2023/09/26 - Amazon Simple Storage Service - 3 updated api methods
Changes This release adds a new field COMPLETED to the ReplicationStatus Enum. You can now use this field to validate the replication status of S3 objects using the AWS SDK.
{'ReplicationStatus': {'COMPLETED'}}
Retrieves objects from Amazon S3. To use GET , you must have READ access to the object. If you grant READ access to the anonymous user, you can return the object without using an authorization header.
An Amazon S3 bucket has no directory hierarchy such as you would find in a typical computer file system. You can, however, create a logical hierarchy by using object key names that imply a folder structure. For example, instead of naming an object sample.jpg , you can name it photos/2006/February/sample.jpg .
To get an object from such a logical hierarchy, specify the full key name for the object in the GET operation. For a virtual hosted-style request example, if you have the object photos/2006/February/sample.jpg , specify the resource as /photos/2006/February/sample.jpg . For a path-style request example, if you have the object photos/2006/February/sample.jpg in the bucket named examplebucket , specify the resource as /examplebucket/photos/2006/February/sample.jpg . For more information about request types, see HTTP Host Header Bucket Specification.
For more information about returning the ACL of an object, see GetObjectAcl.
If the object you are retrieving is stored in the S3 Glacier Flexible Retrieval or S3 Glacier Deep Archive storage class, or S3 Intelligent-Tiering Archive or S3 Intelligent-Tiering Deep Archive tiers, before you can retrieve the object you must first restore a copy using RestoreObject. Otherwise, this action returns an InvalidObjectState error. For information about restoring archived objects, see Restoring Archived Objects.
Encryption request headers, like x-amz-server-side-encryption , should not be sent for GET requests if your object uses server-side encryption with Key Management Service (KMS) keys (SSE-KMS), dual-layer server-side encryption with Amazon Web Services KMS keys (DSSE-KMS), or server-side encryption with Amazon S3 managed encryption keys (SSE-S3). If your object does use these types of keys, you’ll get an HTTP 400 Bad Request error.
If you encrypt an object by using server-side encryption with customer-provided encryption keys (SSE-C) when you store the object in Amazon S3, then when you GET the object, you must use the following headers:
x-amz-server-side-encryption-customer-algorithm
x-amz-server-side-encryption-customer-key
x-amz-server-side-encryption-customer-key-MD5
For more information about SSE-C, see Server-Side Encryption (Using Customer-Provided Encryption Keys).
Assuming you have the relevant permission to read object tags, the response also returns the x-amz-tagging-count header that provides the count of number of tags associated with the object. You can use GetObjectTagging to retrieve the tag set associated with an object.
Permissions
You need the relevant read object (or version) permission for this operation. For more information, see Specifying Permissions in a Policy. If the object that you request doesn’t exist, the error that Amazon S3 returns depends on whether you also have the s3:ListBucket permission.
If you have the s3:ListBucket permission on the bucket, Amazon S3 returns an HTTP status code 404 (Not Found) error.
If you don’t have the s3:ListBucket permission, Amazon S3 returns an HTTP status code 403 ("access denied") error.
Versioning
By default, the GET action returns the current version of an object. To return a different version, use the versionId subresource.
Note
If you supply a versionId , you need the s3:GetObjectVersion permission to access a specific version of an object. If you request a specific version, you do not need to have the s3:GetObject permission. If you request the current version without a specific version ID, only s3:GetObject permission is required. s3:GetObjectVersion permission won't be required.
If the current version of the object is a delete marker, Amazon S3 behaves as if the object was deleted and includes x-amz-delete-marker: true in the response.
For more information about versioning, see PutBucketVersioning.
Overriding Response Header Values
There are times when you want to override certain response header values in a GET response. For example, you might override the Content-Disposition response header value in your GET request.
You can override values for a set of response headers using the following query parameters. These response header values are sent only on a successful request, that is, when status code 200 OK is returned. The set of headers you can override using these parameters is a subset of the headers that Amazon S3 accepts when you create an object. The response headers that you can override for the GET response are Content-Type , Content-Language , Expires , Cache-Control , Content-Disposition , and Content-Encoding . To override these header values in the GET response, you use the following request parameters.
Note
You must sign the request, either using an Authorization header or a presigned URL, when using these parameters. They cannot be used with an unsigned (anonymous) request.
response-content-type
response-content-language
response-expires
response-cache-control
response-content-disposition
response-content-encoding
Overriding Response Header Values
If both of the If-Match and If-Unmodified-Since headers are present in the request as follows: If-Match condition evaluates to true , and; If-Unmodified-Since condition evaluates to false ; then, S3 returns 200 OK and the data requested.
