private void dispatchRpcRequest(Request request, Runnable handler) {
        request.detach();
        log.log(Level.FINEST, () -> String.format("Dispatching RPC request %s", requestLogId(request)));
        rpcExecutor.execute(() -> {
            try {
                log.log(Level.FINEST, () -> String.format("Executing RPC request %s.", requestLogId(request)));
                handler.run();
            } catch (Exception e) {
                log.log(Level.WARNING,
                        String.format("Exception thrown during execution of RPC request %s: %s", requestLogId(request), e.getMessage()), e);
            }
        });
    }
Returns 0 if server is alive.

@param req a Request
config-proxy/src/main/java/com/yahoo/vespa/config/proxy/ConfigProxyRpcServer.java