Upload Part

Use the Upload Part operation to upload each part of an object being saved to storage via a multipart upload. Before you using this operation, an Initiate Multipart Upload request must be issued for the object, as the upload ID returned by that operation is required for the Upload Part operation. Along with the upload ID, a part number must also be specified with each Upload Part operation.

Part numbers can be any number from 1 to 10,000, inclusive. A part number uniquely identifies a part and also defines its position within the object being created. If a new part is uploaded using the same part number that was used with a previous part, the previously uploaded part is overwritten.

The largest part size permitted is 5 GB which means that the biggest object that can be split is 50 TB (10,000 * 5 GB). Each part must be at least 5 MB in size, except the last part. There is no minimum size threshold on the last part of a multipart upload.

After all the parts are uploaded, a Complete Multipart Upload request must be issued.



PUT /ObjectName?partNumber=PartNumber&uploadId=UploadId HTTP/1.1
Host: {{BucketName}}.{{StorageService}}.com
Date: {{date}}
Content-Length: Size
Authorization: {{authorizationString}}


The Upload Part operation does not use request parameters.


The Upload Part operation can use a number of optional request headers in addition to those that are common to all operations (see Common Request Headers).

Header Type Description
Content-Length integer

The size of the object, in bytes

Default: None

Constraints: None

Content-MD5 string

The base64-encoded 128-bit MD5 digest of the message (without the headers) according to RFC 1864. This header can be used as a message integrity check to verify that the data is the same data that was originally sent. Although it is optional, the use of the Content-MD5 mechanism is recommended as an end-to-end integrity check.

Default: None

Constraints: None

Expect string

When your application uses 100-continue, it does not send the request body until it receives an acknowledgment. If the message is rejected based on the headers, the body of the message is not sent.

Default: None

Valid Values: 100-continue

Constraints: None

Expires string

The date and time at which the object is no longer cacheable.

Default: None

Constraints: None


The Upload Part operation does not return request elements.



The Upload Part operation uses only response headers that are common to all operations (refer to Common Response Headers).


The Upload Part operation does not return response elements.

Special Errors

Error HTTP Status Code Description
NoSuchUpload 404 Not Found Occurs when an invalid upload ID is provided in the Upload Part request, or when a multipart upload has already been either completed or aborted.


PUT Request Uploads a Part in a Multipart Upload


Part 1 of a multipart upload using the upload ID returned by an Initiate Multipart Upload request:

PUT /my-movie.m2ts?partNumber=1&uploadId=VCVsb2FkIElEIGZvciBlbZZpbmcncyBteS1tb3ZpZS5tMnRzIHVwbG9hZR HTTP/1.1
Host: example-bucket.s3.example.com
Date:  Mon, 1 Nov 2010 20:34:56 GMT
Content-Length: 10485760
Content-MD5: pUNXr/BjKK5G2UKvaRRrOA==
Authorization: {{authorizationString}}
***part data omitted***


The response includes the ETag header, a value that is needed for sending the Complete Multipart Upload request.

HTTP/1.1 200 OK
x-amz-id-2: Vvag1LuByRx9e6j5Onimru9pO4ZVKnJ2Qz7/C1NPcfTWAtRPfTaOFg==
x-amz-request-id: 656c76696e6727732072657175657374
Date:  Mon, 1 Nov 2010 20:34:56 GMT
ETag: "b54357faf0632cce46e942fa68356b38"
Content-Length: 0
Connection: keep-alive
Server: ScalityS3