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/f50a9da73fbda6483dcb0c578b3e91bc36aa9362/examples/TestFFT1024iq You should set ROOT_URL correctly, otherwise the web may not work correctly.