Your ROOT_URL in app.ini is https://src.whiteboxsystems.nl/ but you are visiting http://src.whiteboxsystems.nl/Whitebox/u-boot/blame/commit/4ac96345b22cc8dcd299c6012cc5c80e44058bae/configs/am3517_evm_defconfig
You should set ROOT_URL correctly, otherwise the web may not work correctly.