Your ROOT_URL in app.ini is https://source.parasitstudio.de:63000/ but you are visiting https://source.parasitstudio.de/wirtz/music-synthesizer-for-android/commits/commit/dedde725d2b57b0d196b46fe6fec89ba84d05d23/android/res/drawable-mdpi/icon.png
You should set ROOT_URL correctly, otherwise the web may not work correctly.