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chromium/third_party/blink/web_tests/http/tests/inspector-protocol/network/resources/multiple-headers.php 

<?php
    // We need live headers, so make sure it's not cached.
    header('Cache-Control: no-cache, no-store, must-revalidate, max-age=0');
    header('Access-Control-Pragma: value1');
    header('Access-Control-Pragma: value2', false /* = $replace */);
?>
<html>
<body>
Hello, world!
</body>
</body>