The flow described above principally provides a mechanism for reliable messaging: a client sends a logging request and the server sends an acknowledgement once it has persisted the message.
上面的流程整体上提供了一种可靠消息传递机制：一个客户端发送一条日志请求，服务器在完成消息存储之后发送一条确认信息。
The proxy server listens on the same protocol as the remote server, but when it gets a request it simply performs the necessary action, such as logging the request.
代理服务器监听和远程服务器相同的协议，但是在收到请求时仅仅执行必要的活动，比如记录请求。
A client sends logging request to server.
客户端对服务器发出日志请求。
A client sends logging request to server.
客户端对服务器发出日志请求。
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