@Override
    public void run() {
        log.log(FINE, "Rpc server will listen on port " + spec.port());
        try {
            Acceptor acceptor = supervisor.listen(spec);
            isRunning = true;
            supervisor.transport().join();
            acceptor.shutdown().join();
        } catch (ListenFailedException e) {
            stop();
            throw new RuntimeException("Could not listen at " + spec, e);
        }
    }
Returns a String with statistics data for the server.

@param req a Request
configserver/src/main/java/com/yahoo/vespa/config/server/rpc/RpcServer.java