Implementing ftp using Javascript

Question

I dont understand why cant javascript make ftp calls?. Why do we have to make such a request using server?

Even Browsers have ability to authenticate and browse a ft

Answer 1

its very difficult to FTP data(BIGfile) to backup server without using HTTP protocol in a web application.

Lets say, S1-( Client Browser ), S2-(code container server), S3-(Files Backup server) and we want to upload 2gb file from s1 using FTP.

use case diagram

This can be done by "JavaApplet" . we can embed uploader applet in webapplication. This applet will run inside browser sand box.
go through link

sample code for ftp using applet

provided you have to enable java on your browser.