Updated on 2025-08-22 GMT+08:00

Copying Parts

Functions

After a multipart upload task is created, you can upload parts for this task using the obtained multipart upload ID. For details about the multipart upload, see Multipart Upload. Alternatively, you can make an API call to copy a part or a whole uploaded object as a part.

This operation supports server-side encryption.

You cannot determine whether a request is successful only based on the status_code in the returned HTTP header. If 200 is returned for status_code, the server has received the request and started to process the request. The copy is successful only when the body in the response contains ETag.

Copy the source object and save it as part1. If a part1 already exists before the copying, the original part1 will be overwritten by the newly copied part1. After the copy is successful, only the latest part1 is displayed. The old part1 data will be deleted. Therefore, ensure that the target part does not exist or has no value when using the part copy operation. Otherwise, data may be deleted by mistake. The source object in the copy process does not change.

Archive Objects

If source objects are in the Archive storage class, ensure that these objects have been restored before you copy them. If the source object is not restored or is being restored, the copy fails and error 403 Forbidden is returned. The fault is described as follows:

ErrorCode: InvalidObjectState

ErrorMessage: Operation is not valid for the source object's storage class

Request Syntax

PUT /ObjectName?partNumber=partNum&uploadId=UploadID HTTP/1.1 
Host: bucketname.obs.region.myhuaweicloud.com 
Date: date
x-obs-copy-source: sourceobject
x-obs-copy-source-range:bytes=start-end
Authorization: authorization
Content-Length: length

Request Parameters

To copy a part, you need to specify the part number of the target part and the multipart upload task number. Table 1 describes the parameters.

Table 1 Request parameters

Parameter

Mandatory (Yes/No)

Type

Description

partNumber

Yes

Integer

Definition:

Indicates the ID of a part to be uploaded.

Constraints:

None

Range:

An integer ranging from 1 to 10000.

Default value:

None

uploadId

Yes

String

Definition:

ID of a multipart upload task.

Constraints:

None

Range:

The value must contain 1 to 32 characters.

Default value:

None

Request Headers

In addition to the common message headers, the request uses two extended headers. Table 2 describes the common message headers.

Table 2 Request headers

Parameter

Mandatory (Yes/No)

Type

Description

x-obs-copy-source

Yes

String

Definition:

Indicates the source object to be copied.

Example: x-obs-copy-source:/SourceBucketName/SourceObjectName

Constraints:

Full-width characters and percent signs (%) must be URL-encoded.

Range:

None

Default value:

None

x-obs-copy-source-range

No

Integer

Definition:

Byte range of the part to be copied in the source object.

Constraints:

None

Range:

The minimum value is 0 and the maximum value is the object length minus 1.

Default value:

None

x-obs-server-side-encryption-customer-algorithm

Yes only when SSE-C is used. The encryption algorithm must be the same as that used to initiate multipart upload tasks.

String

Definition:

Indicates the encryption algorithm for the part copy when SSE-C is used.

Example: x-obs-server-side-encryption-customer-algorithm:AES256

Constraints:

This header must be used together with x-obs-server-side-encryption-customer-key and x-obs-server-side-encryption-customer-key-MD5.

Range:

AES256: SSE-C encryption and the AES256 algorithm are used.

Default value:

None

x-obs-server-side-encryption-customer-key

Yes only when SSE-C is used. The key must be the same as that used to initiate multipart upload tasks.

String

Definition:

Indicates the key used to encrypt the target part when SSE-C is used.

Example: x-obs-server-side-encryption-customer-key:K7QkYpBkM5+hca27fsNkUnNVaobncnLht/rCB2o/9Cw=

Constraints:

This header is a Base64-encoded 256-bit key and must be used together with x-obs-server-side-encryption-customer-algorithm and x-obs-server-side-encryption-customer-key-MD5.

Range:

None

Default value:

None

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

Yes only when SSE-C is used. The MD5 value must be the same as that used to initiate multipart upload tasks.

String

Definition:

Indicates the MD5 value of the key for encrypting the part when SSE-C is used. The MD5 value is used to ensure data integrity during key transmission.

Example: x-obs-server-side-encryption-customer-key-MD5:4XvB3tbNTN+tIEVa0/fGaQ==

Constraints:

This header is a Base64-encoded 128-bit MD5 value and must be used together with x-obs-server-side-encryption-customer-algorithm and x-obs-server-side-encryption-customer-key.

Range:

MD5 value of the key.

Default value:

None

x-obs-copy-source-server-side-encryption-customer-algorithm

Yes only when SSE-C is used to copy a source object

String

Definition:

Indicates the encryption algorithm for the source object when SSE-C is used.

Example: x-obs-copy-source-server-side-encryption-customer-algorithm:AES256

Constraints:

This header must be used together with x-obs-copy-source-server-side-encryption-customer-key and x-obs-copy-source-server-side-encryption-customer-key-MD5.

Range:

AES256: SSE-C encryption and the AES256 algorithm are used.

Default value:

None

x-obs-copy-source-server-side-encryption-customer-key

Yes only when SSE-C is used to copy a source object

String

Definition:

Indicates the key for decrypting the source object when SSE-C is used.

