Your ROOT_URL in app.ini is https://src.whiteboxsystems.nl/ but you are visiting http://src.whiteboxsystems.nl/Whitebox/u-boot/blame/commit/ce0c474a72a72efe83808473a3411986a564e86b/configs/colibri_t20_defconfig
You should set ROOT_URL correctly, otherwise the web may not work correctly.