Your ROOT_URL in app.ini is https://src.whiteboxsystems.nl/ but you are visiting http://src.whiteboxsystems.nl/Whitebox/u-boot/blame/commit/115d60c0cf5a9f72d738b3db012e9d855979b621/configs/Ampe_A76_defconfig
You should set ROOT_URL correctly, otherwise the web may not work correctly.