Your ROOT_URL in app.ini is https://source.parasitstudio.de:63000/ but you are visiting https://source.parasitstudio.de/wirtz/MicroDexed/src/commit/1938e987a531143cf81dcab4ab6d054092514e9f/third-party/ArduinoJson/extras/tests/FailingBuilds You should set ROOT_URL correctly, otherwise the web may not work correctly.