gif - Why does this PHP tracking pixel not working correctly? -


i'm working on setting simple pixel tracking script php, , below technically works, when @ inspector in safari following warning (1by1.gif 42b gif):

esource interpreted document transferred mime type image/gif.

header("content-type: image/gif"); header("content-length: 42"); echo file_get_contents("/path/to/1by1.gif"); // tracking stuff below here

i've looked @ other tracking pixels, , show in inspector if actual image, .php extension. ideas how fix warning?

edit:

i tried doing following , same warning:

header("content-type: image/gif"); $img = imagecreatefromstring(file_get_contents("/path/to/1by1.gif")); imagegif($img);

you write 1x1.gif (or other made name) in html source , have apache serve php script. can .htaccess along lines of:

rewriteengine on rewritecond %{request_filename} !-f rewriterule ^1x1\.gif$ tracking_script.php [nc,l]

this way safari sees gif extension , won't complain.


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