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/55c8d8082cdd065a9d4797b1ef23f7bd9ddcb560/examples/NoiseGate
You should set ROOT_URL correctly, otherwise the web may not work correctly.