Your ROOT_URL in app.ini is https://source.parasitstudio.de:63000/ but you are visiting https://source.parasitstudio.de/wirtz/MicroDexed/src/commit/c3ccc2322d9b8e87568ccb8f220bc0c5dac95e5f/third-party/ArduinoJson/examples/StringExample
You should set ROOT_URL correctly, otherwise the web may not work correctly.