ObjectSummary / Action / get

get#

S3.ObjectSummary.get(**kwargs)#

Retrieves an object from Amazon S3.

In the GetObject request, specify the full key name for the object.

General purpose buckets - Both the virtual-hosted-style requests and the path-style requests are supported. For a virtual hosted-style request example, if you have the object photos/2006/February/sample.jpg, specify the object key name 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 object key name as /examplebucket/photos/2006/February/sample.jpg. For more information about request types, see HTTP Host Header Bucket Specification in the Amazon S3 User Guide.

Directory buckets - Only virtual-hosted-style requests are supported. For a virtual hosted-style request example, if you have the object photos/2006/February/sample.jpg in the bucket named examplebucket--use1-az5--x-s3, specify the object key name as /photos/2006/February/sample.jpg. Also, when you make requests to this API operation, your requests are sent to the Zonal endpoint. These endpoints support virtual-hosted-style requests in the format ``https://bucket_name.s3express-az_id.region.amazonaws.com/key-name ``. Path-style requests are not supported. For more information, see Regional and Zonal endpoints in the Amazon S3 User Guide.

Permissions

  • General purpose bucket permissions - You must have the required permissions in a policy. To use GetObject, you must have the READ access to the object (or version). If you grant READ access to the anonymous user, the GetObject operation returns the object without using an authorization header. For more information, see Specifying permissions in a policy in the Amazon S3 User Guide. If you include a versionId in your request header, you must have the s3:GetObjectVersion permission to access a specific version of an object. The s3:GetObject permission is not required in this scenario. If you request the current version of an object without a specific versionId in the request header, only the s3:GetObject permission is required. The s3:GetObjectVersion permission is not required in this scenario. 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.

  • Directory bucket permissions - To grant access to this API operation on a directory bucket, we recommend that you use the CreateSession API operation for session-based authorization. Specifically, you grant the s3express:CreateSession permission to the directory bucket in a bucket policy or an IAM identity-based policy. Then, you make the CreateSession API call on the bucket to obtain a session token. With the session token in your request header, you can make API requests to this operation. After the session token expires, you make another CreateSession API call to generate a new session token for use. Amazon Web Services CLI or SDKs create session and refresh the session token automatically to avoid service interruptions when a session expires. For more information about authorization, see CreateSession. If the object is encrypted using SSE-KMS, you must also have the kms:GenerateDataKey and kms:Decrypt permissions in IAM identity-based policies and KMS key policies for the KMS key.

    Storage classes

If the object you are retrieving is stored in the S3 Glacier Flexible Retrieval storage class, the S3 Glacier Deep Archive storage class, the S3 Intelligent-Tiering Archive Access tier, or the S3 Intelligent-Tiering Deep Archive Access tier, before you can retrieve the object you must first restore a copy using RestoreObject. Otherwise, this operation returns an InvalidObjectState error. For information about restoring archived objects, see Restoring Archived Objects in the Amazon S3 User Guide.

Directory buckets - For directory buckets, only the S3 Express One Zone storage class is supported to store newly created objects. Unsupported storage class values won’t write a destination object and will respond with the HTTP status code 400 Bad Request.

Encryption

Encryption request headers, like x-amz-server-side-encryption, should not be sent for the GetObject requests, if your object uses server-side encryption with Amazon S3 managed encryption keys (SSE-S3), server-side encryption with Key Management Service (KMS) keys (SSE-KMS), or dual-layer server-side encryption with Amazon Web Services KMS keys (DSSE-KMS). If you include the header in your GetObject requests for the object that uses these types of keys, you’ll get an HTTP 400 Bad Request error.

Directory buckets - For directory buckets, there are only two supported options for server-side encryption: SSE-S3 and SSE-KMS. SSE-C isn’t supported. For more information, see Protecting data with server-side encryption in the Amazon S3 User Guide.

Overriding response header values through the request

There are times when you want to override certain response header values of a GetObject response. For example, you might override the Content-Disposition response header value through your GetObject request.

You can override values for a set of response headers. These modified response header values are included only in a successful response, that is, when the HTTP status code 200 OK is returned. The headers you can override using the following query parameters in the request are a subset of the headers that Amazon S3 accepts when you create an object.

