Your ROOT_URL in app.ini is https://source.parasitstudio.de:63000/ but you are visiting https://source.parasitstudio.de/wirtz/MicroDexed/src/commit/8489f2407306e787b63511bc3c3038e2b6f6b610/third-party/ArduinoJson/extras/tests/MsgPackDeserializer You should set ROOT_URL correctly, otherwise the web may not work correctly.