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function getProtocol() {
  if (isset($_SERVER['HTTPS']) && 
      ($_SERVER['HTTPS'] == 'on' || $_SERVER['HTTPS'] == 1) ||
      isset($_SERVER['HTTP_X_FORWARDED_PROTO']) &&
      $_SERVER['HTTP_X_FORWARDED_PROTO'] == 'https') {
      $protocol = 'https';
  }
  else {
      $protocol = 'http';
  }
  return $protocol;
}