[im3w1l]

We need a protocol for file transfers because having a protocol makes it more standardized and interoperable than if everyone rolls their own solution.

Do we need browser support for it? It still happens now and then that a link will have an ftp target. That could be handled in the browser or it could open a separate url-handling application, as e.g. email or magnet urls do.

[anyfoo]

Yes, but as someone who's been around when FTP was a big thing, and HTTP only just came into fruition... what, really, is the benefit of FTP? In fact, FTP is actually a horrible protocol, that caused me much pain even back then:

It uses separate "command" and "data" channels. The data channel is usually in the other direction, i.e. the client listens to a connection from the server when downloading a file. Passive mode, and an extra command for that, had to be implemented, and if the stars don't align right, it still ends up being a pain.

FTP also used to default to 7bit. If you did not explicitly switch to 8bit mode, you got corrupted downloads. This maybe made sense in a world with fundamentally different encodings, line endings, and where connection speeds were slow enough that downloading text files was a big task, but now?

Then, if I remember correctly, the file listing you got was not actually standardized, it could just be the output of the "ls" command on the server! FTP clients used to be dumb and just passed that output through to you, so it did not matter much. For smarter clients later, it did start to matter.

Finally, what does FTP actually offer that, in most cases, HTTP, and, in niche cases, rsync, scp or sftp do not offer?

[viraptor]

> It uses separate "command" and "data" channels

This is not a bad thing in itself. It could enable you to download each file from a different, potentially better endpoint, while talking to the same server for coordination. It's just not the way we do it these days anymore - 3xx and anycast/CDNs solve that one to some extent. And NATs destroyed that idea being usable years ago. It's still fine in protocols like sip.

[anyfoo]

Yes. Just like the text conversion thing, or the non-standardizes file listing thing (not everything was UNIX-ish, VMS was still around), at the time it made sense. Today it's just clunky hindrances, and the protocol has lost its benefits.

[ZWoz]

I would argue, that separate control/data channels makes protocol more secure. You can't sneak commands on data and you don't need worry, how do terminate data transmission and switch back to control mode.