Fill in the details of your cache server as shown below
At present there is no GUI available for configuring proxies, and ResEdit or similar must be used
Edit STR# resource number 803
Strings are of the form: protocol;http_proxy_url, e.g.
http;http://wwwcache.lnf.infn.it:8080/ gopher;http://wwwcache.lnf.infn.it:8080/ ftp;http://wwwcache.lnf.infn.it:8080/ wais;No proxy is also supported - edit STR# resource 804, e.g.
*.lnf.infn.it
All incarnations of Netscape are configured for caching in the same way