File-based basic authentication (performed by mod_auth) is best done
on the frontend server. Only authentication implemented by mod_perl
handlers, such as Apache::AuthenDBI, should be
performed on the backend server. mod_proxy will proxy all
authentication headers back and forth, making the frontend Apache
server unaware of the authentication process.
|12.10. Frontend/Backend Proxying with Virtual Hosts||12.12. When One Machine Is Not Enough for Your RDBMS DataBase and mod_perl|