Comments on: Caching and Wordpress

By: labrator

labrator — Sat, 27 Sep 2008 21:59:23 +0000

From what I can tell, it’s not a problem with the page, it’s a problem with the headers being set on the image on the way out. This is a server configuration issue and it’s unlikely you can change it, although WordPress pros may know better.

Each image you’re uploading has an expires header set 1 week in the future. This is a common feature on high bandwidth sites to conserve said bandwidth. To get around this you could either wrap the serving of the image in a custom PHP file and set your own expires headers, or you could get the consumers of your images to link to the file with a timestamped querystring. Typically if any file has a different querystring, browsers will treat it as a separate file and get it again, so if you keep changing the querystring, they’ll keep getting it.

Try like this:
imagename.gif?t=

By: Rex Widerstrom

Rex Widerstrom — Sat, 27 Sep 2008 04:09:13 +0000

Okay that makes even less sense unless I explain I’m suggesting that go into the tags on the pages of any blog displaying the graphic, not the one on which it’s hosted. And that it works client-side by telling the browser to reload a fresh copy of the page and its content every time it visits (which slightly degrades performance, I know).

Unless you use Flash *shudder*. I think I saw this done via DHTML once. If I could shake of this spring flu I might remember where :-/

By: Rex Widerstrom

Rex Widerstrom — Sat, 27 Sep 2008 03:50:52 +0000

Well there’s always in the metatags part of the page header (assuming there’s nothing else you can do, because that’s not always respected by browsers, though I believe adding as well captures the majority).

Now no doubt someone who knows Wordpress (I haven’t a clue) is about to come along and make me look like a twat. Oh well…

By: scrubone

scrubone — Fri, 26 Sep 2008 22:36:30 +0000

You should correct the post – it reads wordpress.org

Have you tried putting the actual file on this site, and including a reference to it on that one?

By: David Farrar

David Farrar — Fri, 26 Sep 2008 22:27:22 +0000

The problem is this is hosted by wordpress.com, not hosted on a server I control.

By: Peter

Peter — Fri, 26 Sep 2008 22:08:11 +0000

Look up WP Super Cache. Probably need to run it as a cron job on the server.