Your ROOT_URL in app.ini is https://source.parasitstudio.de:63000/ but you are visiting https://source.parasitstudio.de/wirtz/MicroDexed/src/commit/4b7e51c10075720e73916a57ae67fc2764214cec/third-party/TeensyVariablePlayback/examples/sd_raw You should set ROOT_URL correctly, otherwise the web may not work correctly.