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Tracking Pixel Issues and Gmail Proxy

I am trying to implement a custom tracking pixel for emails sent from Wordpress.

Thanks to this post:

Email Tracking with PHP and Image

Email Tracking Starts with a Real Image

and especially

http://www.phpdevtips.com/2013/06/email-open-tracking-with-php-and-mysql/

I was able to realize the main idea.

Email downloads tracking pixel via       <img src="https://www.example.com/tracking.php?order_id=1" width="100" height="100" />

and in tracking.php file

$graphic_http =  'https://www.example.com/GIF-example.gif';

header('Content-Type: image/gif');
readfile( $graphic_http );

Opening the tracking.php file in a browser opens a gif image for download.

However, the tracking / tracking image does not appear in Gmail email. There is only a broken image logo, and when I click to show the image, this link is open

https://ci5.googleusercontent.com/proxy/l2xUKFGnNFKm64zEYmJhOcUmEJm15w9MC1txRRF01tpKlcL3t3O16aMJgbYQkucBySV0xV2T0EsCwikOAC0Z4em6uPzSs38lkHrYBvosRRAk14EfPoEXqC5JdLxRm8ToZmGSQqt_RwHCaBE_3uLgQDVEB05Rdtkq-Xzuw30=s0-d-e1-ft#https://www.example.com/tracking.php?order_id=1

Google 404:

Google 404. .

URL//l2xUKFGnNFKm64zEYmJhOcUmEJm15w9MC1txRRF01tpKlcL3t3O16aMJgbYQkucBySV0xV2T0EsCwikOAC0Z4em6uPzSs38lkHrYBvosRRAk14EfPoEXqC5JdLxRm8ToZmGSQqt_RwHCaBE_3uLgQDVEB05Rdtkq-Xzuw30 = s0--1- . , .

, , - Google php script. tracking.php GIF-example.gif 775 .

Hotmail , , , Google Proxies.

- , Google Proxies ?

+4
2

: Google Proxies ? https://www.example.com/tracking.php?order_id=1

Google Proxies , , 404.

https://www.example.com/tracking.php/order_id=1, tracking.php $_GET, $_SERVER['REQUEST_URI'] /order_id=.

Gmail tracking.php script.

+2

( , ). , .

, :

$orderId = isset($_GET['order_id']) ? $_GET['order_id'] : null;

if ($orderId) {
    // Save stuff in your DB or how you want to log it.
}

header('Content-Type: image/gif');
echo file_get_contents('/absolute/path/to/image.gif');
exit; // Not really necessary, but just to make sure there no more output.
0

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