CompleteMultipartUpload - Amazon Simple Storage Service
Services or capabilities described in Amazon Web Services documentation might vary by Region. To see the differences applicable to the China Regions, see Getting Started with Amazon Web Services in China.

CompleteMultipartUpload

Completes a multipart upload by assembling previously uploaded parts.

You first initiate the multipart upload and then upload all parts using the UploadPart operation. After successfully uploading all relevant parts of an upload, you call this action to complete the upload. Upon receiving this request, Amazon S3 concatenates all the parts in ascending order by part number to create a new object. In the Complete Multipart Upload request, you must provide the parts list. You must ensure that the parts list is complete. This action concatenates the parts that you provide in the list. For each part in the list, you must provide the part number and the ETag value, returned after that part was uploaded.

Processing of a Complete Multipart Upload request could take several minutes to complete. After Amazon S3 begins processing the request, it sends an HTTP response header that specifies a 200 OK response. While processing is in progress, Amazon S3 periodically sends white space characters to keep the connection from timing out. Because a request could fail after the initial 200 OK response has been sent, it is important that you check the response body to determine whether the request succeeded.

Note that if CompleteMultipartUpload fails, applications should be prepared to retry the failed requests. For more information, see Amazon S3 Error Best Practices.

Important

You cannot use Content-Type: application/x-www-form-urlencoded with Complete Multipart Upload requests. Also, if you do not provide a Content-Type header, CompleteMultipartUpload returns a 200 OK response.

For more information about multipart uploads, see Uploading Objects Using Multipart Upload.

For information about permissions required to use the multipart upload API, see Multipart Upload and Permissions.

CompleteMultipartUpload has the following special errors:

  • Error code: EntityTooSmall

    • Description: Your proposed upload is smaller than the minimum allowed object size. Each part must be at least 5 MB in size, except the last part.

    • 400 Bad Request

  • Error code: InvalidPart

    • Description: One or more of the specified parts could not be found. The part might not have been uploaded, or the specified entity tag might not have matched the part's entity tag.

    • 400 Bad Request

  • Error code: InvalidPartOrder

    • Description: The list of parts was not in ascending order. The parts list must be specified in order by part number.

    • 400 Bad Request

  • Error code: NoSuchUpload

    • Description: The specified multipart upload does not exist. The upload ID might be invalid, or the multipart upload might have been aborted or completed.

    • 404 Not Found

The following operations are related to CompleteMultipartUpload:

Request Syntax

POST /Key+?uploadId=UploadId HTTP/1.1 Host: Bucket.s3.amazonaws.com x-amz-checksum-crc32: ChecksumCRC32 x-amz-checksum-crc32c: ChecksumCRC32C x-amz-checksum-sha1: ChecksumSHA1 x-amz-checksum-sha256: ChecksumSHA256 x-amz-request-payer: RequestPayer x-amz-expected-bucket-owner: ExpectedBucketOwner x-amz-server-side-encryption-customer-algorithm: SSECustomerAlgorithm x-amz-server-side-encryption-customer-key: SSECustomerKey x-amz-server-side-encryption-customer-key-MD5: SSECustomerKeyMD5 <?xml version="1.0" encoding="UTF-8"?> <CompleteMultipartUpload xmlns="http://s3.amazonaws.com/doc/2006-03-01/"> <Part> <ChecksumCRC32>string</ChecksumCRC32> <ChecksumCRC32C>string</ChecksumCRC32C> <ChecksumSHA1>string</ChecksumSHA1> <ChecksumSHA256>string</ChecksumSHA256> <ETag>string</ETag> <PartNumber>integer</PartNumber> </Part> ... </CompleteMultipartUpload>

URI Request Parameters

The request uses the following URI parameters.

Bucket

Name of the bucket to which the multipart upload was initiated.

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 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 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.

Required: Yes

Key

Object key for which the multipart upload was initiated.

Length Constraints: Minimum length of 1.

Required: Yes

uploadId

ID for the initiated multipart upload.

