Request Syntax URI Request Parameters Request Body Response Syntax Response Elements Examples See Also

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 or the UploadPartCopy operation. After successfully uploading all relevant parts of an upload, you call this CompleteMultipartUpload operation 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 CompleteMultipartUpload request, you must provide the parts list and ensure that the parts list is complete. The CompleteMultipartUpload API operation concatenates the parts that you provide in the list. For each part in the list, you must provide the PartNumber value and the ETag value that are returned after that part was uploaded.

The processing of a CompleteMultipartUpload request could take several minutes to finalize. 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. A request could fail after the initial 200 OK response has been sent. This means that a 200 OK response can contain either a success or an error. The error response might be embedded in the 200 OK response. If you call this API operation directly, make sure to design your application to parse the contents of the response and handle it appropriately. If you use AWS SDKs, SDKs handle this condition. The SDKs detect the embedded error and apply error handling per your configuration settings (including automatically retrying the request as appropriate). If the condition persists, the SDKs throw an exception (or, for the SDKs that don't use exceptions, they return an error).

Note that if CompleteMultipartUpload fails, applications should be prepared to retry any failed requests (including 500 error responses). For more information, see Amazon S3 Error Best Practices.

Important

You can't use Content-Type: application/x-www-form-urlencoded for the CompleteMultipartUpload requests. Also, if you don't provide a Content-Type header, CompleteMultipartUpload can still return a 200 OK response.

For more information about multipart uploads, see Uploading Objects Using Multipart Upload in the Amazon S3 User Guide.

Note

Directory buckets - For directory buckets, you must make requests for this API operation 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 - For information about permissions required to use the multipart upload API, see Multipart Upload and Permissions in the Amazon S3 User Guide.

If you provide an additional checksum value in your MultipartUpload requests and the object is encrypted with AWS Key Management Service, you must have permission to use the kms:Decrypt action for the CompleteMultipartUpload request to succeed.
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. AWS 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 with SSE-KMS, you must also have the kms:GenerateDataKey and kms:Decrypt permissions in IAM identity-based policies and AWS KMS key policies for the AWS KMS key.

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.
- HTTP Status Code: 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 ETag might not have matched the uploaded part's ETag.
- HTTP Status Code: 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.
- HTTP Status Code: 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.
- HTTP Status Code: 404 Not Found

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 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
If-None-Match: IfNoneMatch
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.

Directory buckets - When you use this operation with a directory bucket, you must use virtual-hosted-style requests in the format Bucket_name.s3express-az_id.region.amazonaws.com. Path-style requests are not supported. Directory bucket names must be unique in the chosen Availability Zone. Bucket names must follow the format bucket_base_name--az-id--x-s3 (for example, DOC-EXAMPLE-BUCKET--usw2-az1--x-s3). For information about bucket naming restrictions, see Directory bucket naming rules in the Amazon S3 User Guide.

Access points - When you use this action with an access point, you must provide the alias of the access point in place of the bucket name or specify the access point ARN. When using the access point ARN, 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 AWS 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.

Note

Access points and Object Lambda access points are not supported by directory buckets.

S3 on Outposts - 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 AWS 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

If-None-Match

Uploads the object only if the object key name does not already exist in the bucket specified. Otherwise, Amazon S3 returns a 412 Precondition Failed error.

If a conflicting operation occurs during the upload S3 returns a 409 ConditionalRequestConflict response. On a 409 failure you should re-initiate the multipart upload with CreateMultipartUpload and re-upload each part.

Expects the '*' (asterisk) character.

For more information about conditional requests, see RFC 7232, or Conditional requests in the Amazon S3 User Guide.

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 CRC-32 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 CRC-32C 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 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).

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. 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.

Valid Values: requester

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

The server-side encryption (SSE) algorithm used to encrypt the object. This parameter is required only when the object was created using a checksum algorithm or if your bucket policy requires the use of SSE-C. For more information, see Protecting data using SSE-C keys in the Amazon S3 User Guide.

Note

This functionality is not supported for directory buckets.

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.

Note

This functionality is not supported for directory buckets.

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.

Note

This functionality is not supported for directory buckets.

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.

Note

This functionality is not supported for directory buckets.

x-amz-request-charged

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

Note

This functionality is not supported for directory buckets.

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 | aws:kms:dsse

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

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

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

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

x-amz-version-id

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

Note

This functionality is not supported for directory buckets.

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.

Note

Access points are not supported by directory buckets.

Type: String

ChecksumCRC32

The base64-encoded, 32-bit CRC-32 checksum of the object. This will only be present if it was uploaded with the object. When you use an API operation on an object that was uploaded using multipart uploads, this value may not be a direct checksum value of the full object. Instead, it's a calculation based on the checksum values of each individual part. 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 CRC-32C checksum of the object. This will only be present if it was uploaded with the object. When you use an API operation on an object that was uploaded using multipart uploads, this value may not be a direct checksum value of the full object. Instead, it's a calculation based on the checksum values of each individual part. 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. When you use the API operation on an object that was uploaded using multipart uploads, this value may not be a direct checksum value of the full object. Instead, it's a calculation based on the checksum values of each individual part. 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. When you use an API operation on an object that was uploaded using multipart uploads, this value may not be a direct checksum value of the full object. Instead, it's a calculation based on the checksum values of each individual part. 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 for general purpose buckets

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 for general purpose buckets

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 for general purpose buckets: 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 for general purpose buckets: 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>