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[svn] Don't advertise --no-dns-cache as necessary for dyndns downloads.

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hniksic 2005-04-17 16:26:26 -07:00
parent 49ebd62276
commit 1aa8ce44c8
2 changed files with 22 additions and 19 deletions
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5
doc/ChangeLog
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@ -1,3 +1,8 @@
2005-04-18 Hrvoje Niksic <hniksic@xemacs.org>
* wget.texi (Download Options): Don't claim that --no-dns-cache is
necessary for dyndns servers -- it's not.
2005-04-08 Larry Jones <lawrence.jones@ugsplm.com>
* Makefile.in (wget.info): Don't use $< in an explicit rule.

36
doc/wget.texi
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@ -813,26 +813,24 @@ Setting quota to 0 or to @samp{inf} unlimits the download quota.
@cindex DNS cache
@cindex caching of DNS lookups
@item --dns-cache=off
Turn off caching of DNS lookups. Normally, Wget remembers the addresses
it looked up from DNS so it doesn't have to repeatedly contact the DNS
server for the same (typically small) set of addresses it retrieves
from. This cache exists in memory only; a new Wget run will contact DNS
again.
@item --no-dns-cache
Turn off caching of DNS lookups. Normally, Wget remembers the IP
addresses it looked up from DNS so it doesn't have to repeatedly
contact the DNS server for the same (typically small) set of hosts it
retrieves from. This cache exists in memory only; a new Wget run will
contact DNS again.
However, in some cases it is not desirable to cache host names, even for
the duration of a short-running application like Wget. For example,
some HTTP servers are hosted on machines with dynamically allocated IP
addresses that change from time to time. Their DNS entries are updated
along with each change. When Wget's download from such a host gets
interrupted by IP address change, Wget retries the download, but (due to
DNS caching) it contacts the old address. With the DNS cache turned
off, Wget will repeat the DNS lookup for every connect and will thus get
the correct dynamic address every time---at the cost of additional DNS
lookups where they're probably not needed.
However, it has been reported that in some situations it is not
desirable to cache host names, even for the duration of a
short-running application like Wget. With this option Wget issues a
new DNS lookup (more precisely, a new call to @code{gethostbyname} or
@code{getaddrinfo}) each time it makes a new connection. Please note
that this option will @emph{not} affect caching that might be
performed by the resolving library or by an external caching layer,
such as NSCD.
If you don't understand the above description, you probably won't need
this option.
If you don't understand exactly what this option does, you probably
won't need it.
@cindex file names, restrict
@cindex Windows file names
@ -1065,7 +1063,7 @@ Write down the name and value of the cookie, and manually instruct Wget
to send those cookies, bypassing the ``official'' cookie support:
@example
wget --cookies=off --header "Cookie: @var{name}=@var{value}"
wget --no-cookies --header "Cookie: @var{name}=@var{value}"
@end example
@cindex saving cookies