Your ROOT_URL in app.ini is https://source.parasitstudio.de:63000/ but you are visiting https://source.parasitstudio.de/wirtz/MicroDexed/src/commit/7f39351d3cc3575aa214924e2d8d7a99f7eb3d62/third-party/ArduinoJson/examples/JsonHttpClient
You should set ROOT_URL correctly, otherwise the web may not work correctly.