Your ROOT_URL in app.ini is https://src.whiteboxsystems.nl/ but you are visiting http://src.whiteboxsystems.nl/Whitebox/u-boot/src/commit/7a170a59f3b512ccd1d3ce51a1814b60fd1ec7bc/configs/MPC8548CDS_defconfig
You should set ROOT_URL correctly, otherwise the web may not work correctly.