ProxyRequests Off
ProxyVia full

ProxyPass /proxied-dir/ http://internal.site/
ProxyPassReverse /proxied-dir/ http://internal.site/
ProxyHTMLURLMap http://internal.site /proxied-dir

<Proxy *>
    Order deny,allow
    Allow from all
</Proxy>

<Location /proxied-dir/>
    ProxyPassReverse /
    SetOutputFilter INFLATE;proxy-html;DEFLATE
    #ProxyHTMLEnable On
    ProxyHTMLUrlMap / /proxied-dir/
    RequestHeader   unset   Accept-Encoding
</Location>