How can I configure Forward proxy from apache on linux

Question

I'm trying to configuring forward proxy my Apache Server on linux. Apache Server ver.2.4.8

I'm tried coneect to 'http://example.com'. but, Response Code is 500. I think Path and Query string not be contained on my proxy request. What is Problem?

My configuration is

<VirtualHost *:80>
    ServerAdmin [email protected]
    ServerName example.com
    ErrorLog "logs/error.log"
    CustomLog "logs/access.log"

    ProxyRequests On
    ProxyPreserveHost Off

    <Location /outbound/server>
        ProxyPass <http://example.com>/outbound/server
        ProxyPassReverse http://example.com/outbound/server
    </Location>

</VirtualHost>