Your ROOT_URL in app.ini is https://src.whiteboxsystems.nl/ but you are visiting http://src.whiteboxsystems.nl/Whitebox/u-boot/commits/commit/5d97fe2a0421247f6b89591c666d7aa94d40beb0/board/hidden_dragon/README
You should set ROOT_URL correctly, otherwise the web may not work correctly.