S3 · Multipart uploads

CreateMultipartUpload

POST/{bucket}/{key}?uploads

Starts a multipart upload and returns its upload ID.

A multipart upload writes a large object in parts. Start it here, send each part with UploadPart, then join the parts with CompleteMultipartUpload.

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Role: Editor or higher
Support: Supported
Auth: SigV4 with your API key

Starts an upload. aws s3 cp uses multipart for large files.
Storage keeps only Content-Type from this request. The object gets no metadata, tags, or other stored headers.

Request

https://wspq7ws2np5l8z4.storage.beta.graphon.sh/support-tickets/big.bin?uploads

POST /support-tickets/big.bin?uploads HTTP/1.1
Host: wspq7ws2np5l8z4.storage.beta.graphon.sh
x-amz-date: 20261007T093000Z
x-amz-content-sha256: e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855
Authorization: AWS4-HMAC-SHA256 Credential=<ACCESS_KEY_ID>/20261007/us-east-1/s3/aws4_request, SignedHeaders=host;x-amz-content-sha256;x-amz-date, Signature=<SIGNATURE>

Replace wspq7ws2np5l8z4 with your workspace ID. HTTP shows the signed request on the wire. The aws CLI and the SDKs sign for you. The CLI uses the graphon profile, and the SDK samples read GRAPHON_API_KEY.

Response

200

The upload started.

HTTP/1.1 200 OK
Content-Type: application/xml
x-amz-request-id: 4F8A2C7D1E6B4093A5C2D8E1F7B3A960

<?xml version="1.0" encoding="UTF-8"?>
<InitiateMultipartUploadResult xmlns="http://s3.amazonaws.com/doc/2006-03-01/">
  <Bucket>support-tickets</Bucket>
  <Key>big.bin</Key>
  <UploadId>VXBsb2FkIGZvciBiaWcuYmlu</UploadId>
</InitiateMultipartUploadResult>

Path parameters

bucketstringrequired

The bucket name.

keystringrequired

The object key. Keep each / as it is. Percent-encode the other reserved characters.

Query parameters

uploadsflagrequired

Selects this operation. Send it with no value.

Headers

Content-Typestringoptional

The media type of the object.

Default: "application/octet-stream"

x-amz-expected-bucket-ownerstringoptional

The workspace ID that must own the bucket. Another owner returns 403 AccessDenied.

Responses

200OK

The upload started.

application/xml

InitiateMultipartUploadResultobjectrequired

The root element.

Bucketstring

The bucket name.

Keystring

The object key.

UploadIdstring

The ID that the other multipart calls take.

Errors

Select an error in the response example to see its XML body. Any request can also get the common errors, such as SignatureDoesNotMatch.

404NoSuchBucket

No bucket has this name, or the bucket was deleted.

What to do: Check the bucket name. ListBuckets shows the buckets of the workspace.

403AccessDenied

The key does not have the role for this operation, or the bucket is in another workspace.

What to do: Use a key of the workspace that owns the bucket, with the role above.

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