Example: x-obs-copy-source-server-side-encryption-customer-key:K7QkYpBkM5+hca27fsNkUnNVaobncnLht/rCB2o/9Cw=

Constraints:

This header is a Base64-encoded 256-bit key and must be used together with x-obs-copy-source-server-side-encryption-customer-algorithm and x-obs-copy-source-server-side-encryption-customer-key-MD5.

Range:

None

Default value:

None

x-obs-copy-source-server-side-encryption-customer-key-MD5

Yes only when SSE-C is used to copy a source object

String

Definition:

Indicates the MD5 value of the key for the source object when SSE-C is used. The MD5 value is used to ensure data integrity during key transmission.

Example: x-obs-copy-source-server-side-encryption-customer-key-MD5:4XvB3tbNTN+tIEVa0/fGaQ==

Constraints:

This header is a Base64-encoded 128-bit MD5 value and must be used together with x-obs-copy-source-server-side-encryption-customer-algorithm and x-obs-copy-source-server-side-encryption-customer-key.

Range:

MD5 value of the key.

Default value:

None

x-obs-copy-source-if-match

No

String

Definition:

Indicates that the source object is copied only if its ETag matches the one specified in this header. Otherwise, a 412 status code (failed precondition) is returned.

Example: x-obs-copy-source-if-match: etag

Constraints:

This parameter can be used with x-obs-copy-source-if-unmodified-since but cannot with other conditional copy headers.

Range:

The ETag of the source object

Default value:

None

x-obs-copy-source-if-none-match

No

String

Definition:

Indicates that the source object is copied only if its ETag does not match the one specified in this header. Otherwise, a 412 status code (failed precondition) is returned.

Example: x-obs-copy-source-if-none-match: etag

Constraints:

This parameter can be used with x-obs-copy-source-if-modified-since but cannot with other conditional copy headers.

Range:

None

Default value:

None

x-obs-copy-source-if-unmodified-since

No

String

Definition:

Objects are copied only if the source object has not been modified after the time specified by this parameter. Otherwise, error code 412 (the precondition is not met) is returned.

Constraints:

  • This parameter can be used with x-obs-copy-source-if-match but cannot with other conditional copy parameters.
  • The time specified by this parameter cannot be later than the current server time (GMT time), or this parameter does not take effect.

Range:

The value is an HTTP time character string in the format specified by RFC2616. Select one of the following formats:

  1. EEE, dd MMM yyyy HH:mm:ss z
  2. EEEE, dd-MMM-yy HH:mm:ss z
  3. EEE MMM dd HH:mm:ss yyyy

Examples:

  1. x-obs-copy-source-if-unmodified-since: Sun, 06 Nov 1994 08:49:37 GMT
  2. x-obs-copy-source-if-unmodified-since: Sunday, 06-Nov-94 08:49:37 GMT
  3. x-obs-copy-source-if-unmodified-since: Sun Nov 6 08:49:37 1994

Default value:

None

x-obs-copy-source-if-modified-since

No

String

Definition:

Objects are copied only if the source object has been modified after the time specified by this parameter. Otherwise, error code 412 (the precondition is not met) is returned.

Constraints:

  • This parameter can be used with x-obs-copy-source-if-none-match but cannot with other conditional copy parameters.
  • The time specified by this parameter cannot be later than the current server time (GMT time), or this parameter does not take effect.

Range:

The value is an HTTP time character string in the format specified by RFC2616. Select one of the following formats:

  1. EEE, dd MMM yyyy HH:mm:ss z
  2. EEEE, dd-MMM-yy HH:mm:ss z
  3. EEE MMM dd HH:mm:ss yyyy

Examples:

  1. x-obs-copy-source-if-unmodified-since: Sun, 06 Nov 1994 08:49:37 GMT
  2. x-obs-copy-source-if-unmodified-since: Sunday, 06-Nov-94 08:49:37 GMT
  3. x-obs-copy-source-if-unmodified-since: Sun Nov 6 08:49:37 1994

Default value:

None

Request Elements

This request involves no elements.

Response Syntax

HTTP/1.1 status_code
Date: date

<?xml version="1.0" encoding="UTF-8" standalone="yes"?> 
<CopyPartResult xmlns="http://obs.region.myhuaweicloud.com/doc/2015-06-30/">
> 
    <LastModified>modifiedDate</LastModified>  
    <ETag>etag</ETag> 
</CopyPartResult>

Response Headers

The response to the request uses common headers. For details, see Table 1.

Table 3 Additional response headers

Parameter

Type

Description

x-obs-server-side-encryption

String

Definition:

This parameter specifies the encryption mode for the part copy.

Example: x-obs-server-side-encryption:kms

Range:

  • kms: SSE-KMS is used.
  • AES256: SSE-OBS is used and the AES256 algorithm is used.

x-obs-server-side-encryption-kms-key-id

String

Definition:

If the SSE-KMS encryption is used with a specified key, the key ID is required. For details about how to obtain the key ID, see Viewing a Key. This header can be used to specify the encryption key only when the x-obs-server-side-encryption header is set to kms (that is, the KMS encryption is used).

