Enable Reverse Proxy on Apache

<VirtualHost *:80>
ProxyRequests Off
ProxyPass /blog http://blog.my-helper.com
ProxyPassReverse /blog http://blog.my-helper.com
…
</VirtualHost>

When users visit http://www.my-helper.com/blog, server will display the content of http://blog.my-helper.com.

Remark: Need to enable apache module mod_proxy and mox_proxy_http first.