Your ROOT_URL in app.ini is https://src.whiteboxsystems.nl/ but you are visiting http://src.whiteboxsystems.nl/Whitebox/u-boot/blame/commit/a59a77f86318550168d5ceec36a7ca0add42d778/configs/e2220-1170_defconfig
You should set ROOT_URL correctly, otherwise the web may not work correctly.