<html><body>
</head>
<form name="captcha_form" action="/captcha_resp" method="POST" enctype="application/x-www-form-urlencoded">
     <div id="example3">
     <input type=hidden name=rtoken id="rtoken">
     </div>
     <br/>
</form>
  <script src="https://www.google.com/recaptcha/api.js?render=6Lf3-A0aAAAAAP72ObXbJOz6cPF-VD6GwP6Zw-oP ">
    </script>
<script type="text/javascript">
 grecaptcha.ready(function() { 
    grecaptcha.execute('6Lf3-A0aAAAAAP72ObXbJOz6cPF-VD6GwP6Zw-oP', {action: 'captcha_resp'}).then(function(token) { 
    document.getElementById('rtoken').value = token; 
    document.captcha_form.submit();
      });
 }); 
</script>
</body></html>
                                                                                                                                                                                                                                                                