A HEAD request is used to determine the offset at which the upload should be continued.
The Server MUST always include the Upload-Offset header in the response for a HEAD request,
even if the offset is 0, or the upload is already considered completed. If the size of the upload is known,
the Server MUST include the Upload-Length header in the response.
The Server MUST prevent the client and/or proxies from caching the response by adding
the Cache-Control: no-store header to the response.