Your ROOT_URL in app.ini is https://src.whiteboxsystems.nl/ but you are visiting http://src.whiteboxsystems.nl/Whitebox/u-boot/blame/commit/d3662dff78e94d8d836fc61b84ce46fef91b9aa7/configs/T1023RDB_SPIFLASH_defconfig
You should set ROOT_URL correctly, otherwise the web may not work correctly.