How to Set an expiry date or a maximum age in the HTTP headers, by using ” Expires” and “Last-Modified” for all cacheable static resources, include JS and CSS files, image files, and other binary object files to instructs the browser to load previously downloaded resources from local disk rather than over the network.
Try to install this plugin: W3 Total Cache and look for the Browser Cache. Enable “Set expires header” and set the time for “Expires header lifetime”. I think other things you need are packaged on that plugin. Hope this helps. :)
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