Your ROOT_URL in app.ini is https://source.parasitstudio.de:63000/ but you are visiting https://source.parasitstudio.de/wirtz/Teensy-reSID/src/commit/6b5d9e46092a9760bcca8a42dc8704ccac536921/examples/SDCARD/OtherSIDe.dmp
You should set ROOT_URL correctly, otherwise the web may not work correctly.