NYCPHP Meetup

[Cliff Hirsch]

You can also look at some of the better AJAX tutorials. An AJAX request has
the same problem, and I have seen various ways to deal with it. The most basic
attaches a random # to every request, which is not the best way to go -- fills
up the local cache. Better methods do set the header as indicated below. A
quick google search found this:

header("Expires: Mon, 26 Jul 1997 05:00:00 GMT");
header("Last-Modified: " . gmdate("D, d M Y H:i:s") . " GMT");
header("Cache-Control: no-store, no-cache, must-revalidate");
header("Cache-Control: post-check=0, pre-check=0", false);
header("Pragma: no-cache");

Cliff

On Sat, 02 Dec 2006 12:19:45 -0500, David Krings wrote
> Hi,
> 
>     you need to set the page to not getting cached by a browser. I 
> once looked this up and found several sources that claim that these 
> two lines at the beginning of a page will turn caching off: 
> header("Cache-control: private"); header('P3P: CP="NOI ADM DEV PSAi 
> COM NAV OUR OTRo STP IND DEM"');
> 
>  From what I can tell, this works. But to be honest, I have no idea 
> what this really does or if it does anything, especially the second 
> line. Writing this kinda makes me want to know more about it, so I 
> did a quick google and found http://www.w3.org/P3P/ that has some 
> more info. The first line is most likely needed to pass on the cache 
> preferences through the header rather than take the browser default.
> 
>     Hope this helps,
> 
>              David
> 
> Aaron Fischer wrote:
> > Howdy,
> >
> > I have a logout page where I destroy the session.  However, if I click 
> > one of the application links it lets me back in.  I believe the 
> > browser is loading the application page from history.  If I refresh 
> > the page it kicks me out to the login page, which is the desired 
> > behavior but I would like that to happen right away.
> >
> > How do I ensure that my application pages are loading a fresh copy?  
> > If I can make that happen then presumably it will prevent this issue.
> >
> > The strange thing is that this doesn't seem to happen for another 
> > application I built but I haven't been able to find a difference in 
> > the code I wrote.  (Am testing both in the same browser.)
> >
> > Thanks,
> >
> > -Aaron