images doesn't seem to cache

[anders thoresson <listor@xxxxxxxxxxxxx>]

Hi,

I put all my images outside the web root, the prevent direct access, and 
then access them with a <img>-tag like this:

<img src="fnc_get_image.php?path=<?=$path;?>" />


where fnc_get_image.php is:

// Check if user is logged in
require_once 'global_includes.php';
$user =& new User();

// Get path to image for display
$path = $_GET['path'];

// Prepend path - prevents misuse
$pPath = "/home/username/albums/" . $path;

header("Cache-Control: private");
$extention = substr($path, -3);
if ($extention == "jpg")
    header("Content-type: image/jpeg");
if ($extention == "gif")
    header("Content-type: image/gif");
if ($extention == "bmp")
    header("Content-type: image/bmp");
if ($extention == "png")
    header("Content-type: image/png");
readfile("$pPath");


There is one slight problem though: To my eyes, it looks like the images
are downloaded from the server every time. Is this a side effect of this
method or is it just a optical illusion? Is there a way to tell for sure
if the image is downloaded or displayed from the browser cache?

I've tried with and without a Cache-Control header. It doesn't seem to 
do any difference at all.

Best regards,

Anders

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