chromium/third_party/blink/web_tests/http/tests/security/referrerPolicyHeader/resources/referrer-and-host.php

<?
header('Access-Control-Allow-Origin: *');
header('Content-Type: text/json');
?>
{
  "referrer": "<? echo $_SERVER['HTTP_REFERER'] ?? null; ?>",
  "host": "<? echo $_SERVER['HTTP_HOST'] ?? null; ?>"
}