Your ROOT_URL in app.ini is https://src.whiteboxsystems.nl/ but you are visiting http://src.whiteboxsystems.nl/Whitebox/u-boot/src/commit/16185a85d9aa839a1d4b596561b9e8271f436795/configs/rsk7269_defconfig
You should set ROOT_URL correctly, otherwise the web may not work correctly.