Your ROOT_URL in app.ini is https://source.parasitstudio.de:63000/ but you are visiting https://source.parasitstudio.de/wirtz/esp-link/blame/commit/36672200b59883cb2dd92b8c05f5a2fdd811f6b1/html/web-server.html
You should set ROOT_URL correctly, otherwise the web may not work correctly.