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/fae07a86a80a22c029a6dfcace1b22a4851989a1/include/esp8266.h
You should set ROOT_URL correctly, otherwise the web may not work correctly.