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/ce44604c8316aaefdb58f98a2a265a9a92e9879a/examples/BasicGain_Float
You should set ROOT_URL correctly, otherwise the web may not work correctly.