How to redirect http to https on same server?

I'm trying to redirect users from http://vhost.mydomain.com to
https://vhost.mydomain.com using this RewriteRule:

   RewriteCond   %{SERVER_PORT}  !^443$
   RewriteRule ^/(.*)$ https://cj-mydomain.choicepoint.net/$1 [L,R]


This does not seem to work.  I have the following defined as a virtual
host, and the ssl.include is listed below that.  What do I need to do to
redirect http to https on the same server?

-Thanks


<IfDefine SSL>
    <VirtualHost 178.45.221.41:443>

        #See file below
        Include conf/conf.d/ssl.include

        ErrorLog  /usr/local/apache/logs/ssl_mydomain_error_log
        CustomLog /usr/local/apache/logs/ssl_mydomain_access_log combined

        <IfModule mod_proxy.c>
            ProxyRequests On

            ProxyPass        / http://vhost.mydomain.net:80/
            ProxyPassReverse / http://vhost.mydomain.net:80/
          

        </IfModule>

    </VirtualHost>
</IfDefine> 


###########################  ssl.include

SSLEngine on

SSLCipherSuite
ALL:!ADH:!EXPORT56:RC4+RSA:+HIGH:+MEDIUM:+LOW:+SSLv2:+EXP:+eNULL

SSLCertificateFile
/usr/local/apache-1.3.37/conf/ssl.crt/star_mydomain_net.crt

SSLCertificateKeyFile
/usr/local/apache-1.3.37/conf/ssl.key/star_mydomain_net.key

SSLCertificateChainFile /usr/local/apache-1.3.37/conf/ssl.crt/DigiCertCA.crt

<Files ~ "\.(cgi|shtml|phtml|php3|roc|rock?)$">
    SSLOptions +StdEnvVars
</Files>

SetEnvIf User-Agent ".*MSIE.*" \
         nokeepalive ssl-unclean-shutdown \
         downgrade-1.0 force-response-1.0

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