How to configure static content cache per folder and extension in IIS7?
caching, http-headers, iis, iis-7, web-config
Solution
You can set specific cache-headers for a whole folder in either your root `web.config`:
<?xml version="1.0" encoding="UTF-8"?>
<configuration>
<!-- Note the use of the 'location' tag to specify which
folder this applies to-->
<location path="images">
<system.webServer>
<staticContent>
<clientCache cacheControlMode="UseMaxAge" cacheControlMaxAge="00:00:15" />
</staticContent>
</system.webServer>
</location>
</configuration>
Or you can specify these in a `web.config` file in the content folder:
<?xml version="1.0" encoding="UTF-8"?>
<configuration>
<system.webServer>
<staticContent>
<clientCache cacheControlMode="UseMaxAge" cacheControlMaxAge="00:00:15" />
</staticContent>
</system.webServer>
</configuration>
I'm not aware of a built in mechanism to target specific file types.
Problem
I would like to set up rules in IIS7 for static content caching in my ASP.NET website. I have seen these articles, which details how to do it using the `<clientCache />` element in `web.config`: Client Cache `<clientCache>` (IIS.NET) Add Expires or Cache Control Header to static content in IIS (Stack Overflow) However, this setting appears to apply globally to all static content. Is there a way to do this just for certain directories or extensions? For example, I may have two directories which need separate cache settings: `/static/images` `/content/pdfs` Is it possible to set up rules for sending cache headers (`max-age`, `expires`, etc) based on extensions and folder paths? Please note, I must be able to do this via `web.config` because I don't have access to the IIS console.