Your ROOT_URL in app.ini is https://src.whiteboxsystems.nl/ but you are visiting http://src.whiteboxsystems.nl/Whitebox/u-boot/src/commit/111396ccb9a8d3e1f0e9d9921d3dbd6c7a70423f/configs/sbc8548_PCI_33_defconfig
You should set ROOT_URL correctly, otherwise the web may not work correctly.