Uploading to S3 bucket in eu-central-1 doesn't work

> **06b3807** created the issue

When trying to upload a file to a S3 bucket in eu-central-1 region, the following error occurs:

Header "x-amz-content-sha256" set to the hex-encoded SHA256 hash of the request payload is required for AWS Version 4 request signing, please set this on: PUT https://[a-bucket-name].s3-eu-central-1.amazonaws.com:443/[a-filename] HTTP/1.1.
