Adding expire headers for static content

Static content from a site can put unnecessary load when rendering content. Assets such as images, scripts and styles can be cached using an expire header to stop them from being requested on each HTTP request.

It would be wise to add a version number or date of the change to the end of each static item to allow the cache to be updated when new assets are added. For example

.png?v=1 or .css?v=01012017 .js?v=1

The cache can then be called either through setting a Common HTTP Response Headeror through code

Response.Cache.SetExpires(DateTime.Now.AddYears(1));
Response.Cache.SetCacheability(HttpCacheability.Public);

or by add the following code to your web.config

 <system.webServer>
 <staticContent>
 <clientCache cacheControlCustom="public" cacheControlMaxAge="12:00:00" cacheControlMode="UseMaxAge"/>
 </staticContent>
 </system.webServer>
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