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/21fe4b37dcf1db58114b6810f0ab0ec8b9bce98e/examples You should set ROOT_URL correctly, otherwise the web may not work correctly.