Your ROOT_URL in app.ini is https://src.whiteboxsystems.nl/ but you are visiting http://src.whiteboxsystems.nl/Whitebox/u-boot/src/commit/9a5d993e657d73820eb3aa0543cee4c3531f5ba1/include/spd_sdram.h
You should set ROOT_URL correctly, otherwise the web may not work correctly.