默认情况下，varnishd既不缓存带有cookie的响应，也不遵守cache - Control指令private和no - cache。

Out of the box, varnishd does not cache a response with a cookie, nor does it honor the Cache-Control directives private and no-cache.

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设置特定配置从缓存中清除的不活动时间(以秒为单位)，默认值为3600(1小时)。

Specifies time of inactivity (in seconds) when particular configuration will be purged from cache. The default value is 3600 (1 hour).

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