polling-1

data.json

{
  "status": "Pending..."
}

index.html

<p>
  <span>Status:&nbsp;</span>
  <span id=spnStatus></span>
</p>
<script>
  let spnStatus = document.getElementById("spnStatus");
  spnStatus.textContent = "Nihil";

  setInterval(async function(){
    const response = await fetch('/data.json',{
      "pragma": "no-cache",
      "cache-control": "no-cache"
    });
    const json = await response.json();
    spnStatus.textContent = json.status;
  }, 1000);
</script>