XEP-Remarks/XEP-0363: HTTP File Upload

= Does not use XEP-0131 for headers =

The put element does not re-use "XEP-0131: Stanza Headers and Internet Metadata" as existing building block for headers.

= Unclear service discovery =

Examples show file upload offered on a subdomain, but there should be no reason why it could not be offered on the users bare host JID.

= No retention info =

Users have no way to know, nor influence, how long a file is stored.