Your ROOT_URL in app.ini is https://source.parasitstudio.de:63000/ but you are visiting https://source.parasitstudio.de/wirtz/MicroDexed/commits/commit/82d9de535e908374d47de8a3985d20242d054f0b/addon/SD/PERFORMANCE/1/drums.json You should set ROOT_URL correctly, otherwise the web may not work correctly.