Your ROOT_URL in app.ini is https://src.whiteboxsystems.nl/ but you are visiting http://src.whiteboxsystems.nl/Whitebox/u-boot/blame/commit/fda4eb48e60b0ea5a575ed7bc0b853fc6db2da29/configs/uniphier_sld3_defconfig
You should set ROOT_URL correctly, otherwise the web may not work correctly.