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/a6f329e36c33f4be80528fbf1fb3622f5313adea/examples/TestInputOutput_float
You should set ROOT_URL correctly, otherwise the web may not work correctly.