If both of the If-None-Match and If-Modified-Since headers are present in the request as follows: If-None-Match condition evaluates to false , and; If-Modified-Since condition evaluates to true ; then, S3 returns 304 Not Modified response code.
For more information about conditional requests, see RFC 7232.
The following operations are related to GetObject :
See also: AWS API Documentation
Request Syntax
client.get_object(
Bucket='string',
IfMatch='string',
IfModifiedSince=datetime(2015, 1, 1),
IfNoneMatch='string',
IfUnmodifiedSince=datetime(2015, 1, 1),
Key='string',
Range='string',
ResponseCacheControl='string',
ResponseContentDisposition='string',
ResponseContentEncoding='string',
ResponseContentLanguage='string',
ResponseContentType='string',
ResponseExpires=datetime(2015, 1, 1),
VersionId='string',
SSECustomerAlgorithm='string',
SSECustomerKey=b'bytes',
SSECustomerKeyMD5='string',
RequestPayer='requester',
PartNumber=123,
ExpectedBucketOwner='string',
ChecksumMode='ENABLED'
)
string
[REQUIRED]
The bucket name 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 an Object Lambda access point the hostname takes the form AccessPointName -AccountId .s3-object-lambda.*Region* .amazonaws.com.
When you use 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 you use this action with S3 on Outposts through the Amazon Web Services SDKs, you provide the Outposts access point ARN in place of the bucket name. For more information about S3 on Outposts ARNs, see What is S3 on Outposts? in the Amazon S3 User Guide .
string
Return the object only if its entity tag (ETag) is the same as the one specified; otherwise, return a 412 (precondition failed) error.
datetime
Return the object only if it has been modified since the specified time; otherwise, return a 304 (not modified) error.
string
Return the object only if its entity tag (ETag) is different from the one specified; otherwise, return a 304 (not modified) error.
datetime
Return the object only if it has not been modified since the specified time; otherwise, return a 412 (precondition failed) error.
string
[REQUIRED]
Key of the object to get.
string
Downloads the specified range bytes of an object. For more information about the HTTP Range header, see https://www.rfc-editor.org/rfc/rfc9110.html#name-range.
Note
Amazon S3 doesn't support retrieving multiple ranges of data per GET request.
string
Sets the Cache-Control header of the response.
string
Sets the Content-Disposition header of the response
string
Sets the Content-Encoding header of the response.
string
Sets the Content-Language header of the response.
string
Sets the Content-Type header of the response.
datetime
Sets the Expires header of the response.
string
VersionId used to reference a specific version of the object.
string
Specifies the algorithm to use to when decrypting the object (for example, AES256).
bytes
Specifies the customer-provided encryption key for Amazon S3 used to encrypt the data. This value is used to decrypt the object when recovering it and must match the one used when storing the data. The key must be appropriate for use with the algorithm specified in the x-amz-server-side-encryption-customer-algorithm header.
string
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.
string
Confirms that the requester knows that they will be charged for the request. Bucket owners need not specify this parameter in their requests. If either the source or destination Amazon S3 bucket has Requester Pays enabled, the requester will pay for corresponding charges to copy the object. For information about downloading objects from Requester Pays buckets, see Downloading Objects in Requester Pays Buckets in the Amazon S3 User Guide .
integer
Part number of the object being read. This is a positive integer between 1 and 10,000. Effectively performs a 'ranged' GET request for the part specified. Useful for downloading just a part of an object.
string
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).
string
To retrieve the checksum, this mode must be enabled.
