which you configure replication and destination bucket or buckets where Amazon S3 stores object replicas. When you request an object (GetObject) or object metadata (HeadObject) from these buckets, Amazon S3 will return the x-amz-replication-status header in the response as follows:

• If requesting an object from the source bucket, Amazon S3 will return the x-amz-replication-status header if the object in your request is eligible for replication.

  For example, suppose that in your replication configuration, you specify object prefix TaxDocs requesting Amazon S3 to replicate objects with key prefix TaxDocs. Any objects you upload with this key name prefix, for example TaxDocs/document1.pdf, are eligible for replication. For any object request with this key name prefix, Amazon S3 will return the x-amz-replication-status header with value PENDING, COMPLETED or FAILED indicating object replication status.

• If requesting an object from a destination bucket, Amazon S3 will return the x-amz-replication-status header with value REPLICA if the object in your request is a replica that Amazon S3 created and there is no replica modification replication in progress.
• When replicating objects to multiple destination buckets, the x-amz-replication-status header acts differently. The header of the source object will only return a value of COMPLETED when replication is successful to all destinations. The header will remain at value PENDING until replication has completed for all destinations. If one or more destinations fails replication the header will return FAILED.

For more information, see Replication.

Undocumented member.

If the object is an archived object (an object whose storage class is GLACIER), the response includes this header if either the archive restoration is in progress (see RestoreObject or an archive copy is already restored.

If an archive copy is already restored, the header value indicates when Amazon S3 is scheduled to delete the object copy. For example:

x-amz-restore: ongoing-request="false", expiry-date="Fri, 21 Dec 2012 00:00:00 GMT"

If the object restoration is in progress, the header returns the value ongoing-request="true".

For more information about archiving objects, see Transitioning Objects: General Considerations.

If server-side encryption with a customer-provided encryption key was requested, the response will include this header confirming the encryption algorithm used.

If server-side encryption with a customer-provided encryption key was requested, the response will include this header to provide round-trip message integrity verification of the customer-provided encryption key.

If present, specifies the ID of the Amazon Web Services Key Management Service (Amazon Web Services KMS) symmetric customer managed key that was used for the object.

If the object is stored using server-side encryption either with an Amazon Web Services KMS key or an Amazon S3-managed encryption key, the response includes this header with the value of the server-side encryption algorithm used when storing this object in Amazon S3 (for example, AES256, aws:kms).

Provides storage class information of the object. Amazon S3 returns this header for all objects except for S3 Standard storage class objects.

For more information, see Storage Classes.

Version of the object.

If the bucket is configured as a website, redirects requests for this object to another object in the same bucket or to an external URL. Amazon S3 stores the value of this header in the object metadata.

The response's http status code.