In Mvc App Static File Cache Content

Question

Following Code Not Workin in Wbe Config  

 

<staticContent>

<clientCache httpExpires="Sun, 29 Mar 2020 00:00:00 GMT" cacheControlMode="UseExpires" />

</staticContent>

 

When I am Checking Site Performance in GtMetrix.com  It shows Css and js Cache header expire not mention error