Your ROOT_URL in app.ini is https://source.parasitstudio.de:63000/ but you are visiting https://source.parasitstudio.de/wirtz/MicroDexed/src/commit/c76ff12729a351838624400064d9ae1f2e014563/third-party/ArduinoJson/extras/tests/Numbers You should set ROOT_URL correctly, otherwise the web may not work correctly.