Your ROOT_URL in app.ini is https://src.whiteboxsystems.nl/ but you are visiting http://src.whiteboxsystems.nl/Whitebox/u-boot/src/commit/f3b267b3a229e328bf765ffbb8cb2af382bbfa63/configs/MPC8548CDS_defconfig
You should set ROOT_URL correctly, otherwise the web may not work correctly.