Your ROOT_URL in app.ini is https://source.parasitstudio.de:63000/ but you are visiting https://source.parasitstudio.de/wirtz/MicroDexed/src/commit/b7ba5ead45fc0ea8a6881d24e46e82d356c3b253/third-party/ArduinoJson/extras/tests/JsonSerializer You should set ROOT_URL correctly, otherwise the web may not work correctly.