FTP clients and servers on Windows and Unix-like platforms only implement STREAM mode BLOCK (and more rarely COMPRESSED) mode is used to transfer record-oriented files on mainframe and minicomputer systems. The term "mode" strictly speaking refers to the three transfer MODEs – STREAM (S), BLOCK (B) and COMPRESSED (C). "ASCII mode" is a misnomer, albeit a very common one – the FTP protocol standard actually speaks of TYPEs – ASCII (A), EBCDIC (E), IMAGE (I), and LOCAL BYTE (L n). The "ASCII mode" of which you speak is one of those there are quite a few more, most of which are rarely implemented. FTP has lots of features which made sense in the environment in which it originally developed, but which make far less sense today. ![]() Nowadays it is dominated by Windows and various Unix-like systems (Linux, Android, macOS, iOS, etc) back then there were a great many mainframe and minicomputer systems, many of which did things – even quite basic things like how files were stored – very differently from how Windows and Unix-like systems do things – mainframes and minicomputers are still around on the Internet, but they've gone from being a significant minority, maybe even at some points a majority, to being a minuscule one. The Internet was a very different place back then. The current version, RFC959, dates back to 1985 earlier versions were defined by RFC765 in 1980, and RFC114 all the way back in 1971. You have to understand that FTP is a very old protocol.
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