No, I'm not saying that. I want the server  to execute ftp  actions
that are independent of any visitor/client. For instance, I want to
send a file on the web server to an ftp server(s) using a web
interface.

But something like you mentioned could be useful when a visitor has
no FTP capabilities or FTP ports are blocked, etc..Have the web
server fetch files and make them available via http download.