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在客户端节点中，每次发送请求时都要判断client_->wait_for_service这个函数么，还是说可以初始化等待一次，之后的请求可以不用加这个判断了。
@Zln4ever 都可以。如果你初始化时判断，能保证server没上线时不会发出请求；你请求时判断，能保证每次请求前server都在线
@Lorry 好的谢谢老哥