} else if kind != crypto.S3 {
			// if we have a replication request
			// and SSE-S3 is specified do not preserve
			// the incoming etag.
			userDefined["etag"] = opts.PreserveETag
		}
	}

	// Guess content-type from the extension if possible.
	if userDefined["content-type"] == "" {
		userDefined["content-type"] = mimedb.TypeByExtension(path.Ext(object))
	}