dict
Response Syntax
{
'Body': StreamingBody(),
'DeleteMarker': True|False,
'AcceptRanges': 'string',
'Expiration': 'string',
'Restore': 'string',
'LastModified': datetime(2015, 1, 1),
'ContentLength': 123,
'ETag': 'string',
'ChecksumCRC32': 'string',
'ChecksumCRC32C': 'string',
'ChecksumSHA1': 'string',
'ChecksumSHA256': 'string',
'MissingMeta': 123,
'VersionId': 'string',
'CacheControl': 'string',
'ContentDisposition': 'string',
'ContentEncoding': 'string',
'ContentLanguage': 'string',
'ContentRange': 'string',
'ContentType': 'string',
'Expires': datetime(2015, 1, 1),
'WebsiteRedirectLocation': 'string',
'ServerSideEncryption': 'AES256'|'aws:kms'|'aws:kms:dsse',
'Metadata': {
'string': 'string'
},
'SSECustomerAlgorithm': 'string',
'SSECustomerKeyMD5': 'string',
'SSEKMSKeyId': 'string',
'BucketKeyEnabled': True|False,
'StorageClass': 'STANDARD'|'REDUCED_REDUNDANCY'|'STANDARD_IA'|'ONEZONE_IA'|'INTELLIGENT_TIERING'|'GLACIER'|'DEEP_ARCHIVE'|'OUTPOSTS'|'GLACIER_IR'|'SNOW',
'RequestCharged': 'requester',
'ReplicationStatus': 'COMPLETE'|'PENDING'|'FAILED'|'REPLICA'|'COMPLETED',
'PartsCount': 123,
'TagCount': 123,
'ObjectLockMode': 'GOVERNANCE'|'COMPLIANCE',
'ObjectLockRetainUntilDate': datetime(2015, 1, 1),
'ObjectLockLegalHoldStatus': 'ON'|'OFF'
}
Response Structure
(dict) --
Body (:class:`.StreamingBody`) --
Object data.
DeleteMarker (boolean) --
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.
AcceptRanges (string) --
Indicates that a range of bytes was specified.
Expiration (string) --
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.
Restore (string) --
Provides information about object restoration action and expiration time of the restored object copy.
LastModified (datetime) --
Creation date of the object.
ContentLength (integer) --
Size of the body in bytes.
ETag (string) --
An entity tag (ETag) is an opaque identifier assigned by a web server to a specific version of a resource found at a URL.
ChecksumCRC32 (string) --
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 .
ChecksumCRC32C (string) --
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 .
ChecksumSHA1 (string) --
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 .
ChecksumSHA256 (string) --
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 .
MissingMeta (integer) --
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.
VersionId (string) --
Version of the object.
CacheControl (string) --
Specifies caching behavior along the request/reply chain.
ContentDisposition (string) --
Specifies presentational information for the object.
ContentEncoding (string) --
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.
ContentLanguage (string) --
The language the content is in.
ContentRange (string) --
The portion of the object returned in the response.
ContentType (string) --
A standard MIME type describing the format of the object data.
Expires (datetime) --
The date and time at which the object is no longer cacheable.
WebsiteRedirectLocation (string) --
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.
ServerSideEncryption (string) --
The server-side encryption algorithm used when storing this object in Amazon S3 (for example, AES256 , aws:kms , aws:kms:dsse ).
Metadata (dict) --
A map of metadata to store with the object in S3.
(string) --
(string) --
SSECustomerAlgorithm (string) --
If server-side encryption with a customer-provided encryption key was requested, the response will include this header confirming the encryption algorithm used.
SSECustomerKeyMD5 (string) --
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.
SSEKMSKeyId (string) --
If present, specifies the ID of the Key Management Service (KMS) symmetric encryption customer managed key that was used for the object.
BucketKeyEnabled (boolean) --
Indicates whether the object uses an S3 Bucket Key for server-side encryption with Key Management Service (KMS) keys (SSE-KMS).
StorageClass (string) --
Provides storage class information of the object. Amazon S3 returns this header for all objects except for S3 Standard storage class objects.
RequestCharged (string) --
If present, indicates that the requester was successfully charged for the request.
ReplicationStatus (string) --
Amazon S3 can return this if your request involves a bucket that is either a source or destination in a replication rule.
PartsCount (integer) --
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.
TagCount (integer) --
The number of tags, if any, on the object.
ObjectLockMode (string) --
The Object Lock mode currently in place for this object.
ObjectLockRetainUntilDate (datetime) --
The date and time when this object's Object Lock will expire.
ObjectLockLegalHoldStatus (string) --
Indicates whether this object has an active legal hold. This field is only returned if you have permission to view an object's legal hold status.
{'ReplicationStatus': {'COMPLETED'}}
The HEAD action retrieves metadata from an object without returning the object itself. This action is useful if you're only interested in an object's metadata. To use HEAD , you must have READ access to the object.
A HEAD request has the same options as a GET action on an object. The response is identical to the GET response except that there is no response body. Because of this, if the HEAD request generates an error, it returns a generic 400 Bad Request , 403 Forbidden or 404 Not Found code. It is not possible to retrieve the exact exception beyond these error codes.
