Downloading a file from a remote server?

I am using the Paperclip plugin to store video attachments into a
remote server (via an ftp storage module written by Damian Caruso) it
works well…
Now I would like my web app user to be able to download back this
attachment into their local pc

I can use

def download

Net::SCP.start( hostname, username, :password => password ) do|
CraigStadler.mp4’, ‘/tmp’)
… which download the file first in the /tmp folder of my web app,
then doing a sendfile…

but is there any other solution ( direct link to remote server is not
a solution… )

thanks for your help