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Date: Mon, 14 Feb 2000 21:10:17 +0900 (JST)
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To: FreeBSD-net-jp@jp.freebsd.org
From: Shigeji Ishikawa <shigeji@sdd3.mt.nec.co.jp>
In-Reply-To: Your message of "Mon, 14 Feb 2000 14:38:36 +0900"
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Subject: [FreeBSD-net-jp 2247] Re: FTP vs HTTP
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  $B@P@n(B@NEC $B$G$9(B.

=-=-= Akihiro IIJIMA <aki@jp.freebsd.org> $B$5$s$N(B
      [FreeBSD-net-jp 2234] FTP vs HTTP $B$h$j(B =-=-=

> $B$J$K$+(B FTP$B$K$7$+$J$$(B $B%9%Z%7%c%k$J5!G=$,$"$k$N$G$7$g$&$+!)(B

  FTP $B$K$7$+$J$$$H;W$o$l$k%9%Z%7%c%k$J5!G=$G$"$l$P!"(B
  RFC959 $B$K=q$+$l$F$$$k(B

|      In another situation a user might wish to transfer files between
|      two hosts, neither of which is a local host. The user sets up
|      control connections to the two servers and then arranges for a
|      data connection between them.  In this manner, control information
|      is passed to the user-PI but data is transferred between the
|      server data transfer processes.  Following is a model of this
|      server-server interaction.
|
|      
|                    Control     ------------   Control
|                    ---------->| User-FTP |<-----------
|                    |          | User-PI  |           |
|                    |          |   "C"    |           |
|                    V          ------------           V
|            --------------                        --------------
|            | Server-FTP |   Data Connection      | Server-FTP |
|            |    "A"     |<---------------------->|    "B"     |
|            -------------- Port (A)      Port (B) --------------
|      
|
|                                 Figure 2

  $B$N$h$&$J$b$N$O(B HTTP $B$G$O=PMh$J$$$H;W$$$^$9$,!"$I$&$G$7$g$&(B?

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