Your ROOT_URL in app.ini is https://src.whiteboxsystems.nl/ but you are visiting http://src.whiteboxsystems.nl/Whitebox/u-boot/blame/commit/3146f0c017df2231d03dff09cee31f7bd63db3e5/configs/novena_defconfig
You should set ROOT_URL correctly, otherwise the web may not work correctly.