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/59e11fd79f9a5231afd68a018b3df2c21dd66c4d/examples/AudioTestPeakRMS
You should set ROOT_URL correctly, otherwise the web may not work correctly.