setWebHook.html

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <title>set webhook</title>
</head>
<body>
<form id="sendForm" action="" method="POST">
  <ul>
    <li><label>Токен: <input type="text" id="token"/></label></li>
    <li><label>URL: <input type="text" id="url" name="url"/></label></li>
    <li>
      <button onclick="setWebhook(); return false;">Установить Webhook</button>
    </li>
  </ul>
</form>
<script>
  const setWebhook = function () {
    let token = document.getElementById('token').value;
    let actionUrl = `https://api.telegram.org/bot${ token }/setWebhook`;
    document.getElementById('sendForm').setAttribute('action', actionUrl);
    document.getElementById('sendForm').send();
  };
</script>
</body>
</html>