Mutual Authentication of SSL cert

Hi,
I’ve been casting around looking at being able to validate the above. I can see an open request(https://github.com/Kong/kong/issues/2048) that is more than a year old but seems to have died. Does anyone know if this has moved forward at all? From what I can see it may be possible at the NGINX level but I’ll have to dig deeper into that. Or is there something I’ve missed?

Thanks