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class phpbb_recaptcha extends phpbb_default_captcha
{
   var $recaptcha_server = 'http://www.google.com/recaptcha/api';
   var $recaptcha_server_secure = 'https://www.google.com/recaptcha/api'; // class constants :(

   // We are opening a socket to port 80 of this host and send
   // the POST request asking for verification to the path specified here.
   var $recaptcha_verify_server = 'www.google.com';
   var $recaptcha_verify_path = '/recaptcha/api/verify';

   var $challenge;
   var $response;

   // PHP4 Constructor
   function phpbb_recaptcha()
   {
      $this->recaptcha_server = (isset($_SERVER['HTTPS']) && $_SERVER['HTTPS'] == 'on') ? $this->recaptcha_server_secure : $this->recaptcha_server;
   }

   function init($type)

grep HTTPS /etc/nginx/conf.d/fastcgi_params.txt
                fastcgi_param  HTTPS                            on;

        location ~\.php($|/) {
...
                fastcgi_param  HTTPS on;
...