Your ROOT_URL in app.ini is https://source.parasitstudio.de:63000/ but you are visiting https://source.parasitstudio.de/wirtz/MicroDexed/src/commit/71ee0ecbccb519b6cb63fb95e32b2d1dc1ac4a50/third-party/ArduinoJson/extras You should set ROOT_URL correctly, otherwise the web may not work correctly.