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title: Source
Source 是 [Envoy](/zh/docs/reference/glossary/#envoy) 代理的下游客户端。
在[服务网格](/zh/docs/reference/glossary/#service-mesh)里，source 通常是一个[工作负载](/zh/docs/reference/glossary/#workload)，但是入口流量的 source 有可能包含其他客户端，例如浏览器，或者一个移动应用。