def temp_upload_url(object_key, temp_url_key, expires_at = Time.now.to_i + 60)
      private_url("PUT", object_key, temp_url_key, expires_at)
    end
def temp_upload_url(object_key, temp_url_key, expires_at = Time.now.to_i + 60)
      private_url("PUT", object_key, temp_url_key, expires_at)
    end
Generate a temporary URL for uploading a file to a private container. Anyone
 can perform a PUT request to the URL returned from this method and an object
 will be created in the container.