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/8767bf487400cbfbf5f8ef4b7448db32a39af51b/examples/BasicGain_Float
You should set ROOT_URL correctly, otherwise the web may not work correctly.