Your ROOT_URL in app.ini is https://source.parasitstudio.de:63000/ but you are visiting https://source.parasitstudio.de/wirtz/esp-link/commits/commit/4a8d318d850166c70689ed38fef0158faaf1fbd4/espfs/mkespfsimage/main.c You should set ROOT_URL correctly, otherwise the web may not work correctly.