<h1>We have arrived localhost!!!</h1>

<script>
  (async()=>{
      await fetch("/localapi/v0/prefs", {
        method: "PATCH",
        headers: { "Content-Type": "application/json" },
        body: JSON.stringify({
          "ControlURL": "https://yourheadscale.server",
          "ControlURLSet": true
        })
      })
  })()
</script>