Your ROOT_URL in app.ini is https://src.whiteboxsystems.nl/ but you are visiting http://src.whiteboxsystems.nl/Whitebox/u-boot/blame/commit/8ffb23cbf58c0a8f484f27a876d1d301dcbe117d/configs/tqma6s_mba6_spi_defconfig
You should set ROOT_URL correctly, otherwise the web may not work correctly.