RFC691 - One more try on the FTP

• use the first digit to decide whether or not to retry. This
  scheme does not cause any catastrophes if some server is slow
  in converting; it merely leads to unnecessary retries. A few
  CPU cycles would be wasted in the month following the official
  switch. Thus, this feature is very different from (a) and
  (b), which could lead to catastrophic failures if not
  implemented all at once. (Yes, I know that FTP-2 is supposed
  to be done on a different ICP socket. I am not discussing
  FTP-2 but whether its virtues can be transferred to FTP-1.)
  The specific codes involved are listed below. 6g4

  d. The use of the second digit to indicate the type of
  message. (The proposed division is not totally clean;
  for example, why is 150 ("file status okay; about to open
  data connection") considered to be more about the file
  system than about the data connection?) This can easily
  be done, since the second digit is not currently important
  to any user process--the TENEX mailer is, in this plan,
  already due for modification because of (c). Since this
  is mostly an aesthetic point, I'm hesitant to do it if it
  would be difficult for anyone. In particular, I would want to
  leave the 25x messages alone, in case some user programs
  distinguish these. This is especially likely for the ones
  which are entirely meant for the program: 251 and 255.
  Therefore I propose that if this idea is adopted in FTP-1
  the meanings of x2x and x5x be interchanged. This proposal is
  reflected in the specific list below. 6g5

  Let me summarize the specific changes to FTP-1 I'd like to see made,
  most of which are merely documentation changes to reflect reality: 7

  1. HELP should return 200. All commands should return 2xx if
  successful, and I believe all do except HELP. 7a

  2. The definition of 1xx messages should be changed to read:
  

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