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e5974ac4b0
Before this change rclone used presigned requests to upload single part objects. This was because of a limitation in the SDK which didn't allow non seekable io.Readers to be passed in. This is incompatible with some S3 backends, and rclone wasn't adding the `X-Amz-Content-Sha256: UNSIGNED-PAYLOAD` header which was incompatible with other S3 backends. The SDK now allows for this so rclone can use PutObject directly. This sets the `X-Amz-Content-Sha256: UNSIGNED-PAYLOAD` flag on the PUT request. However rclone will add a `Content-Md5` header if at all possible so the body data is still protected. Note that the old behaviour can still be configured if required with the `use_presigned_request` config parameter. Fixes #5422