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/d6f30882a742847fd0d1afedec0b9b2535f44d83/docs You should set ROOT_URL correctly, otherwise the web may not work correctly.