Your ROOT_URL in app.ini is https://src.whiteboxsystems.nl/ but you are visiting http://src.whiteboxsystems.nl/Whitebox/u-boot/blame/commit/5ec0003b19cbdf06ccd6941237cbc0d1c3468e2d/configs/O2MNT_O2M112_defconfig
You should set ROOT_URL correctly, otherwise the web may not work correctly.