create_multipart_upload does not publish content-length

[allada]

Describe the bug

Some S3 API providers require the content-length header to be published when using the S3 API and create_multipart_upload(). Specifically GCP is an example of this, therefore it is not possible to use aws-sdk-rust with GCP.

Expected Behavior

create_multipart_upload() should send a content-length header.

Current Behavior

content-length header is not published.

Reproduction Steps

Try to use the create_multipart_upload() with GCP's API.

Possible Solution

No response

Additional Information/Context

Possible more context: TraceMachina/nativelink#491

Version

aws-sdk-s3 = "0.35.0"

Environment details (OS name and version, etc.)

N/A

Logs

No response

[jdisanti]

Do they require content-length on CreateMultipartUpload, or on UploadPart? The UploadPart operation has a content_length field you can set if it's the latter.

If it's needed for CreateMultipartUpload, you can call .customize().mutate_request(), which will allow you to add a header to the HTTP request before it is sent. Content-length isn't modeled for CreateMultipartUpload, so it's not something we would ever add there unless S3 modeled it.