在将每个消息实际发送到服务提供程序之前，中介会对此进行记录。
Before each message is actually sent to the service provider, the mediation logs it.
应用程序和服务应该写入应用程序记录档或自订记录档。
Applications and services should write to the Application log or a custom log.
应用程序和服务应该写入应用程序记录档或自订记录档。
Applications and services should write to the Application log or a custom log.
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