Your ROOT_URL in app.ini is https://source.parasitstudio.de:63000/ but you are visiting https://source.parasitstudio.de/wirtz/OpenAudio_ArduinoLibrary/commits/commit/dda63cff57fcaeca3e7d76af649bfb1b5817dfa4/docs You should set ROOT_URL correctly, otherwise the web may not work correctly.