title: Google Recaptcha v2 get requests fail
body: <p>I incorporated a v2 invisible Google recaptcha in a comment form, it always worked correctly. From yesterday it stops working and I got these messages in console during the recaptcha rendering (Chrome version 71.0.3578.98)</p>
  
  <p>GET <a href="https://www.gstatic.com/recaptcha/api2//styles__ltr.css" rel="nofollow noreferrer">https://www.gstatic.com/recaptcha/api2//styles__ltr.css</a> net::ERR_ABORTED 404
  GET <a href="https://www.gstatic.com/recaptcha/api2//recaptcha__it.js" rel="nofollow noreferrer">https://www.gstatic.com/recaptcha/api2//recaptcha__it.js</a> net::ERR_ABORTED 404
  Uncaught ReferenceError: recaptcha is not defined
      at anchor:179</p>
  
  <p>the problem seems to be the missing part in both url after api2/</p>
  
  <p>On the same browser, in incognito mode, everything works properly and the fetched urls are:
  <a href="https://www.gstatic.com/recaptcha/api2/v1545073489967/styles__ltr.css" rel="nofollow noreferrer">https://www.gstatic.com/recaptcha/api2/v1545073489967/styles__ltr.css</a>
  <a href="https://www.gstatic.com/recaptcha/api2/v1545073489967/recaptcha__it.js" rel="nofollow noreferrer">https://www.gstatic.com/recaptcha/api2/v1545073489967/recaptcha__it.js</a></p>
  
  <p>The same problem occurs using FF both in standard and incognito mode while in Edge it works.
  Cleaning the cache, deleting the cookies and rebooting PC (WIn10) don't resolve the problem. On a macOS machine the problem does not occur either in chrome or in ff, any idea ?
  Thanks in advance</p>