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    Documentation

    Complete Multipart Upload

    Last updated: 2020-07-03 17:14:04

      Feature

      This API is used to complete a multipart upload after all parts are uploaded via the Upload Part API. When using this API, you must specify the PartNumber and ETag of each part in the request body to check if the parts are correct.

      It may take minutes for COS to merge uploaded parts upon a completed multipart upload. As a result, when the merging begins, COS immediately returns a 200 status code along with the Transfer-Encoding: chunked response header. COS then periodically returns chunked spaces to keep the connection active until the merging ends, and returns the information about the resulting entire object in the last chunk.

      • If any uploaded part is less than 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.

      We recommend you 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.

      Versioning

      • If versioning is enabled for the bucket, COS will automatically generate a unique version ID for the object to be uploaded and return this ID in the response using the x-cos-version-id response header.
      • If versioning is suspended for the bucket, COS will always use null as the version ID of any object in the bucket, and return the x-cos-version-id: null response header.

      Request

      Request samples

      POST /<ObjectKey>uploadId=UploadId HTTP/1.1
Host: <BucketName-APPID>.cos.<Region>.myqcloud.com
Date: GMT Date
Content-Type: application/xml
Content-Length: Content Length
Content-MD5: MD5
Authorization: Auth String

[Request Body]

      Authorization: Auth String (see Request Signature for more information).

      Request parameters

      Name Description Type Required
      uploadId ID that identifies the multipart upload. It’s the same as the UploadId generated when using the Initiate Multipart Upload API. string Yes

      Request headers

      This API only uses common request headers. For more information, see Common Request Headers.

      Request body

      Submits application/xml request data, including all parts information.

      <CompleteMultipartUpload>
    <Part>
        <PartNumber>integer</PartNumber>
        <ETag>string</ETag>
    </Part>
    <Part>
        <PartNumber>integer</PartNumber>
        <ETag>string</ETag>
    </Part>
</CompleteMultipartUpload>

      The nodes are described in details below:

      Node Name (Keyword) Parent Node Description Type Required
      CompleteMultipartUpload None Contains all information in the Complete Multipart Upload request Container No

      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 The ETag header value returned when the Upload Part request succeeds string Yes

      Response

      Response headers

      In addition to common response headers, this API also returns the following response headers. For more information on common response headers, see Common Response Headers.

      Versioning-related headers

      If the object is uploaded to a versioning-enabled bucket, the following response headers will be returned:

      Name Description Type
      x-cos-version-id Object version ID string

      Headers related to server-side encryption (SSE)

      If you upload an object using SSE encryption, this API will return SSE headers. For more information, see Server-side encryption headers.

      Response body

      Returns application/xml data, including that on the resulting entire object, upon a successful request.

      <?xml version="1.0" encoding="UTF-8"?>
<CompleteMultipartUploadResult xmlns="http://www.qcloud.com/document/product/436/7751">
    <Location>string</Location>
    <Bucket>string</Bucket>
    <Key>string</Key>
    <ETag>string</ETag>
</CompleteMultipartUploadResult>

      The detailed nodes are described as follows:

      Node Name (Keyword) Parent Node Description Type
      CompleteMultipartUploadResult None Contains all the results of the Complete Multipart Upload action Container

      Content of the Container node CompleteMultipartUploadResult:

      Node Name (Keyword) Parent Node Description Type
      Location CompleteMultipartUploadResult Location of the object for which the multipart upload is completed. Format: <BucketName-APPID>.cos.<Region>.myqcloud.com/<ObjectKey>, e.g. examplebucket-1250000000.cos.ap-beijing.myqcloud.com/exampleobject string
      Bucket CompleteMultipartUploadResult The destination bucket for the multipart upload. Format: <BucketName-APPID>, e.g. examplebucket-1250000000 string
      Key CompleteMultipartUploadResult Object key string
      ETag CompleteMultipartUploadResult ETag of the object into which the parts are merged string

      Error codes

      This API uses standardized error responses and error codes. For more information, see Error Codes .

      Examples

      By default, this API uses “Transfer-Encoding: chunked” responses. However, developers should understand that, all the examples below use responses without Transfer-Encoding, which languages and libraries can automatically process. For more information, see the language- and library-specific documentation.

