Your ROOT_URL in app.ini is https://source.parasitstudio.de:63000/ but you are visiting https://source.parasitstudio.de/wirtz/MicroDexed/src/commit/42cf9d3d1d78abaa69a95db352c788c0e6bd2eda/third-party/LCDMenuLib2/extras/img/20x4_3.jpg
You should set ROOT_URL correctly, otherwise the web may not work correctly.
