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How to force browsers to clear cache?

Force IE7 to use cache?

  • Force IE7 to use cache? I have a javascript preloader that loads a bunch of images used by my client's image-heavy web site. On Firefox and older IE, this works fine, but IE7 seems to ignore the fact that the images were preloaded, and this results in a very ugly load sequence with parts of the page appearing in patchwork fashion. Can I force IE7 to use the images I just preloaded? I know about meta and http "no-cache" but what about the reverse? Also, I am aware that individual cache settings are in play here.

  • Answer:

    When you say "Can I force..." do you mean you-as-the-viewer or you-as-the-website-creator?

CaptApollo at Ask.Metafilter.Com Visit the source

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You probably want to be looking at the Expires, Pragma and Cache-Control headers that the server is sending. It should be telling the client that it can use the images from cache and setting Expires in the future (if only an hour). Test it with http://ask.metafilter.com/84583/How-do-I-find-the-values-being-sent-to-a-website-from-my-computer.

idb

I mean me as the website creator.

CaptApollo

Firstly, are you sure you haven't changed your own settings in IE7? A lot of web developers change from the default to discourage any caching to make testing easier. If the images are hosted on Apache, it should be fairly easy to use .htaccess/httpdconf to send some Expires and Cache-Control headers for any images served from a particular folder, and that might do the trick. Also check there's nothing unusual about the images that might be discouraging caching, e.g. some browsers won't cache files whose URLs have query strings.

malevolent

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