php-generated images & connection

I have a very simple php image script that's loaded with the js onload event - the point is that the pages are given cache info and are cacheable, but the image produced by the script is non-cacheable, so it can deliver pageview & referrer info to the database.

At the moment, the image script (

c.php

) goes like this:


/* caching headers */ 
header('Content-Type: image/gif'); 
header('Expires: Mon, 26 Jul 1997 05:00:00 GMT'); 
header('Last-Modified: ' . gmdate('D, d M Y H:i:s') . ' GMT'); 
header('Cache-Control: no-store, no-cache, must-revalidate'); 
header('Cache-Control: post-check=0, pre-check=0', false); 
header('Pragma: no-cache'); 
/* content length header */ 
header('Content-Length: '.filesize('trans.gif')); 
readfile('trans.gif'); 
/* db stuff to log pageview and referrer */

trans.gif

is a 1x1 transparent gif. At the moment, when I view the page with firefox, the status bar shows 'Transferring data from [domain.com]', and doesn't go away. Getting this file directly just shows the image (have changed it to a visible image to make sure it works), it loads nice and quick.

The included .js is:


function stim() { 
cimg=new Image(); 
reff=document.referrer; 
cimg.src="http://www.bugfoo.com/c.php?ref="+reff; 
}

and it gets called with

<body onload="stim()">

What's likely here? Am I reaping the consequences of being a javascript moron, or is it likely that somehow filesize isn't returning the correct content length? Any input much appreciated.

nb: just ditching the content-length header doesn't change anything

php-generated images & connection

images seem to be prolonging connection

mincklerstraat

dmorison

mincklerstraat

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