Required: Yes

x-amz-checksum-crc32

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 header specifies the base64-encoded, 32-bit CRC32 checksum of the object. For more information, see Checking object integrity in the Amazon S3 User Guide.

x-amz-checksum-crc32c

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 header specifies the base64-encoded, 32-bit CRC32C checksum of the object. For more information, see Checking object integrity in the Amazon S3 User Guide.

x-amz-checksum-sha1

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 header specifies the base64-encoded, 160-bit SHA-1 digest of the object. For more information, see Checking object integrity in the Amazon S3 User Guide.

x-amz-checksum-sha256

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 header specifies the base64-encoded, 256-bit SHA-256 digest of the object. For more information, see Checking object integrity in the Amazon S3 User Guide.

x-amz-expected-bucket-owner

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).

x-amz-request-payer

Confirms that the requester knows that they will be charged for the request. Bucket owners need not specify this parameter in their requests. For information about downloading objects from Requester Pays buckets, see Downloading Objects in Requester Pays Buckets in the Amazon S3 User Guide.

Valid Values: requester

x-amz-server-side-encryption-customer-algorithm

The server-side encryption (SSE) algorithm used to encrypt the object. This parameter is needed only when the object was created using a checksum algorithm. For more information, see Protecting data using SSE-C keys in the Amazon S3 User Guide.

x-amz-server-side-encryption-customer-key

The server-side encryption (SSE) customer managed key. This parameter is needed only when the object was created using a checksum algorithm. For more information, see Protecting data using SSE-C keys in the Amazon S3 User Guide.

x-amz-server-side-encryption-customer-key-MD5

The MD5 server-side encryption (SSE) customer managed key. This parameter is needed only when the object was created using a checksum algorithm. For more information, see Protecting data using SSE-C keys in the Amazon S3 User Guide.

Request Body

The request accepts the following data in XML format.

CompleteMultipartUpload

Root level tag for the CompleteMultipartUpload parameters.

Required: Yes

Part

Array of CompletedPart data types.

If you do not supply a valid Part with your request, the service sends back an HTTP 400 response.

Type: Array of CompletedPart data types

Required: No

Response Syntax

HTTP/1.1 200 x-amz-expiration: Expiration x-amz-server-side-encryption: ServerSideEncryption x-amz-version-id: VersionId x-amz-server-side-encryption-aws-kms-key-id: SSEKMSKeyId x-amz-server-side-encryption-bucket-key-enabled: BucketKeyEnabled x-amz-request-charged: RequestCharged <?xml version="1.0" encoding="UTF-8"?> <CompleteMultipartUploadResult> <Location>string</Location> <Bucket>string</Bucket> <Key>string</Key> <ETag>string</ETag> <ChecksumCRC32>string</ChecksumCRC32> <ChecksumCRC32C>string</ChecksumCRC32C> <ChecksumSHA1>string</ChecksumSHA1> <ChecksumSHA256>string</ChecksumSHA256> </CompleteMultipartUploadResult>

Response Elements

If the action is successful, the service sends back an HTTP 200 response.

The response returns the following HTTP headers.

x-amz-expiration

If the object expiration is configured, this will contain the expiration date (expiry-date) and rule ID (rule-id). The value of rule-id is URL-encoded.

x-amz-request-charged

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

Valid Values: requester

x-amz-server-side-encryption

The server-side encryption algorithm used when storing this object in Amazon S3 (for example, AES256, aws:kms).

Valid Values: AES256 | aws:kms

x-amz-server-side-encryption-aws-kms-key-id

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

x-amz-server-side-encryption-bucket-key-enabled

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

x-amz-version-id

Version ID of the newly created object, in case the bucket has versioning turned on.

The following data is returned in XML format by the service.

CompleteMultipartUploadResult

Root level tag for the CompleteMultipartUploadResult parameters.

Required: Yes

Bucket

The name of the bucket that contains the newly created object. Does not return the access point ARN or access point alias if used.

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 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 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.

Type: String

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.

Type: String

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.

Type: String

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.

Type: String

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.

