Your ROOT_URL in app.ini is https://source.parasitstudio.de:63000/ but you are visiting https://source.parasitstudio.de/wirtz/MicroDexed/src/commit/179fb4bea6150ad4cc6f4a6287397ffcafe5a934/third-party/ArduinoJson/extras/tests You should set ROOT_URL correctly, otherwise the web may not work correctly.