Your ROOT_URL in app.ini is https://source.parasitstudio.de:63000/ but you are visiting https://source.parasitstudio.de/wirtz/AutoConnect/src/commit/aeefb2d179ab89df9bb626cc9feb3fd6d5aa8284/examples/mqttRSSI_FS/data
You should set ROOT_URL correctly, otherwise the web may not work correctly.