ssl offloading and send-proxy-v2-ssl

[Arnall]

Hi everyone,

i'm using a nbproc > 1 configuration for ssl offloading :
listen web_tls
    mode http
    bind *:443 ssl crt whatever.pem process 2
    bind *:443 ssl crt whatever.pem process 3

../..
    server web_plain u...@plain.sock send-proxy-v2-ssl

frontend web_plain
    bind    *:80 process 1
    bind     u...@plain.sock process 1 accept-proxy

../..

And i'm looking for a secure solution in the web_plain frontend to know 
if the request come from web_tls or not ( in fact i want to know if the 
connection was initially made via SSL/TLS transport ).

I though that send-proxy-v2-ssl could help but i have no idea how ... 
src and src_port are OK with the proxy protocol but ssl_fc in web_plain 
keeps answering false  ( 0 ) even the request come from web_tls.

I could set and forward a secret header set in web_tls but i don't like 
the idea ... (have to change the header each time an admin sys leave the 
enterprise... )

Thanks.