in reply to daniel:// stenberg://

I've prototyped a CLI client for resumable uploads at github.com/tus/rufh-implementa… and the gist is: The client offers the server to upgrade to resumable uploads. If the server provides an upload resource, the client can use it to resume from network interruptions and 5XX responses. In addition, the upload resource URI is saved in a text file, allowing resumption after the client crashes or is interrupted (e.g. Ctrl/Cmd+C), similar to how curl's `--continue-at -` works.