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Bypass cache for images?

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Feb 05.2006

I would like to display a gif image within a page that will change frequently (approx every 60 seconds). Is it possible to code a html parameter so that the user will always download the latest version of the graphic and not just see the one that is stored in their cache?

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@ray326Feb 05.2006 — The most robust way to do it would be from the server. You'd send the image with a header that indicates it's already expired.
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@Old-FriendauthorFeb 05.2006 — Sorry if I'm a bit thick, but how would I do that?
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@ray326Feb 06.2006 — Question #1 would be, do you have any server side programming capability?
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@Old-FriendauthorFeb 06.2006 — The page is delivered by a PHP program. So in that sense it is server side program. But this server side program is just producing HTML to load the graphic.

ie;

[code=php]
<?php
....... code here ......

echo '<img src="http://www.xxxxx.com/images/xxxxxxx.gif" alt="Latest Data" />'

....... code here ......
?>
[/code]
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@ray326Feb 07.2006 — <img src="showimg.php" alt="Latest Data" />

Then the showimg.php would run the full HTTP protocol to deliver the image, including sending the content-type and expiration headers.
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@Old-FriendauthorFeb 07.2006 — OK. Then what can I add to the php program that would indicate that the gif file expires?
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@ray326Feb 08.2006 — PHP has a function to send HTTP headers but I'm not a PHPer so I'll recommend you ask in that forum.
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@Old-FriendauthorFeb 08.2006 — [URL=http://www.webdeveloper.com/forum/showthread.php?p=509635#post509635]OK thanks. Question asked here[/URL]
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