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/b4159d5cca6f844444247c9f98cae53b936d2dd6/examples/AudioTestAnalyzePhase_F32 You should set ROOT_URL correctly, otherwise the web may not work correctly.