Your ROOT_URL in app.ini is https://src.whiteboxsystems.nl/ but you are visiting http://src.whiteboxsystems.nl/Whitebox/u-boot/src/commit/0fc52948bda0734431cb528ee4fd82f1dec8c7b5/include/asm-microblaze/processor.h
You should set ROOT_URL correctly, otherwise the web may not work correctly.