Your ROOT_URL in app.ini is https://source.parasitstudio.de:63000/ but you are visiting https://source.parasitstudio.de/wirtz/MicroDexed/src/commit/cbdb18e500a2253db3cae93dd7561a8916f95b4e/third-party/ArduinoJson/examples/JsonServer
You should set ROOT_URL correctly, otherwise the web may not work correctly.