      Example 1. Simple example (versioning not enabled)

      Request

      POST /exampleobject?uploadId=1585130821cbb7df1d11846c073ad648e8f33b087cec2381df437acdc833cf654b9ecc6361 HTTP/1.1
Host: examplebucket-1250000000.cos.ap-beijing.myqcloud.com
Date: Wed, 25 Mar 2020 10:07:26 GMT
Content-Type: application/xml
Content-Length: 353
Content-MD5: Me/0Gvtc2x4VPIOhoIRllw==
Authorization: q-sign-algorithm=sha1&q-ak=AKID8A0fBVtYFrNm02oY1g1JQQF0c3JO****&q-sign-time=1585130846;1585138046&q-key-time=1585130846;1585138046&q-header-list=content-length;content-md5;content-type;date;host&q-url-param-list=uploadid&q-signature=45dae7b1a54930587f8123954664b1b5148b****
Connection: close

<CompleteMultipartUpload>
    <Part>
        <PartNumber>1</PartNumber>
        <ETag>"39270a968a357d24207e9911162507eb"</ETag>
    </Part>
    <Part>
        <PartNumber>2</PartNumber>
        <ETag>"d899fbd1e06109ea2e4550f5751c88d6"</ETag>
    </Part>
    <Part>
        <PartNumber>3</PartNumber>
        <ETag>"762890d6c9a871b7bd136037cb2260cd"</ETag>
    </Part>
</CompleteMultipartUpload>

      Response

      HTTP/1.1 200 OK
Content-Type: application/xml
Content-Length: 378
Connection: close
Date: Wed, 25 Mar 2020 10:07:26 GMT
Server: tencent-cos
x-cos-hash-crc64ecma: 2290339086971918696
x-cos-request-id: NWU3YjJkNWVfZDFjODJhMDlfMTk2ODJfMmEyNTA0****

<?xml version="1.0" encoding="UTF-8"?>
<CompleteMultipartUploadResult xmlns="http://www.qcloud.com/document/product/436/7751">
    <Location>examplebucket-1250000000.cos.ap-beijing.myqcloud.com/exampleobject</Location>
    <Bucket>examplebucket-1250000000</Bucket>
    <Key>exampleobject</Key>
    <ETag>&quot;aa259a62513358f69e98e72e59856d88-3&quot;</ETag>
</CompleteMultipartUploadResult>

      Example 2. Using server-side encryption SSE-COS

      Request

      POST /exampleobject?uploadId=1590862540251355295a5c736513d70d42b92bbde4f0fafb5e0ecb314b55aa0018cc9fa76f HTTP/1.1
Host: examplebucket-1250000000.cos.ap-beijing.myqcloud.com
Date: Sat, 30 May 2020 18:16:08 GMT
Content-Type: application/xml
Content-Length: 153
Content-MD5: wmpyfdr9s/A+VCBwDdC1bA==
Authorization: q-sign-algorithm=sha1&q-ak=AKID8A0fBVtYFrNm02oY1g1JQQF0c3JO****&q-sign-time=1590862568;1590869768&q-key-time=1590862568;1590869768&q-header-list=content-length;content-md5;content-type;date;host&q-url-param-list=uploadid&q-signature=abe1fd2d2c057c8f3e4d331a0448b06ecf5b****
Connection: close

<CompleteMultipartUpload>
    <Part>
        <PartNumber>1</PartNumber>
        <ETag>"108f528eb63b65e734f27ae331f5ffaa"</ETag>
    </Part>
</CompleteMultipartUpload>

      Response

      HTTP/1.1 200 OK
Content-Type: application/xml
Content-Length: 378
Connection: close
Date: Sat, 30 May 2020 18:16:08 GMT
Server: tencent-cos
x-cos-hash-crc64ecma: 4510578591875220731
x-cos-request-id: NWVkMmEyZThfYTJjMjJhMDlfMmQzOV8zYTM5****
x-cos-server-side-encryption: AES256

<?xml version="1.0" encoding="UTF-8"?>
<CompleteMultipartUploadResult xmlns="http://www.qcloud.com/document/product/436/7751">
    <Location>examplebucket-1250000000.cos.ap-beijing.myqcloud.com/exampleobject</Location>
    <Bucket>examplebucket-1250000000</Bucket>
    <Key>exampleobject</Key>
    <ETag>&quot;915fca1c3b2737c262458b3a1a43c683-1&quot;</ETag>
</CompleteMultipartUploadResult>

