Your ROOT_URL in app.ini is https://src.whiteboxsystems.nl/ but you are visiting http://src.whiteboxsystems.nl/Whitebox/u-boot/blame/commit/0532ceef30b735fe24c0cb4f77fb1717bd55c7ee/configs/inet_q972_defconfig
You should set ROOT_URL correctly, otherwise the web may not work correctly.