code: public function getPort()
      {
          if ($this->_port === null) {
              $serverPort = $this->getServerPort();
              $this->_port = !$this->getIsSecureConnection() && $serverPort !== null ? $serverPort : 80;
          }
  
          return $this->_port;
      }
docs: Returns the port to use for insecure requests.
  Defaults to 80, or the port specified by the server if the current
  request is insecure.
  @return int port number for insecure requests.
  @see setPort()