请求响应包含三个大写输入字符串，并标志着请求处理过程的结束。
A request Response contains the three upper-cased input strings and represents the completion of the request processing.
任何现有的处理过程将会继续，使用打开的日志文件直到正常完成，而任何新的请求将会记录到使用旧的名称创建的新日志文件中。
Any existing processing continues until normal completion using the open log file, and any new requests will be logged to a new log file created using the old name.
与IIS一样，ASP.NET引擎在请求的有效期内将会触发事件，通过发信号来表示其处理过程从一个状态改变为了另一个状态。
Like IIS, during the lifetime of a request the ASP.NET engine fires events signaling its change from one state of processing to another.
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