how to set and forward $ssl_client_fingerprint to backend

[cloudsense]

Hi All,

How do I set and forward $ssl_client_fingerprint via nginx to the backend ?

on the _post/site.conf , i tried

proxy_set_header X-SSL-Client-Fingerprint $ssl_client_fingerprint; 
Also tried  $http_ssl_ja3_hash  and $http_ssl_ja3 but none seem to be set.

Also set ssl-client-verify to be on , but it does not set the header.

Thanks