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/dec1137abc5d866b5d5be9c3ec0503426d28b878/include You should set ROOT_URL correctly, otherwise the web may not work correctly.

Jeroen Domburg c4986a79a2 SDK 1.1.1 compatibility fixes		10 years ago
..
esp8266.h	Using one header file for esp8266 stuff	10 years ago
espmissingincludes.h	SDK 1.1.1 compatibility fixes	10 years ago
uart_hw.h	Renamed/split some files but forgot to add them	11 years ago
user_config.h	Ting, a webserver example - first commit	11 years ago