Your ROOT_URL in app.ini is https://src.whiteboxsystems.nl/ but you are visiting http://src.whiteboxsystems.nl/Whitebox/u-boot/blame/commit/f8714372ed8e65f1b90b05d7bc0c2a05bc0a9e3d/configs/BSC9132QDS_SDCARD_DDRCLK100_SECURE_defconfig
You should set ROOT_URL correctly, otherwise the web may not work correctly.