SVN through Pound

You need to have xHTTP 3 in the Listen section of the pound.cfg

ListenHTTPS
    Address 1.2.3.4
    Port 443
    xHTTP 3
    Cert "/usr/local/sbin/todo.pem"
    Service
        BackEnd
            Address a.a.com
            Port    9090
        End
    End
End