Header Cache

[The Little Guy]

How come if I place this at the top of the page, it doesn't work?

 

header( "Cache-Control: no-store, no-cache, must-revalidate" );
header( "Cache-Control: post-check=0, pre-check=0", false );
header( "Pragma: nocache" );

 

I have a script that rotates images, then saves them, along with the new thumbnail, but when the page that I display the image on reloads, the image thumbnail hasn't change. If i press F5, or ctrl+F, or Refresh, then the thumbnail changes to the new updated image.

 

The above code is on the saves the new rotated image file, and on the page that displays the thumbnail.

 

[corbin]

You could try adding a Last-Modified header.... Not sure if that would fix it, but I suspect it might.

 

Example:

 

Last-Modified: Wed, 15 Nov 1995 04:58:08 GMT

[The Little Guy]

Nope didn't work

[corbin]

Ahhh got my headers confused....

 

Last-Modified being in the past means that the client would check that the new page is older than the cache, so don't update it ;p.

 

Remove that one I said a sec ago, and try using:

 

Expires: Thu, 01 Dec 1994 16:00:00 GMT

[The Little Guy]

Nope... That doesn't work either...

 

Here is what I have now:

 

<?php
header( "Cache-Control: no-store, no-cache, must-revalidate" );
header( "Cache-Control: post-check=0, pre-check=0", false );
header( "Pragma: nocache" );
header("Cache: no-cahce");
header("Expires: Thu, 01 Dec 1994 16:00:00 GMT");
?>

 

Does that look right?

[Aureole]

Try putting the Expires header first. ???

[The Little Guy]

Nope, didn't work.

[nezbo]

Sorry to be slightly off toppick.

 

but i have noticed this bit of code

 

header("Expires: Thu, 01 Dec 1994 16:00:00 GMT");

 

dose this make the page check for new data every time the page is loaded to save pressing F5 or Ctrl + F5

 

Neil