Your ROOT_URL in app.ini is https://source.parasitstudio.de:63000/ but you are visiting https://source.parasitstudio.de/wirtz/uClock/commits/commit/9d8865b024ac83abe7652292d7a4205caa0f449c/examples/STM32UartMasterMidiClock You should set ROOT_URL correctly, otherwise the web may not work correctly.