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/12af41ea12169c7d82eaad6fc06b3feecd62f727/examples/TestFFT256iq
You should set ROOT_URL correctly, otherwise the web may not work correctly.
boblark