      Example 3. Using server-side encryption SSE-KMS

      Request

      POST /exampleobject?uploadId=15908625793957d71176fa878282d266a95b79dc2aec159b4a73d1d79c80d4f931cda6ad65 HTTP/1.1
Host: examplebucket-1250000000.cos.ap-beijing.myqcloud.com
Date: Sat, 30 May 2020 18:16:40 GMT
Content-Type: application/xml
Content-Length: 153
Content-MD5: jUFgTSZThmPT3qseea0mRQ==
Authorization: q-sign-algorithm=sha1&q-ak=AKID8A0fBVtYFrNm02oY1g1JQQF0c3JO****&q-sign-time=1590862600;1590869800&q-key-time=1590862600;1590869800&q-header-list=content-length;content-md5;content-type;date;host&q-url-param-list=uploadid&q-signature=68aaf036efac07ef8d6ef101f81a1589849a****
Connection: close

<CompleteMultipartUpload>
    <Part>
        <PartNumber>1</PartNumber>
        <ETag>"1d3e8ae9da423b440341b09f1616f074"</ETag>
    </Part>
</CompleteMultipartUpload>

      Response

      HTTP/1.1 200 OK
Content-Type: application/xml
Content-Length: 378
Connection: close
Date: Sat, 30 May 2020 18:16:40 GMT
Server: tencent-cos
x-cos-hash-crc64ecma: 4510578591875220731
x-cos-request-id: NWVkMmEzMDhfYzhjODJhMDlfMjNhYTBfMjdmNjNl****
x-cos-server-side-encryption: cos/kms
x-cos-server-side-encryption-cos-kms-key-id: 48ba38aa-26c5-11ea-855c-52540085****

<?xml version="1.0" encoding="UTF-8"?>
<CompleteMultipartUploadResult xmlns="http://www.qcloud.com/document/product/436/7751">
    <Location>examplebucket-1250000000.cos.ap-beijing.myqcloud.com/exampleobject</Location>
    <Bucket>examplebucket-1250000000</Bucket>
    <Key>exampleobject</Key>
    <ETag>&quot;8093dc3e18f7070444e6ca21789eb8d4-1&quot;</ETag>
</CompleteMultipartUploadResult>

      Sample 4. Using Server-side Encryption SSE-C

      Request

      POST /exampleobject?uploadId=1590862610acd643927bad05cd3947bf98b56b04b0b0b2a45a49969f87cc95b7fd5fcc065a HTTP/1.1
Host: examplebucket-1250000000.cos.ap-beijing.myqcloud.com
Date: Sat, 30 May 2020 18:17:11 GMT
Content-Type: application/xml
Content-Length: 153
Content-MD5: MnXmb3yvrbwMfBlUwUE1Hg==
Authorization: q-sign-algorithm=sha1&q-ak=AKID8A0fBVtYFrNm02oY1g1JQQF0c3JO****&q-sign-time=1590862631;1590869831&q-key-time=1590862631;1590869831&q-header-list=content-length;content-md5;content-type;date;host&q-url-param-list=uploadid&q-signature=5ce15a35c591eb797e8abaf210313e58ac03****
Connection: close

<CompleteMultipartUpload>
    <Part>
        <PartNumber>1</PartNumber>
        <ETag>"ff14981a35a58eb97bca838b055c573b"</ETag>
    </Part>
</CompleteMultipartUpload>

      Response

      HTTP/1.1 200 OK
Content-Type: application/xml
Content-Length: 378
Connection: close
Date: Sat, 30 May 2020 18:17:11 GMT
Server: tencent-cos
x-cos-hash-crc64ecma: 4510578591875220731
x-cos-request-id: NWVkMmEzMjdfODljOTJhMDlfMzQ2ZDNfMWMwZWYy****
x-cos-server-side-encryption-customer-algorithm: AES256
x-cos-server-side-encryption-customer-key-MD5: U5L61r7jcwdNvT7frmUG8g==

<?xml version="1.0" encoding="UTF-8"?>
<CompleteMultipartUploadResult xmlns="http://www.qcloud.com/document/product/436/7751">
    <Location>examplebucket-1250000000.cos.ap-beijing.myqcloud.com/exampleobject</Location>
    <Bucket>examplebucket-1250000000</Bucket>
    <Key>exampleobject</Key>
    <ETag>&quot;55973f71e8e892273053617e6b83d1c7-1&quot;</ETag>
</CompleteMultipartUploadResult>

