Although Web Proxy Server 4.0 works in both forward and reverse proxy modes, the Web Proxy Server 4.0 agent supports a Web Proxy Server 4.0 instance in reverse proxy mode only. You can configure Web Proxy Server 4.0 in reverse proxy mode using either of these methods:
Mapping requires defining regular and reverse mappings.
Virtual multi-hosting allows the reverse proxy server to respond to multiple DNS aliases as if a different server was installed in each of the addresses.
Choose one of these methods, depending on the requirements of your deployment. For the specific configuration steps required for each method, see the Sun Java System Web Proxy Server 4.0.10 Administration Guide.