Your ROOT_URL in app.ini is https://src.whiteboxsystems.nl/ but you are visiting http://src.whiteboxsystems.nl/Whitebox/u-boot/blame/commit/83fbebf21986570a5c204c9ed751fdf89a8efc3d/configs/T1042D4RDB_SECURE_BOOT_defconfig
You should set ROOT_URL correctly, otherwise the web may not work correctly.