The response headers that you can override for the GetObject response are Cache-Control, Content-Disposition, Content-Encoding, Content-Language, Content-Type, and Expires.

To override values for a set of response headers in the GetObject response, you can use the following query parameters in the request.

  • response-cache-control

  • response-content-disposition

  • response-content-encoding

  • response-content-language

  • response-content-type

  • response-expires

Note

When you use these parameters, you must sign the request by using either an Authorization header or a presigned URL. These parameters cannot be used with an unsigned (anonymous) request.

HTTP Host header syntax

Directory buckets - The HTTP Host header syntax is Bucket_name.s3express-az_id.region.amazonaws.com.

The following operations are related to GetObject:

See also: AWS API Documentation

Request Syntax

response = object_summary.get(
    IfMatch='string',
    IfModifiedSince=datetime(2015, 1, 1),
    IfNoneMatch='string',
    IfUnmodifiedSince=datetime(2015, 1, 1),
    Range='string',
    ResponseCacheControl='string',
    ResponseContentDisposition='string',
    ResponseContentEncoding='string',
    ResponseContentLanguage='string',
    ResponseContentType='string',
    ResponseExpires=datetime(2015, 1, 1),
    VersionId='string',
    SSECustomerAlgorithm='string',
    SSECustomerKey='string',
    RequestPayer='requester',
    PartNumber=123,
    ExpectedBucketOwner='string',
    ChecksumMode='ENABLED'
)
Parameters:

  • IfMatch (string) –

    Return the object only if its entity tag (ETag) is the same as the one specified in this header; otherwise, return a 412 Precondition Failed error.

    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.

    For more information about conditional requests, see RFC 7232.

  • IfModifiedSince (datetime) –

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

    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 status code.

    For more information about conditional requests, see RFC 7232.

  • IfNoneMatch (string) –

    Return the object only if its entity tag (ETag) is different from the one specified in this header; otherwise, return a 304 Not Modified error.

    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 HTTP status code.

    For more information about conditional requests, see RFC 7232.

  • IfUnmodifiedSince (datetime) –

    Return the object only if it has not been modified since the specified time; otherwise, return a 412 Precondition Failed error.

    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.

    For more information about conditional requests, see RFC 7232.

  • Range (string) –

    Downloads the specified byte range 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.

  • ResponseCacheControl (string) – Sets the Cache-Control header of the response.

  • ResponseContentDisposition (string) – Sets the Content-Disposition header of the response.

  • ResponseContentEncoding (string) – Sets the Content-Encoding header of the response.

  • ResponseContentLanguage (string) – Sets the Content-Language header of the response.

  • ResponseContentType (string) – Sets the Content-Type header of the response.

  • ResponseExpires (datetime) – Sets the Expires header of the response.

  • VersionId (string) –

    Version ID used to reference a specific version of the object.

    By default, the GetObject operation returns the current version of an object. To return a different version, use the versionId subresource.

    Note

    • If you include a versionId in your request header, you must have the s3:GetObjectVersion permission to access a specific version of an object. The s3:GetObject permission is not required in this scenario.

    • If you request the current version of an object without a specific versionId in the request header, only the s3:GetObject permission is required. The s3:GetObjectVersion permission is not required in this scenario.

    • Directory buckets - S3 Versioning isn’t enabled and supported for directory buckets. For this API operation, only the null value of the version ID is supported by directory buckets. You can only specify null to the versionId query parameter in the request.

    For more information about versioning, see PutBucketVersioning.

  • SSECustomerAlgorithm (string) –

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

    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) in the Amazon S3 User Guide.

    Note

    This functionality is not supported for directory buckets.

  • SSECustomerKey (string) –

    Specifies the customer-provided encryption key that you originally provided for Amazon S3 to encrypt the data before storing it. 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.

    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) in the Amazon S3 User Guide.

    Note

    This functionality is not supported for directory buckets.

  • SSECustomerKeyMD5 (string) –

    Specifies the 128-bit MD5 digest of the customer-provided 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.

    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) in the Amazon S3 User Guide.

    Note

    This functionality is not supported for directory buckets.

    Please note that this parameter is automatically populated if it is not provided. Including this parameter is not required

  • RequestPayer (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 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.