Type: String

ETag

Entity tag that identifies the newly created object's data. Objects with different object data will have different entity tags. The entity tag is an opaque string. The entity tag may or may not be an MD5 digest of the object data. If the entity tag is not an MD5 digest of the object data, it will contain one or more nonhexadecimal characters and/or will consist of less than 32 or more than 32 hexadecimal digits. For more information about how the entity tag is calculated, see Checking object integrity in the Amazon S3 User Guide.

Type: String

Key

The object key of the newly created object.

Type: String

Length Constraints: Minimum length of 1.

Location

The URI that identifies the newly created object.

Type: String

Examples

Sample Request

The following Complete Multipart Upload request specifies three parts in the CompleteMultipartUpload element.

POST /example-object?uploadId=AAAsb2FkIElEIGZvciBlbHZpbmcncyWeeS1tb3ZpZS5tMnRzIRRwbG9hZA HTTP/1.1 Host: example-bucket.s3.<Region>.amazonaws.com Date: Mon, 1 Nov 2010 20:34:56 GMT Content-Length: 391 Authorization: authorization string <CompleteMultipartUpload> <Part> <PartNumber>1</PartNumber> <ETag>"a54357aff0632cce46d942af68356b38"</ETag> </Part> <Part> <PartNumber>2</PartNumber> <ETag>"0c78aef83f66abc1fa1e8477f296d394"</ETag> </Part> <Part> <PartNumber>3</PartNumber> <ETag>"acbd18db4cc2f85cedef654fccc4a4d8"</ETag> </Part> </CompleteMultipartUpload>

Sample Response

The following response indicates that an object was successfully assembled.

HTTP/1.1 200 OK x-amz-id-2: Uuag1LuByRx9e6j5Onimru9pO4ZVKnJ2Qz7/C1NPcfTWAtRPfTaOFg== x-amz-request-id: 656c76696e6727732072657175657374 Date: Mon, 1 Nov 2010 20:34:56 GMT Connection: close Server: AmazonS3 <?xml version="1.0" encoding="UTF-8"?> <CompleteMultipartUploadResult xmlns="http://s3.amazonaws.com/doc/2006-03-01/"> <Location>http://Example-Bucket.s3.<Region>.amazonaws.com/Example-Object</Location> <Bucket>Example-Bucket</Bucket> <Key>Example-Object</Key> <ETag>"3858f62230ac3c915f300c664312c11f-9"</ETag> </CompleteMultipartUploadResult>

Sample Response: Error specified in header

The following response indicates that an error occurred before the HTTP response header was sent.

HTTP/1.1 403 Forbidden x-amz-id-2: Uuag1LuByRx9e6j5Onimru9pO4ZVKnJ2Qz7/C1NPcfTWAtRPfTaOFg== x-amz-request-id: 656c76696e6727732072657175657374 Date: Mon, 1 Nov 2010 20:34:56 GMT Content-Length: 237 Connection: keep-alive Server: AmazonS3 <?xml version="1.0" encoding="UTF-8"?> <Error> <Code>AccessDenied</Code> <Message>Access Denied</Message> <RequestId>656c76696e6727732072657175657374</RequestId> <HostId>Uuag1LuByRx9e6j5Onimru9pO4ZVKnJ2Qz7/C1NPcfTWAtRPfTaOFg==</HostId> </Error>

Sample Response: Error specified in body

The following response indicates that an error occurred after the HTTP response header was sent. Note that while the HTTP status code is 200 OK, the request actually failed as described in the Error element.

HTTP/1.1 200 OK x-amz-id-2: Uuag1LuByRx9e6j5Onimru9pO4ZVKnJ2Qz7/C1NPcfTWAtRPfTaOFg== x-amz-request-id: 656c76696e6727732072657175657374 Date: Mon, 1 Nov 2010 20:34:56 GMT Connection: close Server: AmazonS3 <?xml version="1.0" encoding="UTF-8"?> <Error> <Code>InternalError</Code> <Message>We encountered an internal error. Please try again.</Message> <RequestId>656c76696e6727732072657175657374</RequestId> <HostId>Uuag1LuByRx9e6j5Onimru9pO4ZVKnJ2Qz7/C1NPcfTWAtRPfTaOFg==</HostId> </Error>

See Also

For more information about using this API in one of the language-specific Amazon SDKs, see the following: