Re: FTP keep alive connection
Date: Mon, 5 Nov 2007 18:44:24 +0000
Patrick Monnerat wrote:
> Michel Loiseleur wrote:
> > In one sentence, this patch add a small feature to curl during ftp
> transfer : it sends "NOOP" message in order to keep connection alive.
> I think it must be an option, since this is not guaranteed by RFC959 to
> be properly processed by all servers.
Actually it is. From RFC959:
In order to make FTP workable without needless error messages, the
following minimum implementation is required for all servers:
TYPE - ASCII Non-print
MODE - Stream
STRUCTURE - File, Record
COMMANDS - USER, QUIT, PORT,
TYPE, MODE, STRU,
for the default values
> If the goal is only to keep a firewall alive (but not the FTP server
> itself), I would prefer to use setsockopt(SO_KEEPALIVE), because only
> housekeeping data are exchanged (no TCP payload).
SO_KEEPALIVE isn't available on all platforms with TCP, though.
Received on 2007-11-05