    Note

    This functionality is not supported for directory buckets.

  • PartNumber (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.

  • ExpectedBucketOwner (string) – The account ID of the expected bucket owner. If the account ID that you provide does not match the actual owner of the bucket, the request fails with the HTTP status code 403 Forbidden (access denied).

  • ChecksumMode (string) –

    To retrieve the checksum, this mode must be enabled.

    General purpose buckets - In addition, if you enable checksum mode and the object is uploaded with a checksum and encrypted with an Key Management Service (KMS) key, you must have permission to use the kms:Decrypt action to retrieve the checksum.

Return type:

dict

Returns:

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),
    'ExpiresString': 'string',
    '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'|'EXPRESS_ONEZONE',
    '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 (StreamingBody) –

      Object data.

    • DeleteMarker (boolean) –

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

      Note

      • 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.

      • If the specified version in the request is a delete marker, the response returns a 405 Method Not Allowed error and the Last-Modified: timestamp response header.

    • AcceptRanges (string) –

      Indicates that a range of bytes was specified in the request.

    • Expiration (string) –

      If the object expiration is configured (see PutBucketLifecycleConfiguration), 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.

      Note

      This functionality is not supported for directory buckets.

    • Restore (string) –

      Provides information about object restoration action and expiration time of the restored object copy.

      Note

      This functionality is not supported for directory buckets. Only the S3 Express One Zone storage class is supported by directory buckets to store objects.

    • LastModified (datetime) –

      Date and time when the object was last modified.

      General purpose buckets - When you specify a versionId of the object in your request, if the specified version in the request is a delete marker, the response returns a 405 Method Not Allowed error and the Last-Modified: timestamp response header.

    • 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 CRC-32 checksum of the object. This will only be present if it was uploaded with the object. For more information, see Checking object integrity in the Amazon S3 User Guide.

    • ChecksumCRC32C (string) –

      The base64-encoded, 32-bit CRC-32C checksum of the object. This will only be present if it was uploaded with the object. For more information, 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. For more information, 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. For more information, see Checking object integrity in the Amazon S3 User Guide.

    • MissingMeta (integer) –

      This is set to the number of metadata entries not returned in the headers that are prefixed with x-amz-meta-. 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.

      Note

      This functionality is not supported for directory buckets.

    • VersionId (string) –

      Version ID of the object.

      Note

      This functionality is not supported for directory buckets.

    • CacheControl (string) –

      Specifies caching behavior along the request/reply chain.

    • ContentDisposition (string) –

      Specifies presentational information for the object.

    • ContentEncoding (string) –

      Indicates 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.

      Note

      This member has been deprecated. Please use ExpiresString instead.

    • ExpiresString (string) –

      The raw, unparsed value of the Expires field.

    • 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.

      Note

      This functionality is not supported for directory buckets.

    • ServerSideEncryption (string) –

      The server-side encryption algorithm used when you store this object in Amazon S3.

    • 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 to confirm the encryption algorithm that’s used.

      Note

      This functionality is not supported for directory buckets.

    • SSECustomerKeyMD5 (string) –

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

      Note

      This functionality is not supported for directory buckets.

    • SSEKMSKeyId (string) –

      If present, indicates the ID of the KMS key that was used for object encryption.

    • 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.

      Note

      Directory buckets - Only the S3 Express One Zone storage class is supported by directory buckets to store objects.

    • RequestCharged (string) –

      If present, indicates that the requester was successfully charged for the request.

      Note

      This functionality is not supported for directory buckets.

    • ReplicationStatus (string) –

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

      Note

      This functionality is not supported for directory buckets.

    • 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, when you have the relevant permission to read object tags.

      You can use GetObjectTagging to retrieve the tag set associated with an object.

      Note

      This functionality is not supported for directory buckets.

    • ObjectLockMode (string) –

      The Object Lock mode that’s currently in place for this object.

      Note

      This functionality is not supported for directory buckets.

    • ObjectLockRetainUntilDate (datetime) –

      The date and time when this object’s Object Lock will expire.

      Note

      This functionality is not supported for directory buckets.

    • 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.

      Note

      This functionality is not supported for directory buckets.