我有来自YSlow的报告:
(no expires) http://static3.scirra.net/avatars/128/40cfdcbd1b1ec1842e199c97c4b85a4a.png
还有许多类似的情况。但是在我的web.config文件中:
<system.webServer>
<staticContent>
<clientCache httpExpires="Sun, 29 Mar 2020 00:00:00 GMT" cacheControlMode="UseExpires" />
</staticContent>
<caching>
<profiles>
<add extension=".ashx" policy="CacheForTimePeriod" kernelCachePolicy="DontCache" duration="01:00:00" />
<add extension=".png" policy="CacheUntilChange" kernelCachePolicy="CacheUntilChange" location="Any" />
</profiles>
</caching>
<rewrite>
<rules>
<rule name="Avatar">
<match url="avatars/([0-9]+)/(.*).png" />
<action type="Rewrite" url="gravatar.ashx?hash={R:2}&size={R:1}" appendQueryString="false" />
</rule>
</rules>
</rewrite>
这不应该正确地添加到期标头吗? 我的目标是:
- Gravatar.ashx从Gravatar服务器获取图像
- 服务器缓存结果1小时(类似于SO)
- 添加到期标头,以便客户端不会一直从我的服务器获取它