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Re: How long does an IP address change take?
On Thu, Nov 01, 2001 at 02:53:43PM -0600, Jay Link wrote:
> > After reading Jay's post, I wondered, how is that possible? 1) Jay, how
> > did you learn that? 2) I am sure you mean IP info, and not actual
> > content (IOW, foxnews.com, etc., etc. showing yesterday's news).
> No, I *do* mean actual content, except that you raise a good point:
> dynamic information does seem to be current. So, AOL's "barrier" of
> caching (incoming) web servers must be smart enough to only cache static
Most proxy servers are. Search around for "pragma nocache" and the like.
<META HTTP-EQUIV="Pragma" CONTENT="no-cache">
Will keep most proxies from caching your web page. HTTP 1.1 supporting
proxise will respect the
<META HTTP-EQUIV="Cache-Control" CONTENT="no-cache">
tag, and pretty much all of them will respect the
<META HTTP-EQUIV="Expires" CONTENT="Fri, 02 Nov 2001 11:48:55 CST">
kind of syntax.
It's usually best to use the "expires", as that allows caching proxies to
do their job. However, if your content is truly dynamic, no-cache will
work fine too.
BTW, CGI authors take note that these are the equivilent of headers
and the like. Finally, note that some versions of IE wills till cache
the page on disk unless you add a second <HEAD> section after the body in
an html document, and put the 'pragma: no-cache' in that second head. IE
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