PortalService constructor

Implementation

PortalService() {
  // Emulate the NTUT iOS app's HTTP client
  _portalDio = createDio()
    ..options.baseUrl = 'https://app.ntut.edu.tw/'
    ..options.headers = {
      'User-Agent': 'Direk ios App',
      // Prevent keep-alive connection reuse — NTUT servers close their end
      // after multipart uploads, causing stale connection errors.
      'Connection': 'close',
    };
}