Your ROOT_URL in app.ini is https://src.whiteboxsystems.nl/ but you are visiting http://src.whiteboxsystems.nl/Whitebox/u-boot/blame/commit/7a7d246d97bc66e01bf030b0503b14f78f08629d/configs/Cubietruck_defconfig
You should set ROOT_URL correctly, otherwise the web may not work correctly.