Reverse Proxy and header manipulation

[Tomer Okavi <tomerok@xxxxxxxxx>]

Hi
I'm using apache as front end for iis servers.
I'm using mod_proxy and mod_proxy_balancer for the reverse proxy stuff and for load balancing requests beetween backend (IIS) servers.
the front end apache is also doing ssl, backend communication is http (browser ----> https apache ------> http backend iis)
i'm trying to pass some env variables like SSL_SESSION_ID to the backend servers via HTTP Headers.
i tried  RequestHeader append SSL_SESSION_ID %{SSL_SESSION_ID}e with no luck.
headers are set but with null values at the backend.

any help or pointers will be appreciated.

Thanks

Tomer.