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/5b4bca69ad2222f78015fd3fafb4d61d32c358a5/examples/TestFFT1024iq
You should set ROOT_URL correctly, otherwise the web may not work correctly.