If you encrypt an object by using server-side encryption with customer-provided encryption keys (SSE-C) when you store the object in Amazon S3, then when you retrieve the metadata from the object, you must use the following headers:
x-amz-server-side-encryption-customer-algorithm
x-amz-server-side-encryption-customer-key
x-amz-server-side-encryption-customer-key-MD5
For more information about SSE-C, see Server-Side Encryption (Using Customer-Provided Encryption Keys).
Note
Encryption request headers, like x-amz-server-side-encryption , should not be sent for GET requests if your object uses server-side encryption with Key Management Service (KMS) keys (SSE-KMS), dual-layer server-side encryption with Amazon Web Services KMS keys (DSSE-KMS), or server-side encryption with Amazon S3 managed encryption keys (SSE-S3). If your object does use these types of keys, you’ll get an HTTP 400 Bad Request error.
The last modified property in this case is the creation date of the object.
Request headers are limited to 8 KB in size. For more information, see Common Request Headers.
Consider the following when using request headers:
Consideration 1 – If both of the If-Match and If-Unmodified-Since headers are present in the request as follows:
If-Match condition evaluates to true , and;
If-Unmodified-Since condition evaluates to false ;
Then Amazon S3 returns 200 OK and the data requested.
Consideration 2 – If both of the If-None-Match and If-Modified-Since headers are present in the request as follows:
If-None-Match condition evaluates to false , and;
If-Modified-Since condition evaluates to true ;
Then Amazon S3 returns the 304 Not Modified response code.
For more information about conditional requests, see RFC 7232.
Permissions
You need the relevant read object (or version) permission for this operation. For more information, see Actions, resources, and condition keys for Amazon S3. If the object you request doesn't exist, the error that Amazon S3 returns depends on whether you also have the s3:ListBucket permission.
If you have the s3:ListBucket permission on the bucket, Amazon S3 returns an HTTP status code 404 error.
If you don’t have the s3:ListBucket permission, Amazon S3 returns an HTTP status code 403 error.
The following actions are related to HeadObject :
See also: AWS API Documentation
Request Syntax
client.head_object(
Bucket='string',
IfMatch='string',
IfModifiedSince=datetime(2015, 1, 1),
IfNoneMatch='string',
IfUnmodifiedSince=datetime(2015, 1, 1),
Key='string',
Range='string',
VersionId='string',
SSECustomerAlgorithm='string',
SSECustomerKey=b'bytes',
SSECustomerKeyMD5='string',
RequestPayer='requester',
PartNumber=123,
ExpectedBucketOwner='string',
ChecksumMode='ENABLED'
)
string
[REQUIRED]
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 you use 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 you use this action with S3 on Outposts through the Amazon Web Services SDKs, you provide the Outposts access point ARN in place of the bucket name. For more information about S3 on Outposts ARNs, see What is S3 on Outposts? in the Amazon S3 User Guide .
string
Return the object only if its entity tag (ETag) is the same as the one specified; otherwise, return a 412 (precondition failed) error.
datetime
Return the object only if it has been modified since the specified time; otherwise, return a 304 (not modified) error.
string
Return the object only if its entity tag (ETag) is different from the one specified; otherwise, return a 304 (not modified) error.
datetime
Return the object only if it has not been modified since the specified time; otherwise, return a 412 (precondition failed) error.
string
[REQUIRED]
The object key.
string
HeadObject returns only the metadata for an object. If the Range is satisfiable, only the ContentLength is affected in the response. If the Range is not satisfiable, S3 returns a 416 - Requested Range Not Satisfiable error.
string
VersionId used to reference a specific version of the object.
string
Specifies the algorithm to use to when encrypting the object (for example, AES256).
bytes
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.
string
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.
string
Confirms that the requester knows that they will be charged for the request. Bucket owners need not specify this parameter in their requests. If either the source or destination Amazon S3 bucket has Requester Pays enabled, the requester will pay for corresponding charges to copy the object. For information about downloading objects from Requester Pays buckets, see Downloading Objects in Requester Pays Buckets in the Amazon S3 User Guide .
integer
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.
string
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).
string
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.
