Your ROOT_URL in app.ini is https://source.parasitstudio.de:63000/ but you are visiting https://source.parasitstudio.de/wirtz/uClock/src/commit/ea3375c2667ff4103725a5da50f97cf3168fe7f3/examples/XiaoUsbMasterMidiClock
You should set ROOT_URL correctly, otherwise the web may not work correctly.
midilab