title: Google reCAPTCHA fail for second time submit
body: <p>I implement the reCAPTCHA in this tutorial, </p>
  
  <p><a href="https://codeforgeek.com/2014/12/google-recaptcha-tutorial/" rel="noreferrer">https://codeforgeek.com/2014/12/google-recaptcha-tutorial/</a></p>
  
  <p>which work well for the first time submit. The problems I have are:</p>
  
  <ol>
  <li><p>I send the captcha with other form data e.g. username , email etc.... so if captcha is correct but other not , the user will send it again, but the second time it return "{ "success": false }"</p></li>
  <li><p>if I idle it for ~2 min , it will session expire and if I select the box it pop up alert and warning something like " can not refresh : invalid parameter", and I can not select the box again</p></li>
  </ol>
  
  <p>How to fix those problem? Thanks a lot.</p>