Your ROOT_URL in app.ini is https://src.whiteboxsystems.nl/ but you are visiting http://src.whiteboxsystems.nl/Whitebox/u-boot/blame/commit/f6a4093ba062b427b79dc0aca39e47846175908e/configs/T1024QDS_SDCARD_defconfig
You should set ROOT_URL correctly, otherwise the web may not work correctly.