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/8353f29b1081063c3be5a6a6560603cdd732c809/examples/TestOutput_float
You should set ROOT_URL correctly, otherwise the web may not work correctly.