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POClear Apache cache for a specific image
 

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    <p>I implemented a system to edit images displayed on a website.</p> <p>When an image is edited, I want to display its last version on all pages of the site (where it's called), at least for the user who edited the image.</p> <p>Now I'm searching a better way to clear the cache for a specific image than adding the timestamp to the end :</p> <pre><code>&lt;img src="myimage.jpg?01215654" alt="" /&gt; </code></pre> <p><strong>Why ?</strong></p> <p>It supposes to always add the timestamp at the end of the image path, with a session system for example.</p> <p>But when the session expires (for example, user leaves the site, and go back few hours after), the real path of the image is displayed :</p> <pre><code>&lt;img src="myimage.jpg" alt="" /&gt; </code></pre> <p>And the navigator randomly displays the old image, or the last version... Because Apache cached :</p> <ul> <li>myimage.jpg as the old image</li> <li>myimage.jpg?01215654 as the new version because no one hit it before (was loaded as a new media)</li> </ul> <p><strong>Limitations</strong></p> <ul> <li>I can't change the path of an edited image, for example "myimage.jpg" to "myimage-v2.jpg", which could solve the problem...</li> <li>Images are not served from a controller (not served from a PHP script), they are direclty loaded from their path on the server.</li> <li>I don't want to use a session system that add timestamp or version string at the end of an image path with JS.</li> </ul> <p><strong>What I want</strong></p> <p>I want to say that the cache of "myimage.jpg" has expired, and so to display the last version, and then cache it normally, until the next edition. So I would like to load the image with "200 status", and not "304 modified" after an edit.</p> <p>Note : when an image is edited, <strong>I reload it with JS (JQuery)</strong> in a hidden div, if you now a way to change cache header ?</p> <p>So what I want is to clear the cache header of a specific image that is edited, taking into account the limitations of my project, so if possible by using cache directives without serving the image from a controller, is it possible ?</p>
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