http://www.perlmonks.org?node_id=500482

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---

 ########################
    # Reverse proxy stuff 
    ProxyRequests    off
    ProxyPreserveHost On
    ProxyPass        /kb/ http://127.0.0.1/kb/

    CacheEnable disk /kb
    CacheRoot "/var/cache/mod_proxy"
    CacheDefaultExpire      900
    CacheIgnoreNoLastMod    On
    CacheIgnoreCacheControl On
    CacheStorePrivate       On
    CacheMaxExpire          900
    <Location /kb>
         Header set Cache-Control "max-age=900"
    </Location>

    ExpiresActive                               On
    #ExpiresByType text/html                    "access plus 5 minutes
+"
    ExpiresByType image/gif                     "access plus 1 day"
    ExpiresByType image/jpeg                    "access plus 1 day"
    ExpiresByType image/png                     "access plus 1 day"
    ExpiresByType text/css                      "access plus 1 day"
    ExpiresByType application/x-javascript      "access plus 1 day"
[download]

And on the backend server

 RewriteEngine On
    RewriteRule ^(/kb/general)/(search)/$                   $1/index.p
+hp?View=$2&                   [QSA]
    RewriteRule ^(/kb/general)/(rssfeed|glossary)/$         $1/index.p
+hp?View=$2
    RewriteRule ^(/kb/general)/([0-9][0-9]*)/$              $1/index.p
+hp?CategoryID=$2
    RewriteRule ^(/kb/general)/(entry)/([0-9][0-9]*)/$      $1/index.p
+hp?View=$2&EntryID=$3
    RewriteRule ^(/kb/general)/(print)/([0-9][0-9]*)/$      $1/index.p
+hp?View=$2&EntryID=$3
[download]