Range:

If you choose to use KMS for encryption but do not set this header, the value of this header is the ID of the default key. If you want to use a custom key, obtain the key ID by referring to Viewing Key Details.

x-obs-server-side-encryption-customer-algorithm

String

Definition:

Indicates an encryption algorithm. This header is included in a response if SSE-C is used.

Example: x-obs-server-side-encryption-customer-algorithm:AES256

Range:

AES256: SSE-C encryption and the AES256 algorithm are used.

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

String

Definition:

Indicates the MD5 value of the key for encrypting objects. This header is included in a response when SSE-C is used.

Example: x-obs-server-side-encryption-customer-key-MD5:4XvB3tbNTN+tIEVa0/fGaQ==

Range:

MD5 value of the key.

Response Elements

This response contains elements of a part copy result. Table 4 describes the elements.

Table 4 Response elements

Parameter

Type

Description

LastModified

String

Definition:

Indicates the latest time an object was modified. The time is in the ISO8601 format.

Example: 2018-01-01T00:00:00.000Z

Range:

None

ETag

String

Definition:

ETag value of the target part. It is the unique identifier of the part content and is used to verify data integrity when assembling parts.

Range:

The value must contain 32 characters.

Error Responses

  1. If the AK or signature is invalid, OBS returns 403 Forbidden and the error code is AccessDenied.
  2. Check whether the source bucket or destination bucket exists. If the source bucket or destination bucket does not exist, OBS returns 404 Not Found and the error code is NoSuchBucket.
  3. If the source object does not exist, OBS returns 404 Not Found and the error code is NoSuchKey.
  4. If the user does not have the read permission for the specified object, OBS returns 403 Forbidden and the error code is AccessDenied.
  5. If the user does not have the write permission for the destination bucket, OBS returns 403 Forbidden and the error code is AccessDenied.
  6. If the specified task does not exist, OBS returns 404 Not Found and the error code is NoSuchUpload.
  7. If the user is not the initiator of the multipart upload task, OBS returns 403 Forbidden and the error code is AccessDenied.
  8. When the size of a copied part has exceeded 5 GB, OBS returns 400 Bad Request.
  9. If a part number is not within the range from 1 to 10000, OBS returns error code 400 Bad Request.

Other errors are included in Table 2.

Sample Request

PUT /tobject02?partNumber=2&uploadId=00000163D40171ED8DF4050919BD02B8 HTTP/1.1
User-Agent: curl/7.29.0
Host: examplebucket.obs.region.myhuaweicloud.com
Accept: */*
Date: WED, 01 Jul 2015 05:16:32 GMT
Authorization: OBS H4IPJX0TQTHTHEBQQCEC:dSnpnNpawDSsLg/xXxaqFzrAmMw=
x-obs-copy-source: /destbucket/object01

Sample Response

 1
 2
 3
 4
 5
 6
 7
 8
 9
10
11
12
13
HTTP/1.1 200 OK
Server: OBS
x-obs-request-id: 8DF400000163D40ABBD20405D30B0542
x-obs-id-2: 32AAAQAAEAABAAAQAAEAABAAAQAAEAABCTIJpD2efLy5o8sTTComwBb2He0j11Ne
Content-Type: application/xml
Date: WED, 01 Jul 2015 05:16:32 GMT
Transfer-Encoding: chunked

<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<CopyPartResult xmlns="http://obs.ap-southeast-1.myhuaweicloud.com/doc/2015-06-30/">
  <LastModified>2015-07-01T05:16:32.344Z</LastModified>
  <ETag>"3b46eaf02d3b6b1206078bb86a7b7013"</ETag>
</CopyPartResult>

Sample Request: Specifying versionId to Copy a Part

PUT /tobject02?partNumber=2&uploadId=00000163D40171ED8DF4050919BD02B8 HTTP/1.1
User-Agent: curl/7.29.0
Host: examplebucket.obs.region.myhuaweicloud.com
Accept: */*
Date: WED, 01 Jul 2015 05:16:32 GMT
Authorization: OBS H4IPJX0TQTHTHEBQQCEC:dSnpnNpawDSsLg/xXxaqFzrAmMw=
x-obs-copy-source: /examplebucket/object01?versionId=G001118A6456208AFFFFD24829FCF614

Sample Response: Specifying versionId to Copy a Part

HTTP/1.1 200 OK
Server: OBS
x-obs-request-id: 8DF400000163D40ABBD20405D30B0542
x-obs-id-2: 32AAAQAAEAABAAAQAAEAABAAAQAAEAABCTIJpD2efLy5o8sTTComwBb2He0j11NeContent-Type: application/xml
Date: WED, 01 Jul 2015 05:16:32 GMT
Transfer-Encoding: chunked
 
<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<CopyPartResult xmlns="http://obs.ap-southeast-1.myhuaweicloud.com/doc/2015-06-30/">
  <LastModified>2015-07-01T05:16:32.344Z</LastModified>
  <ETag>"3b46eaf02d3b6b1206078bb86a7b7013"</ETag>
</CopyPartResult>