I am using YSlow to grade the performance of my application and I got an D grade for the Add Expires Header aspect.
I am using IIS express, so I found this code online and added it into the web.config file but it doesnt work; the grade is still D.
I did it in the web.config file. Any idea how to improve the grade of "Add Expires Header" ?
<system.webServer> <staticContent> <clientCache cacheControlMaxAge="30.00:00:00" cacheControlMode="UseMaxAge"/> </staticContent>