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/bd14b2b8855c7f1963ea3a4d3499db7de05b5f13/examples/TestLoader
You should set ROOT_URL correctly, otherwise the web may not work correctly.