dict
Response Syntax
{
'DeleteMarker': True|False,
'AcceptRanges': 'string',
'Expiration': 'string',
'Restore': 'string',
'ArchiveStatus': 'ARCHIVE_ACCESS'|'DEEP_ARCHIVE_ACCESS',
'LastModified': datetime(2015, 1, 1),
'ContentLength': 123,
'ChecksumCRC32': 'string',
'ChecksumCRC32C': 'string',
'ChecksumSHA1': 'string',
'ChecksumSHA256': 'string',
'ETag': 'string',
'MissingMeta': 123,
'VersionId': 'string',
'CacheControl': 'string',
'ContentDisposition': 'string',
'ContentEncoding': 'string',
'ContentLanguage': 'string',
'ContentType': 'string',
'Expires': datetime(2015, 1, 1),
'WebsiteRedirectLocation': 'string',
'ServerSideEncryption': 'AES256'|'aws:kms'|'aws:kms:dsse',
'Metadata': {
'string': 'string'
},
'SSECustomerAlgorithm': 'string',
'SSECustomerKeyMD5': 'string',
'SSEKMSKeyId': 'string',
'BucketKeyEnabled': True|False,
'StorageClass': 'STANDARD'|'REDUCED_REDUNDANCY'|'STANDARD_IA'|'ONEZONE_IA'|'INTELLIGENT_TIERING'|'GLACIER'|'DEEP_ARCHIVE'|'OUTPOSTS'|'GLACIER_IR'|'SNOW',
'RequestCharged': 'requester',
'ReplicationStatus': 'COMPLETE'|'PENDING'|'FAILED'|'REPLICA'|'COMPLETED',
'PartsCount': 123,
'ObjectLockMode': 'GOVERNANCE'|'COMPLIANCE',
'ObjectLockRetainUntilDate': datetime(2015, 1, 1),
'ObjectLockLegalHoldStatus': 'ON'|'OFF'
}
Response Structure
(dict) --
DeleteMarker (boolean) --
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.
AcceptRanges (string) --
Indicates that a range of bytes was specified.
Expiration (string) --
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.
Restore (string) --
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.
ArchiveStatus (string) --
The archive state of the head object.
LastModified (datetime) --
Creation date of the object.
ContentLength (integer) --
Size of the body in bytes.
ChecksumCRC32 (string) --
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 .
ChecksumCRC32C (string) --
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 .
ChecksumSHA1 (string) --
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 .
ChecksumSHA256 (string) --
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 .
ETag (string) --
An entity tag (ETag) is an opaque identifier assigned by a web server to a specific version of a resource found at a URL.
MissingMeta (integer) --
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.
VersionId (string) --
Version of the object.
CacheControl (string) --
Specifies caching behavior along the request/reply chain.
ContentDisposition (string) --
Specifies presentational information for the object.
ContentEncoding (string) --
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.
ContentLanguage (string) --
The language the content is in.
ContentType (string) --
A standard MIME type describing the format of the object data.
Expires (datetime) --
The date and time at which the object is no longer cacheable.
WebsiteRedirectLocation (string) --
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.
ServerSideEncryption (string) --
The server-side encryption algorithm used when storing this object in Amazon S3 (for example, AES256 , aws:kms , aws:kms:dsse ).
Metadata (dict) --
A map of metadata to store with the object in S3.
(string) --
(string) --
SSECustomerAlgorithm (string) --
If server-side encryption with a customer-provided encryption key was requested, the response will include this header confirming the encryption algorithm used.
SSECustomerKeyMD5 (string) --
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.
SSEKMSKeyId (string) --
If present, specifies the ID of the Key Management Service (KMS) symmetric encryption customer managed key that was used for the object.
BucketKeyEnabled (boolean) --
Indicates whether the object uses an S3 Bucket Key for server-side encryption with Key Management Service (KMS) keys (SSE-KMS).
StorageClass (string) --
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.
RequestCharged (string) --
If present, indicates that the requester was successfully charged for the request.
ReplicationStatus (string) --
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.
PartsCount (integer) --
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.
ObjectLockMode (string) --
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.
ObjectLockRetainUntilDate (datetime) --
The date and time when the Object Lock retention period expires. This header is only returned if the requester has the s3:GetObjectRetention permission.
ObjectLockLegalHoldStatus (string) --
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.
{'ReplicationStatus': {'COMPLETED'}}
Passes transformed objects to a GetObject operation when using Object Lambda access points. For information about Object Lambda access points, see Transforming objects with Object Lambda access points in the Amazon S3 User Guide .
