Your ROOT_URL in app.ini is https://source.parasitstudio.de:63000/ but you are visiting https://source.parasitstudio.de/wirtz/MicroDexed/src/commit/73abbcb75a7ab8a06682b27433a9388e8b74eaea/third-party/TeensyVariablePlayback/docs You should set ROOT_URL correctly, otherwise the web may not work correctly.