ProxyPreserveHost On
ProxyPass /solr4 http://localhost:8983/solr4

<LocationMatch /solr4/cn-audit/(admin|update|get|replication)>
    Order Deny,Allow
    Deny from all
    Allow from D1_CN_IP_1
    Allow from D1_CN_IP_2
    Allow from D1_CN_IP_3
</LocationMatch>