如果应用程序要求整个通信是安全的，则您将使用SSL。
If the application requires that the whole communication be secure, you'll use SSL.
要编写分布式应用，程序员必须学习和使用针对跨层通信、数据编制、同步和安全等领域的底层类库。
To write distributed applications, programmers must learn and use a large variety of lower-level libraries for cross-tier communication, data marshaling, synchronization, and security.
像通信协议差异、路由和审核交互、安全性之类的内容可以在实际的服务请求程序和提供程序之外处理。
Things like communication protocol differences, routing and auditing of interactions, security, and so on, can be handled outside of the actual service requester and provider.
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