Your ROOT_URL in app.ini is https://src.whiteboxsystems.nl/ but you are visiting http://src.whiteboxsystems.nl/Whitebox/u-boot/src/commit/4245701ef58c9c7c1dbccc8fa2f1bdd248b97b8b/configs/woodburn_defconfig
You should set ROOT_URL correctly, otherwise the web may not work correctly.