Your ROOT_URL in app.ini is https://source.parasitstudio.de:63000/ but you are visiting https://source.parasitstudio.de/wirtz/OpenAudio_ArduinoLibrary/src/commit/59acb746aeeb57bf51aeddc61a0b9ae0430abbe9/examples/testWDRC2
You should set ROOT_URL correctly, otherwise the web may not work correctly.