[auscompgeek]

Because these protocols are unusable from the perspective of JS on a webpage in a browser. Yes, browsers do support FTP, but I don't believe there are any browsers that support FTP uploads (and even if there are any, I doubt it'd be possible to upload from JS).

HTTP also has the advantage of being allowed through virtually every firewall.

It seems that webapps are paving the way of the future, for better or worse.