活动线程的平均数是到达容器的当前请求数的标准。
The average number of active threads is a gauge for the number of concurrent requests reaching the container.
page对象是处理当前请求的servlet类实例。
The page object is the instance of the servlet class processing the current request.
总的原则是，仅计算和检索对于当前请求和响应有直接意义的信息。
The general rule is to only compute and retrieve those pieces of information that have direct significance for the current request and response.
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