code: public function getSecurePort()
      {
          if ($this->_securePort === null) {
              $serverPort = $this->getServerPort();
              $this->_securePort = $this->getIsSecureConnection() && $serverPort !== null ? $serverPort : 443;
          }
  
          return $this->_securePort;
      }
docs: Returns the port to use for secure requests.
  Defaults to 443, or the port specified by the server if the current
  request is secure.
  @return int port number for secure requests.
  @see setSecurePort()