如果服务不可用，则允许我们缓存同义词。
This allows us to cache our synonyms if the service is not available.
攻击会导致系统上产生大量套接字连接请求，最终导致服务不可用。
The attack eventually makes the service unavailable by establishing thousands of socket connection requests with the vulnerable system.
当本地服务不可用时，将请求透明地重路由到其他地方的服务提供者。
When a local service is unavailable, requests are transparently rerouted to a service provider elsewhere.
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