This operation supports metadata that can be returned by GetObject, in addition to RequestRoute , RequestToken , StatusCode , ErrorCode , and ErrorMessage . The GetObject response metadata is supported so that the WriteGetObjectResponse caller, typically an Lambda function, can provide the same metadata when it internally invokes GetObject . When WriteGetObjectResponse is called by a customer-owned Lambda function, the metadata returned to the end user GetObject call might differ from what Amazon S3 would normally return.
You can include any number of metadata headers. When including a metadata header, it should be prefaced with x-amz-meta . For example, x-amz-meta-my-custom-header: MyCustomValue . The primary use case for this is to forward GetObject metadata.
Amazon Web Services provides some prebuilt Lambda functions that you can use with S3 Object Lambda to detect and redact personally identifiable information (PII) and decompress S3 objects. These Lambda functions are available in the Amazon Web Services Serverless Application Repository, and can be selected through the Amazon Web Services Management Console when you create your Object Lambda access point.
Example 1: PII Access Control - This Lambda function uses Amazon Comprehend, a natural language processing (NLP) service using machine learning to find insights and relationships in text. It automatically detects personally identifiable information (PII) such as names, addresses, dates, credit card numbers, and social security numbers from documents in your Amazon S3 bucket.
Example 2: PII Redaction - This Lambda function uses Amazon Comprehend, a natural language processing (NLP) service using machine learning to find insights and relationships in text. It automatically redacts personally identifiable information (PII) such as names, addresses, dates, credit card numbers, and social security numbers from documents in your Amazon S3 bucket.
Example 3: Decompression - The Lambda function S3ObjectLambdaDecompression, is equipped to decompress objects stored in S3 in one of six compressed file formats including bzip2, gzip, snappy, zlib, zstandard and ZIP.
For information on how to view and use these functions, see Using Amazon Web Services built Lambda functions in the Amazon S3 User Guide .
See also: AWS API Documentation
Request Syntax
client.write_get_object_response(
RequestRoute='string',
RequestToken='string',
Body=b'bytes'|file,
StatusCode=123,
ErrorCode='string',
ErrorMessage='string',
AcceptRanges='string',
CacheControl='string',
ContentDisposition='string',
ContentEncoding='string',
ContentLanguage='string',
ContentLength=123,
ContentRange='string',
ContentType='string',
ChecksumCRC32='string',
ChecksumCRC32C='string',
ChecksumSHA1='string',
ChecksumSHA256='string',
DeleteMarker=True|False,
ETag='string',
Expires=datetime(2015, 1, 1),
Expiration='string',
LastModified=datetime(2015, 1, 1),
MissingMeta=123,
Metadata={
'string': 'string'
},
ObjectLockMode='GOVERNANCE'|'COMPLIANCE',
ObjectLockLegalHoldStatus='ON'|'OFF',
ObjectLockRetainUntilDate=datetime(2015, 1, 1),
PartsCount=123,
ReplicationStatus='COMPLETE'|'PENDING'|'FAILED'|'REPLICA'|'COMPLETED',
RequestCharged='requester',
Restore='string',
ServerSideEncryption='AES256'|'aws:kms'|'aws:kms:dsse',
SSECustomerAlgorithm='string',
SSEKMSKeyId='string',
SSECustomerKeyMD5='string',
StorageClass='STANDARD'|'REDUCED_REDUNDANCY'|'STANDARD_IA'|'ONEZONE_IA'|'INTELLIGENT_TIERING'|'GLACIER'|'DEEP_ARCHIVE'|'OUTPOSTS'|'GLACIER_IR'|'SNOW',
TagCount=123,
VersionId='string',
BucketKeyEnabled=True|False
)
string
[REQUIRED]
Route prefix to the HTTP URL generated.
string
[REQUIRED]
A single use encrypted token that maps WriteGetObjectResponse to the end user GetObject request.
bytes or seekable file-like object
The object data.
integer
The integer status code for an HTTP response of a corresponding GetObject request. The following is a list of status codes.
