Export REST API with URL option responds accepted even though upload failed

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Steps to reproduce:

Send a POST request to https://www.gitlab.com/api/v4/projects/:id/export with access token as a query parameter. The body contains two lines:

upload[http_method]=PUT
upload[url]={presigned_aws_url_to_upload_to_s3_bucket}

As an example

It responds with 202 accepted even though the presigned URL is invalid.

For a valid URL it responds the same way but however doesn't upload.

When checking the

For reference:

Import/Export documentation