Your ROOT_URL in app.ini is https://src.whiteboxsystems.nl/ but you are visiting http://src.whiteboxsystems.nl/Whitebox/u-boot/src/commit/b4e78faab3ce31543ca59a97f8d7d19d66ac608b/board/miromico/hammerhead/Makefile
You should set ROOT_URL correctly, otherwise the web may not work correctly.