IIS7 cacheControlMaxAge属性不起作用

Question

在IIS 7.5中,我将cacheControlMaxAge设置为一年

<location path="Content/Images">
    <system.webServer>
      <staticContent>
        <clientCache cacheControlCustom="public" cacheControlMode="UseMaxAge" cacheControlMaxAge="365.00:00:00" />
      </staticContent>
    </system.webServer>
  </location>

根据本指南:设置Expires和Cache-Control:ASP.NET中静态资源的max-age标头

但是,Google PageSpeed工具仍然说文件没有缓存:

The following cacheable resources have a short freshness lifetime. Specify an expiration at least one week in the future for the following resources:
* https://local.example.com/Content/Images/image1.png (expiration not specified)
(etc)

为什么说"未指定过期"？

整个webapp都通过https提供,这是一个因素吗？

Answer 1

我通过将指定的路径更改Content/Images为just 来解决这个问题Content

<location path="Content">
    <system.webServer>
      <staticContent>
        <clientCache cacheControlCustom="public" 
                     cacheControlMode="UseMaxAge" 
                     cacheControlMaxAge="365.00:00:00" />
      </staticContent>
    </system.webServer>
  </location>

所以它是固定的,但路径的改变并不能说明实际问题是什么.