Rewrite rule help in apache 2.

We are using dynamic virtual hosting for a number of domains. The original request was to be able to go to http://somedomain.com/dav and update a webpage. This worked great. But now we would like to do this with dav over ssl. We don't want to buy an ssl certificate for every domain, so I would like to do a redirect from the virtual host to the ssl host. I can not do a Redirect /dav https://sslhost.com/davvhosts/%O as Redirect can not handle the %O.

So I would like to do a Rewrite on the ssl server based on the HTTP_REFERER variable, but I can't get it to work:



The Virtual host stuff:

<VirtualHost *>
  UseCanonicalName Off
  CustomLog logs/access_log vcommon
  VirtualDocumentRoot /web/vhosts/%0/htdocs
  VirtualScriptAlias /web/vhosts/%0/cgi-bin
  <Directory />
    Options FollowSymLinks ExecCGI Multiviews Includes
    AllowOverride All
  </Directory>
  <Location /tools/login>
    ForceType application/x-httpd-php
  </Location>
  Redirect /dav https://www.sightworks.net/davvhosts
</VirtualHost>

Then in the SSL side I tried a couple things. First just modifying the HTTP_REFERER variable:

RewriteEngine On
RewriteMap lowercase int:tolower
RewriteCond %{HTTP_REFERER} /dav/
RewriteRule ^http://(.*)/dav/ $1
RewriteCond %{REQUEST_URI} !^/icons/
RewriteCond %{REQUEST_URI} !^/cgi-bin/
RewriteCond %{REQUEST_URI} ^/davvhosts/
RewriteRule ^/(.*)$ /www/vhosts/${lowercase:%{HTTP_REFERER}}/$1
RewriteCond %{REQUEST_URI} ^/cgi-bin/
RewriteRule ^/(.*)$ /www/vhosts/${lowercase:%{HTTP_REFERER}}/cgi-bin/$1 [T=application/x-httpd-cgi]
RewriteCond %{REQUEST_URI} !^/icons/
RewriteCond %{REQUEST_URI} !^/cgi-bin/
RewriteCond %{REQUEST_URI} ^/davhosts/
RewriteRule ^/(.*)$ /www/hosts/${lowercase:%{HTTP_REFERER}}/$1
RewriteCond %{REQUEST_URI} ^/cgi-bin/

I also tried just setting a different variable and using it, but that did not work either:
RewriteEngine On
RewriteMap lowercase int:tolower
RewriteCond %{HTTP_REFERER} /dav/
RewriteRule ^http://(.*)/dav/ - [E=HTTP_REFERER_HOST:$1]
RewriteCond %{REQUEST_URI} !^/icons/
RewriteCond %{REQUEST_URI} !^/cgi-bin/
RewriteCond %{REQUEST_URI} ^/davvhosts/
RewriteRule ^/(.*)$ /www/vhosts/${lowercase:%{HTTP_REFERER_HOST}}/$1
RewriteCond %{REQUEST_URI} ^/cgi-bin/
RewriteRule ^/(.*)$ /www/vhosts/${lowercase:%{HTTP_REFERER_HOST}}/cgi-bin/$1 [T=application/x-httpd-cgi]
RewriteCond %{REQUEST_URI} !^/icons/
RewriteCond %{REQUEST_URI} !^/cgi-bin/
RewriteCond %{REQUEST_URI} ^/davhosts/
RewriteRule ^/(.*)$ /www/hosts/${lowercase:%{HTTP_REFERER_HOST}}/$1
RewriteCond %{REQUEST_URI} ^/cgi-bin/


In both cases it looks like the variable being set ends up blank.

Is what I want to do possible? If so, what am I doing wrong?



CANCEL THAT QUESTION! I figured out the answer:

  RewriteEngine on
  RewriteLog    /web/etc/httpd/logs/rewrite.log
  RewriteCond   %{REQUEST_URI}  ^/dav$  [OR]
  RewriteCond   %{REQUEST_URI}  ^/dav/
  RewriteCond   %{HTTP_HOST}    !^[0-9]+\.[0-9]+\.[0-9]+\.[0-9]+$
  RewriteRule   ^/dav.*$                https://www.sslhost.net/davvhosts/%{HTTP_HOST}/      [R,L]