Problem reading a cookie from within a tracking pixel in IE

I wrote a simple pixel tracking program that works something like this

Step 1) tracker.com sets a cookie

Step 2) mysite.com displays <img 开发者_如何学运维src="tracker.com/tracking.php">. That image reads the cookie from Step 1 & does some processing.

Works great in Chrome, Firefox and Safari. But when tested in IE, the cookie can't be read in Step 2. It's as if the cookie doesn't exist -- but I know it does.

Any idea why IE pretends the cookie doesn't exist? I've tried messing with P3P headers, no luck.

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Does your domain have a privacy policy? I forget what it's called, maybe p3p? Some random list of headers that you have to add.

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Try adding the domain in the src attribute to trusted sites in IE. My guess is this is security, and you've got a rather arcane security measure you're coming up against.

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If the cookie setting domain is 2 letters, I believe there is a bug within IE that prevents IE from doing cookies properly with 2 letter domains. If it isn't 2 letters, then nevermind.

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It may be that IE is blocking 3rd-party cookies.

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Its tricky without knowing more specifics of its use, but I'm trying at this late hour to figure out how to clone the cookie for the current domain using REMOTE_ADDR

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So, the first answer was more about testing... try using JS to handle this -

From site-reference.com forums..

<script type='text/javascript'>
var track = new Image(); 
track.src="http://www.my-site.com/tracker.php?self=" + this.location;
</script>

*NOTE: Capital "I" in image, not lowercase!

Let us know! :D

Fred