Help & DocumentationCloud Object StorageAPI DocumentationObject APIsMultipart UploadComplete Multipart Upload

Complete Multipart Upload

Last updated: 2019-12-16 18:01:38

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Description

This API is used to complete a multipart upload. After all parts are uploaded via the Upload Part API, you need to call this API to complete the multipart upload. When using this API, you need to specify the PartNumber and ETag of each part in the request body for the part information to be verified.
As the parts need to be merged after they are uploaded, and the merge takes several minutes, COS will immediately return status code 200 when the merge starts, and periodically return spaces during the merge to keep the connection active until the merge is complete. After that, COS will return the content of the merged object in the response body.

  • If any uploaded part is below 1 MB in size, 400 EntityTooSmall will be returned when this API is called.
  • If the numbers of the uploaded parts are not continuous, 400 InvalidPart will be returned when this API is called.
  • If the part information entries in the request body are not sorted by number in ascending order, 400 InvalidPartOrder will be returned when this API is called.
  • If the uploadId does not exist, 404 NoSuchUpload will be returned when this API is called.

Note：
It is recommended to either complete or abort a multipart upload as early as possible, as the uploaded parts of an incomplete multipart upload will take up storage capacity and incur storage fees.

Version

If versioning is enabled, the GET operation will return the current version of the object. To obtain a different version, please use the versionId parameter.

Request

Syntax example:

POST /ObjectName?uploadId=UploadId HTTP/1.1
Host: <BucketName-APPID>.cos.<Region>.myqcloud.com
Date: GMT Date
Content-length: Size
Authorization: Auth String

Authorization: Auth String (see Request Signature for details).

Request Line

POST /ObjectName?uploadId=UploadId HTTP/1.1

This API allows POST requests.

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Request Parameters

See the details below:

Parameter Name Description Type Required
uploadId ID of this multipart upload.
When the Initiate Multipart Upload API is used to initialize a multipart upload, an uploadId will be returned. The ID uniquely identifies the data of the part and its position in the entire file		 String Yes

Request Headers

Common Headers

The implementation of this operation uses common request headers. For more information on common request headers, see Common Request Headers.

Special Headers

This request operation does not use any special request header.

Request Body

The node content of this request body is:

<CompleteMultipartUpload>
  <Part>
    <PartNumber></PartNumber>
    <ETag></ETag>
  </Part>
  ...
</CompleteMultipartUpload>

The data are described in details below:

Node Name (Keyword) Parent Node Description Type Required
CompleteMultipartUpload None Describes all information on this multipart upload Container Yes

Content of the Container node CompleteMultipartUpload:

Node Name (Keyword) Parent Node Description Type Required
Part CompleteMultipartUpload Describes information on each part in this multipart upload Container Yes

Content of the Container node Part:

Node Name (Keyword) Parent Node Description Type Required
PartNumber CompleteMultipartUpload.Part Part number Integer Yes
ETag CompleteMultipartUpload.Part MD5 checksum of each part String Yes
## Response

Response Headers

Common Response Headers

This response uses common response headers. For more information on common response headers, see Common Response Headers.

Special Response Headers

Name Description Type
x-cos-server-side-encryption Specifies how the server-side encryption is enabled for the object.
For encryption with a COS master key, pass in AES256		 String
x-cos-version-id Version ID of the new object if versioning is enabled for the bucket String

Response Body

This response body returns application/xml data. The following contains all the node data:

<CompleteMultipartUploadResult>
  <Location></Location>
  <Bucket></Bucket>
  <Key></Key>
  <ETag></ETag>
</CompleteMultipartUploadResult>

The data are described in details below:

Node Name (Keyword) Parent Node Description Type
CompleteMultipartUploadResult None Describes all the returned information Container

Content of the Container node CompleteMultipartUploadResult:

Node Name (Keyword) Parent Node Description Type
Location CompleteMultipartUploadResult Public network domain name used to access the new object URL
Bucket CompleteMultipartUploadResult Destination bucket for the multipart upload, which is formed by connecting a user-defined string and the system-generated appid with a hyphen, such as mybucket-1250000000 String
Key CompleteMultipartUploadResult Object name String
ETag CompleteMultipartUploadResult The unique tag value of the merged object, which is not the MD5 checksum of the object's content and can only be used to check the object's uniqueness. String

Example

Request

POST /ObjectName?uploadId=1484728886e63106e87d8207536ae8521c89c42a436fe23bb58854a7bb5e87b7d77d4ddc48 HTTP/1.1
Host: arlenhuangtestsgnoversion-1251668577.cos.ap-beijing.myqcloud.com
Date: Wed，18 Jan 2017 16:17:03 GMT
Authorization: q-sign-algorithm=sha1&q-ak=AKIDWtTCBYjM5OwLB9CAwA1Qb2ThTSUjfGFO&q-sign-time=1484729794;32557625794&q-key-time=1484729794;32557625794&q-header-list=host&q-url-param-list=uploadId&q-signature=23627c8fddb3823cce4257b33c663fd83f9f820d
Content-Length: 138

<CompleteMultipartUpload><Part><PartNumber>1</PartNumber><ETag>"fc392a65890e447ff4e2d256489a9773"</ETag></Part></CompleteMultipartUpload>

Response

HTTP/1.1 200 OK
Content-Type: application/xml
Content-Length: 277
Connection: keep-alive
Date: Wed，18 Jan 2017 16:17:03 GMT
Server: tencent-cos
x-cos-request-id: NTg3ZjJlMjVfNDYyMDRlXzM0YzRfMjc1

<CompleteMultipartUploadResult>
    <Location>arlenhuangtestsgnoversion-1251668577.cos.ap-beijing.myqcloud.com/ObjectName</Location>
    <Bucket>arlenhuangtestsgnoversion-1251668577</Bucket>
    <Key>ObjectName</Key>
    <ETag>"3a0f1fd698c235af9cf098cb74aa25bc"</ETag>
</CompleteMultipartUploadResult>