      Example 5. Enabling versioning

      Request

      POST /exampleobject?uploadId=15908626631e1995018f81a5e563837d6d7f1b51d7c97dff09989296403e32366e52f2877b HTTP/1.1
Host: examplebucket-1250000000.cos.ap-beijing.myqcloud.com
Date: Sat, 30 May 2020 18:18:04 GMT
Content-Type: application/xml
Content-Length: 153
Content-MD5: wmpyfdr9s/A+VCBwDdC1bA==
Authorization: q-sign-algorithm=sha1&q-ak=AKID8A0fBVtYFrNm02oY1g1JQQF0c3JO****&q-sign-time=1590862684;1590869884&q-key-time=1590862684;1590869884&q-header-list=content-length;content-md5;content-type;date;host&q-url-param-list=uploadid&q-signature=5409509944602014d1b61cb4bbe1e39003b4****
Connection: close

<CompleteMultipartUpload>
    <Part>
        <PartNumber>1</PartNumber>
        <ETag>"108f528eb63b65e734f27ae331f5ffaa"</ETag>
    </Part>
</CompleteMultipartUpload>

      Response

      HTTP/1.1 200 OK
Content-Type: application/xml
Content-Length: 378
Connection: close
Date: Sat, 30 May 2020 18:18:04 GMT
Server: tencent-cos
x-cos-hash-crc64ecma: 4510578591875220731
x-cos-request-id: NWVkMmEzNWNfOGNjOTJhMDlfMWQ4NjJfMWM0NGUw****
x-cos-version-id: MTg0NDUxNTMyMTEwNDU1NDc3OTc

<?xml version="1.0" encoding="UTF-8"?>
<CompleteMultipartUploadResult xmlns="http://www.qcloud.com/document/product/436/7751">
    <Location>examplebucket-1250000000.cos.ap-beijing.myqcloud.com/exampleobject</Location>
    <Bucket>examplebucket-1250000000</Bucket>
    <Key>exampleobject</Key>
    <ETag>&quot;42318fc0ec58952b0d9ab4d7a006f595-1&quot;</ETag>
</CompleteMultipartUploadResult>

      Example 6. Suspending versioning

      Request

      POST /exampleobject?uploadId=1590862705b4349d597c0db1281e1c666bc431eb468b3a64076be7093c91a963bc5ead2ea4 HTTP/1.1
Host: examplebucket-1250000000.cos.ap-beijing.myqcloud.com
Date: Sat, 30 May 2020 18:18:45 GMT
Content-Type: application/xml
Content-Length: 153
Content-MD5: wmpyfdr9s/A+VCBwDdC1bA==
Authorization: q-sign-algorithm=sha1&q-ak=AKID8A0fBVtYFrNm02oY1g1JQQF0c3JO****&q-sign-time=1590862725;1590869925&q-key-time=1590862725;1590869925&q-header-list=content-length;content-md5;content-type;date;host&q-url-param-list=uploadid&q-signature=b212e42daaeabcd2b8e9f6722b62fe8d618b****
Connection: close

<CompleteMultipartUpload>
    <Part>
        <PartNumber>1</PartNumber>
        <ETag>"108f528eb63b65e734f27ae331f5ffaa"</ETag>
    </Part>
</CompleteMultipartUpload>

      Response

      HTTP/1.1 200 OK
Content-Type: application/xml
Content-Length: 378
Connection: close
Date: Sat, 30 May 2020 18:18:45 GMT
Server: tencent-cos
x-cos-hash-crc64ecma: 4510578591875220731
x-cos-request-id: NWVkMmEzODVfZjZjMjBiMDlfNGYzZV8zODc4****
x-cos-version-id: null

<?xml version="1.0" encoding="UTF-8"?>
<CompleteMultipartUploadResult xmlns="http://www.qcloud.com/document/product/436/7751">
    <Location>examplebucket-1250000000.cos.ap-beijing.myqcloud.com/exampleobject</Location>
    <Bucket>examplebucket-1250000000</Bucket>
    <Key>exampleobject</Key>
    <ETag>&quot;491509b1fdf8e13d1f51d323c4a6d0e8-1&quot;</ETag>
</CompleteMultipartUploadResult>

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