Your ROOT_URL in app.ini is https://source.parasitstudio.de:63000/ but you are visiting https://source.parasitstudio.de/wirtz/uClock/src/commit/40537898316823a01e37a87e0f2628e3a7a60148/examples/MidiClock
You should set ROOT_URL correctly, otherwise the web may not work correctly.
midilab