Your ROOT_URL in app.ini is https://src.whiteboxsystems.nl/ but you are visiting http://src.whiteboxsystems.nl/Whitebox/u-boot/commits/commit/df61a74e6845ec9bdcdd48d2aff5e9c2c6debeaa/include/linux_logo.h
You should set ROOT_URL correctly, otherwise the web may not work correctly.
wdenk