Cache configuration ASP.NET

Question

I am trying to understand the cache configuration below:

<!--Configures expiration for files in CMS/VPP-->
<staticFile expirationTime="12:0:0" />

<!--Configures expiration in IIS-->
<system.webServer>
   <!--Configures client headers for static files from IIS-->
   <staticContent>
       <clientCache cacheControlMode="UseMaxAge" cacheControlMaxAge="1.00:00:00"></clientCache>
   </staticContent>
   <!--Configures output and kernel caching for ALL images (both CMS and IIS)-->
   <caching>
      <profiles>
        <add extension=".gif" policy="CacheUntilChange" kernelCachePolicy="CacheUntilChange" duration="0.00:01:00" location="Any" />
        <add extension=".png" policy="CacheUntilChange" kernelCachePolicy="CacheUntilChange" duration="0.00:01:00" location="Any" />
        <add extension=".js" policy="CacheUntilChange" kernelCachePolicy="CacheUntilChange" duration="0.00:01:00" location="Any" />
        <add extension=".css" policy="CacheUntilChange" kernelCachePolicy="CacheUntilChange" duration="0.00:01:00" location="Any" />
        <add extension=".jpg" policy="CacheUntilChange" kernelCachePolicy="CacheUntilChange" duration="0.00:01:00" location="Any" />
        <add extension=".jpeg" policy="CacheUntilChange" kernelCachePolicy="CacheUntilChange" duration="0.00:01:00" location="Any" />
      </profiles>
   </caching>
</system.webServer>
</configuration>

So the static files will be cached for 1 day as the cacheControlMaxAge="1.00:00:00". But I am confused as to why we have:

<staticFile expirationTime="12:0:0" />

And also the mime types have an expiration of 1 minute:

<caching>
      <profiles>
        <add extension=".gif" policy="CacheUntilChange" kernelCachePolicy="CacheUntilChange" duration="0.00:01:00" location="Any" />
        <add extension=".png" policy="CacheUntilChange" kernelCachePolicy="CacheUntilChange" duration="0.00:01:00" location="Any" />
        <add extension=".js" policy="CacheUntilChange" kernelCachePolicy="CacheUntilChange" duration="0.00:01:00" location="Any" />
        <add extension=".css" policy="CacheUntilChange" kernelCachePolicy="CacheUntilChange" duration="0.00:01:00" location="Any" />
        <add extension=".jpg" policy="CacheUntilChange" kernelCachePolicy="CacheUntilChange" duration="0.00:01:00" location="Any" />
        <add extension=".jpeg" policy="CacheUntilChange" kernelCachePolicy="CacheUntilChange" duration="0.00:01:00" location="Any" />
      </profiles>
   </caching>

So does it mean that all static content is cached for 1 day or is it specific to the settings? Like any files other than the mime types is 1 day and the mime types are 1 minute.

Sam Rueby · Accepted Answer · 2019-01-17 00:19:18Z

1

<staticFile> is non-standard. That appears to be a configuration element for EPiServer.Web.StaticFileHandler. <system.webServer> is configuring IIS. Which configuration is used depends on what module is handling the request.

The documentation over at https://learn.microsoft.com is pretty good: https://learn.microsoft.com/en-us/iis/configuration/system.webserver/staticcontent/clientcache

Besides this I would say there's no better way to find out what it does / what configuration matters than to give it a try. On most browsers you can press F12 and open the developer tools. Make a request to the static files and look at the Network tab. Read the response headers, such as Cache-Control, Last-Modified, etc.

answered Jan 17, 2019 at 0:19

Sam Rueby

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