Your ROOT_URL in app.ini is https://source.parasitstudio.de:63000/ but you are visiting https://source.parasitstudio.de/wirtz/esp-link/src/commit/bc3856334d7f596d3aa433f69d8c6a8cc4b30c2e/mqtt You should set ROOT_URL correctly, otherwise the web may not work correctly.

Benjamin Runnels bc3856334d Made some modules optional		10 years ago
..
mqtt.c	mergeing mqtt into master	10 years ago
mqtt.h	Made some modules optional	10 years ago
mqtt_cmd.c	Made some modules optional	10 years ago
mqtt_cmd.h	Made some modules optional	10 years ago
mqtt_msg.c	mergeing mqtt into master	10 years ago
mqtt_msg.h	mergeing mqtt into master	10 years ago
proto.c	mergeing mqtt into master	10 years ago
proto.h	mergeing mqtt into master	10 years ago
queue.c	mergeing mqtt into master	10 years ago
queue.h	mergeing mqtt into master	10 years ago
ringbuf.c	mergeing mqtt into master	10 years ago
ringbuf.h	mergeing mqtt into master	10 years ago