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/cc51d84a757fe125342974e0fa973a18c28e372c/examples/TestFIRGeneral3
You should set ROOT_URL correctly, otherwise the web may not work correctly.