200 - OK
206 - Partial Content
304 - Not Modified
400 - Bad Request
401 - Unauthorized
403 - Forbidden
404 - Not Found
405 - Method Not Allowed
409 - Conflict
411 - Length Required
412 - Precondition Failed
416 - Range Not Satisfiable
500 - Internal Server Error
503 - Service Unavailable
string
A string that uniquely identifies an error condition. Returned in the <Code> tag of the error XML response for a corresponding GetObject call. Cannot be used with a successful StatusCode header or when the transformed object is provided in the body. All error codes from S3 are sentence-cased. The regular expression (regex) value is "^[A-Z][a-zA-Z]+$" .
string
Contains a generic description of the error condition. Returned in the <Message> tag of the error XML response for a corresponding GetObject call. Cannot be used with a successful StatusCode header or when the transformed object is provided in body.
string
Indicates that a range of bytes was specified.
string
Specifies caching behavior along the request/reply chain.
string
Specifies presentational information for the object.
string
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.
string
The language the content is in.
integer
The size of the content body in bytes.
string
The portion of the object returned in the response.
string
A standard MIME type describing the format of the object data.
string
This header can be used as a data integrity check to verify that the data received is the same data that was originally sent. This specifies the base64-encoded, 32-bit CRC32 checksum of the object returned by the Object Lambda function. This may not match the checksum for the object stored in Amazon S3. Amazon S3 will perform validation of the checksum values only when the original GetObject request required checksum validation. For more information about checksums, see Checking object integrity in the Amazon S3 User Guide .
Only one checksum header can be specified at a time. If you supply multiple checksum headers, this request will fail.
string
This header can be used as a data integrity check to verify that the data received is the same data that was originally sent. This specifies the base64-encoded, 32-bit CRC32C checksum of the object returned by the Object Lambda function. This may not match the checksum for the object stored in Amazon S3. Amazon S3 will perform validation of the checksum values only when the original GetObject request required checksum validation. For more information about checksums, see Checking object integrity in the Amazon S3 User Guide .
Only one checksum header can be specified at a time. If you supply multiple checksum headers, this request will fail.
string
This header can be used as a data integrity check to verify that the data received is the same data that was originally sent. This specifies the base64-encoded, 160-bit SHA-1 digest of the object returned by the Object Lambda function. This may not match the checksum for the object stored in Amazon S3. Amazon S3 will perform validation of the checksum values only when the original GetObject request required checksum validation. For more information about checksums, see Checking object integrity in the Amazon S3 User Guide .
Only one checksum header can be specified at a time. If you supply multiple checksum headers, this request will fail.
string
This header can be used as a data integrity check to verify that the data received is the same data that was originally sent. This specifies the base64-encoded, 256-bit SHA-256 digest of the object returned by the Object Lambda function. This may not match the checksum for the object stored in Amazon S3. Amazon S3 will perform validation of the checksum values only when the original GetObject request required checksum validation. For more information about checksums, see Checking object integrity in the Amazon S3 User Guide .
Only one checksum header can be specified at a time. If you supply multiple checksum headers, this request will fail.
boolean
Specifies whether an object stored in Amazon S3 is ( true ) or is not ( false ) a delete marker.
string
An opaque identifier assigned by a web server to a specific version of a resource found at a URL.
datetime
The date and time at which the object is no longer cacheable.
string
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 that provide the object expiration information. The value of the rule-id is URL-encoded.
datetime
The date and time that the object was last modified.
integer
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.
dict
A map of metadata to store with the object in S3.
(string) --
(string) --
string
Indicates whether an object stored in Amazon S3 has Object Lock enabled. For more information about S3 Object Lock, see Object Lock.
string
Indicates whether an object stored in Amazon S3 has an active legal hold.
datetime
The date and time when Object Lock is configured to expire.
integer
The count of parts this object has.
string
Indicates if request involves bucket that is either a source or destination in a Replication rule. For more information about S3 Replication, see Replication.
string
If present, indicates that the requester was successfully charged for the request.
string
Provides information about object restoration operation and expiration time of the restored object copy.
string
The server-side encryption algorithm used when storing requested object in Amazon S3 (for example, AES256, aws:kms ).
string
Encryption algorithm used if server-side encryption with a customer-provided encryption key was specified for object stored in Amazon S3.
string
If present, specifies the ID (Key ID, Key ARN, or Key Alias) of the Amazon Web Services Key Management Service (Amazon Web Services KMS) symmetric encryption customer managed key that was used for stored in Amazon S3 object.
string
128-bit MD5 digest of customer-provided encryption key used in Amazon S3 to encrypt data stored in S3. For more information, see Protecting data using server-side encryption with customer-provided encryption keys (SSE-C).
string
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.
integer
The number of tags, if any, on the object.
string
An ID used to reference a specific version of the object.
boolean
Indicates whether the object stored in Amazon S3 uses an S3 bucket key for server-side encryption with Amazon Web Services KMS (SSE-KMS).
None