my VH config
RewriteEngine on
RewriteLog /var/log/apache2/rewrite2.log
RewriteLogLevel 9
RewriteMap ispacemap txt:/etc/apache2/ispaces_conf/idoia.com_ispaces.map
RewriteRule ^/(.+)      ${ispacemap:$1}


In my map
ixa    ispace/ixa


Whith http://idoia.com/, the server ouput a BAD REQUEST