Image src generated through php file

[nak5ive]

I've built a custom image gallery, integrated with a database.

all of the images are kept above the document root in a "media" directory (for security purposes); therefore, i am using a php script in the src attribute of the image tags to display the image in the browser.

 

to accomplish this, i chose to use the PEAR package "HTTP_Download", which worked great and performed fantastically on my staging server.  I chose to use content-disposition inline, and set caching options on.

 

the problem, the images don't cache on a users machine.  therefore, everytime the page is changed to display a new image, all of the thumbnails are downloaded once again...very annoying.

 

let me re-iterate, these files are not being generated on the fly, simply sent to the user via php.

 

here is an example of an image src attribute:

<img src="http://url.com/download/image?s=gt&id=2e7bea0eeb438cccb6232ec7d46cdc0c"/>

 

here are sample headers being sent to and from the browser:

Response Headers
Date	Mon, 23 Jul 2007 19:15:33 GMT
Server	Apache/2.2.4 (Win32) mod_python/3.3.1 Python/2.4.3 PHP/5.2.0
X-Powered-By	PHP/5.2.0
Expires	Thu, 19 Nov 1981 08:52:00 GMT
Cache-Control	public, must-revalidate, max-age=0
Pragma	cache
Accept-Ranges	bytes
x-sent-by	PEAR::HTTP::Download
Last-Modified	Sat, 21 Jul 2007 02:38:18 GMT
content-disposition	inline; filename="37.jpg"
Etag	"9c4ccc931266077ac50cbe1a6150c811-1783420111"
Content-Length	4206
Content-Type	image/jpeg

Request Headers
Host	kingthief.nak5.com
User-Agent	Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.8.1.5) Gecko/20070713 Firefox/2.0.0.5
Accept	application/x-shockwave-flash,text/xml,application/xml,application/xhtml+xml,text/html;q=0.9,text/plain;q=0.8,image/png,*/*;q=0.5
Accept-Language	en-us,en;q=0.5
Accept-Encoding	gzip,deflate
Accept-Charset	ISO-8859-1,utf-8;q=0.7,*;q=0.7
Keep-Alive	300
Connection	keep-alive
Referer	http://url.com/gallery/?p=5751e61698d4d66fafaa8f0bb4f4926c
Cookie	kingthief=mgcdn8ama8r4r4qeku1qjqpk70
If-Modified-Since	Sat, 21 Jul 2007 02:38:18 GMT
If-None-Match	"9c4ccc931266077ac50cbe1a6150c811-1783420111"

 

does anyone know of a good script that will cache images on a local browser in this way?

waiting for thumbnail re-loading everytime the page changes is just horrible...

 

thanks!

 

Al.