protocolHeader field does not have a default value while it often talks about "X-Forwarded-Proto" and this is very popuplar one, like "X-Forwarded-By" or X-Forwaded-For". We should set it as default value to reduce use configuration for most cases.
Fixed in: - master for 9.0.18 onwards - 8.5.x for 8.5.40 onwards - 7.0.x for 7.0.94 onwards