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chromium/third_party/blink/web_tests/http/tests/security/referrerPolicyHeader/referrer-from-document-on-preload.php 

<?php
header("Referrer-Policy: origin-when-cross-origin");
?>
<html>
<head>
</head>
<img src="http://localhost:8000/security/resources/green-if-referrer-is-origin.php" />
</html>