Can I get SSL_CLIENT_S_DN_CN within Rewrite Module?

Dear expert:

We are trying to get the SSL_CLIENT_S_DN_CN from client certificate
and put it into request as a quary string by using RewriteRule, but we could
not
rewrite it and always get empty quary string. The config is as following:

SSLOptions +StdEnvVars

RewriteEngine On
RewriteOptions inherit
RewriteLog logs/rewrite.log
RewriteLogLevel 9
#RewriteRule ^/esdi/pat$ /esdi/pat?SSL_CLIENT_S_DN_CN=%{SSL_CLIENT_S_DN_CN}
#RewriteCond %{HTTP_USER_AGENT} ^Mozilla.*
#RewriteCond %{ENV:SSL_CLIENT_S_DN_CN} ^(.*)$
RewriteCond %{ENV:SSL_CLIENT_S_DN_CN} (.*)
RewriteRule ^/esdi/pat$ - [E=ID:%1,C]
RewriteRule ^/esdi/pat$ /esdi/pat?pat-id=%{ENV:ID} [L]

Can I get environment varable like SSL_CLIENT_XXX within Rewrite Module, I
have no problem
to get %{SERVER_NAME} and rewrite it into quary string.

Is it correct? Hope to get your help soon. Thanks in advance!

Harry Yu

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