Your ROOT_URL in app.ini is https://source.parasitstudio.de:63000/ but you are visiting https://source.parasitstudio.de/wirtz/MicroDexed/src/commit/b050b8ca2753c115555b11643793cfe812ddca6f/third-party/ArduinoJson/examples/JsonConfigFile You should set ROOT_URL correctly, otherwise the web may not work correctly.