code: protected function redirect(string $uri, bool $isPermanent = false): void
      {
          $nCode = $isPermanent ? 301 : 302;
          Headers::getInstance()
              ->addByHttpCode($nCode)
              ->add('Location: '.$uri)
              ->run();
          exit;
      }
docs: The method redirects to the URL, which passed as param. The HTTP-code is
  302 as default. The method unconditional completes the script execution,
  the code after it will not be executed.
  @param string $uri
  @param bool $isPermanent The flag of permanent redirect.
  @return void