JBZoo\Utils\Url::isHttps PHP Method

    public static function isHttps($trustProxyHeaders = false)
    {
        // Check standard HTTPS header
        if (Arr::key('HTTPS', $_SERVER)) {
            return !empty($_SERVER['HTTPS']) && $_SERVER['HTTPS'] !== 'off';
        }
        if ($trustProxyHeaders && Arr::key('X-FORWARDED-PROTO', $_SERVER)) {
            return $_SERVER['X-FORWARDED-PROTO'] === 'https';
        }
        // Default to not SSL
        return false;
    }

 /**
  * Get user avatar by email
  *
  * @param int    $avatarSize
  * @param string $defaultPic
  * @return string
  */
 public function getAvatar($avatarSize = 64, $defaultPic = 'identicon')
 {
     $md5 = md5(trim($this->_email));
     $avatarSize = (int) $avatarSize;
     $defaultPic = trim($defaultPic);
     $validList = array('404', 'mm', 'identicon', 'monsterid', 'wavatar', 'retro', 'blank');
     if (strpos($defaultPic, 'http') === 0) {
         $default = urlencode($defaultPic);
     } elseif (Arr::in((string) $defaultPic, $validList)) {
         $default = $defaultPic;
     } else {
         $default = 'identicon';
     }
     if (Url::isHttps()) {
         $avatarUrl = 'https://secure.gravatar.com/avatar/' . $md5 . '.jpg?s=' . $avatarSize . '&d=' . $default;
     } else {
         $avatarUrl = 'http://www.gravatar.com/avatar/' . $md5 . '.jpg?s=' . $avatarSize . '&d=' . $default;
     }
     return $avatarUrl;
 }