<?php
header("Link: < //wut.com.test/>; rel=preconnect");
?>
<!DOCTYPE html>
<script>
if (window.testRunner) {
testRunner.dumpAsText();
testRunner.waitUntilDone();
}
</script>
This test check if a Link header triggered a dns prefetch.
<script>
if (window.testRunner)
testRunner.notifyDone();
</script>