Richard Lynch wrote:
> On Wed, August 2, 2006 7:38 am, Manoj Singh wrote:
>
>> I am creating a a script in which a dynamic graph is generated through
>> gd
>> library. The format of the picture is jpeg. Now the problem is that
>> the
>> browser is caching the images and after updating also it is displaying
>> the
>> older image.
>>
>> Currently for clearing the cache i am using this code
>> <?php
>> header("Last-Modified: " . gmdate("D, d M Y H:i:s") . " GMT");
>> header("Cache-Control: no-store, no-cache, must-revalidate");
>> header("Cache-Control: no-cache");
>> header("Pragma: no-cache");
>> ?>
>>
>> But this code is not working me. Please help me.
>
> Unfortunately, all the headers in the world won't fix ALL the
> browsers, because there is always somebody (browser or intermediary
> caching server like AOHell) that thinks they know better than you when
> to cache an image.
>
> You'll spend hours "fixing" this with different headers, and it will
> work in all your browser tests, and then somebody using Fred's
> Warehouse Browser" will send in a bug report that your site is
> "broken"
>
> Also note that only the SECOND Cache-Control: header is being sent by
> PHP unless you use the optional second arg to ask PHP to send both:
> http://php.net/header
>
> The best solution to this is to change your IMG tag to have a random
> number in it, so that the cached image is never the same URL, so it
> never gets used.
>
> Stupid, I know, and wasteful of the browser cache disk space, but
> there it is. It works.
nevermind their diskspace, what about my bandwidth? - do I really need to
cough up extra readies because some muppet refused to exchange his AOL
connection for something resembling a proper ISP?
granted yours is pragmatic solution to the problem but should we support
shit ISPs, proxies and sunday-driver browser-wannabees with our/our-clients
cash?
feel free to ignore, it's late and I felt like playing devil's advocate. :-)
>
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