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/88a600a9160376e536bb380478ead36ef72c813a/examples/TestFFT1024iq You should set ROOT_URL correctly, otherwise the web may not work correctly.