Your ROOT_URL in app.ini is https://src.whiteboxsystems.nl/ but you are visiting http://src.whiteboxsystems.nl/Whitebox/u-boot/blame/commit/b880fcf02128401c823f2a42aca6ae52df5f8625/configs/T1040QDS_SECURE_BOOT_defconfig
You should set ROOT_URL correctly, otherwise the web may not work correctly.