<p>I have apache web server installed as frontend and I have j2ee SAP Netweaver Application Server installed in Intranet server. How can I configure apache to forward requests and response to/from j2ee app server.
for example, external apache server's ip is 9.20.1.1:80. 
internal sap server's address is 192.168.0.1/sap/bc/gui/sap/its/webgui?sap_client=200
I want access to my sap app server for example 9.20.1.1/sapserver/sap/bc/gui/sap/its/webgui?sap_client=200</p>

Assuming you have mod_proxy enabled, add to you're sites-available:
```
```
ProxyRequests Off
   <Location "/sapserver">
        ProxyPass http://192.168.0.1
        ProxyPassReverse http://192.168.0.1
   </Location>
```
```
Be careful though as this does expose your internal site to the entire internet.