<VirtualHost *:80>
        ServerName www.freedom.pliantcode.com
        DirectoryIndex index.html
        DocumentRoot /pliant/sites/pliantcode.com/

        RewriteEngine On
        RewriteLogLevel 4
        RewriteLog /var/log/apache2/pliantcode-rewrite.log
        ProxyVia On
        ProxyRequests On

        RewriteMap   pliant_config prg:/path/to/pliant_config_server.pl
        RewriteMap   ui_path txt:/path/to/ui_path.txt

        # detect right proxy
        RewriteRule .* - [E=proxy:http://${pliant_config:proxy}]
        RewriteRule .* - [E=browser_key:http://${pliant_config:browser_key}]
        RewriteRule .* - [E=active_key:http://${pliant_config:active_key}]
        # cache detect:
        RewriteCond %{env:browser_key},,,%{HTTP_COOKIE}  !(.+?),,,.*SID=\1 [NC]
        RewriteCond %{env:active_key},,,%{HTTP_COOKIE}  !(.+?),,,.*SID=\1 [NC]
        RewriteCond %{env:active_key},%{QUERY_STRING} !(.+),sid=\1
        RewriteCond %{env:active_key},,,%{REQUEST_URI} !(.+),,,/_/.*\1
        RewriteCond %{QUERY_STRING} !^active 
        RewriteRule .* - [E=proxy:http://${pliant_config:cache_proxy|%{env:proxy}}]
        # cache forced:
        RewriteCond %{QUERY_STRING} ^inactive
        RewriteRule .* - [E=proxy:http://${pliant_config:cache_proxy|%{env:proxy}}]

        RewriteCond %{REQUEST_URI} ^/_/
        RewriteRule ^(.*)$ %{env:proxy}$1 [P,L,QSA]


        RewriteCond ${ui_path:%{REQUEST_URI}|undef} !^undef$
        RewriteRule ^(.*)$  %{env:proxy}/sites/pliantcode.com/${ui_path:$1} [P,L,QSA]

        Alias /lib/ /pliant/sites/common/lib/
        <Location />
          Order allow,deny
          Allow from all
        </Location>
        <Location /pub>
          Order allow,deny
          Allow from all
        </Location>
</VirtualHost>